Washing machine

Abstract

This washing machine includes: a washing tub which is provided to wash laundry by using carbon dioxide and includes a first opening and a second opening; a distillation tank provided to accommodate foreign substances and carbon dioxide discharged from the washing tub and vaporize the carbon dioxide therein; a pump provided to move liquid carbon dioxide or gaseous carbon dioxide; a chiller disposed at one side of a fluid channel through which carbon dioxide flows and provided to lower a temperature of the carbon dioxide flowing through the fluid channel; and a first fluid channel connecting the second opening, the pump, the chiller, and the first opening so that the carbon dioxide in the washing tub is collected to the washing tub via the pump and the chiller.

Description

washing machine

[0001] The present disclosure relates to a washing machine.

[0002] Typically, washing machines are devices that use water as a detergent. Conversely, there are dry cleaning washing machines that use detergents, which are volatile organic compounds, instead of water to clean laundry without using water. Dry cleaning washing machines can use solvents, such as solvents or petroleum-based detergents.

[0003] Washing machines that use water pollute the environment by generating wastewater during the washing process, and solvent-based and petroleum-based cleaning solvents used in dry cleaning machines are harmful to the human body and can pollute the environment.

[0004] Carbon dioxide can be used as a replacement for the aforementioned cleaning solvents. Carbon dioxide has a lower viscosity than water, allowing it to easily penetrate fibers and remove contaminants. After washing, the carbon dioxide containing foreign substances can be vaporized to separate the carbon dioxide and the contaminants, and the vaporized carbon dioxide can be reused.

[0005] Carbon dioxide is a component of the general atmosphere, so it does not pollute the environment, and since liquid carbon dioxide is vaporized and liquefied and reused, carbon dioxide emissions are low, so it can also contribute to achieving carbon neutrality.

[0006] One aspect of the present disclosure provides a washing machine having a two-tank structure including a washing tank and a distillation tank and not including a separate carbon dioxide storage tank, wherein the temperature and pressure inside the washing tank can be controlled before a washing or rinsing step.

[0007] One aspect of the present disclosure provides a washing machine having a two-tank structure, which can control the temperature and pressure inside the washing tank as well as the distillation tank.

[0008] The technical problems to be achieved in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0009] According to one embodiment, a washing machine is provided to wash laundry using carbon dioxide, and includes a washing tub having a first opening and a second opening, a distillation tank configured to receive carbon dioxide and foreign substances discharged from the washing tub and vaporize carbon dioxide therein, a pump configured to move liquid carbon dioxide or gaseous carbon dioxide, a chiller disposed at one side of a passage through which carbon dioxide flows and configured to lower a temperature of carbon dioxide flowing through the passage, and a first passage connecting the second opening, the pump, the chiller, and the first opening so that carbon dioxide inside the washing tub is returned to the washing tub via the pump and the chiller.

[0010] According to one embodiment, a washing machine may include a washing tub having a first opening and a second opening, a pump configured to move liquid carbon dioxide or gaseous carbon dioxide, a chiller, and a first flow path connecting the second opening, the pump, the chiller, and the first opening such that carbon dioxide moved by the pump passes through the pump through the second opening from inside the washing tub, passes through the chiller to be cooled by the chiller, and is returned to the washing tub through the first opening.

[0011] The washing machine may further include a second passage connecting the distillation tank, the pump, and the first opening, so that carbon dioxide moved by the distillation tank and the pump passes through the pump from inside the distillation tank and then moves to the washing tank through the first opening.

[0012] The washing machine may further include a first valve configured to open and close the first flow path, a second valve configured to open and close the second flow path, and a control unit, wherein the control unit controls the first valve and the second valve to open the first flow path and close the second flow path so that carbon dioxide moved by the pump passes through the pump along the first flow path at a first temperature and a first pressure from inside the washing tub through the second opening, and then returns to the inside of the washing tub through the first opening at a second temperature lower than the first temperature and a second pressure lower than the first pressure, via the chiller, and the carbon dioxide moved by the pump passes through the pump along the second flow path at a third temperature and a third pressure from inside the distillation tank, and then returns through the first opening at a fourth temperature higher than the third temperature and a fourth pressure higher than the third pressure, The first valve and the second valve can be controlled to open the second flow path and close the first flow path so as to move inside the washing machine.

[0013] The washing machine may further include a third passage connecting the distillation tank, the chiller, and the first opening, such that the carbon dioxide heated by the heater is cooled by the chiller from inside the distillation tank and then passes through the chiller to move to the washing tank through the first opening, and the third passage branches off from the second passage at a point on the second passage and joins the first passage at a point on the first passage.

[0014] The washing machine may further include a supplementary tank, and the supplementary tank may be connected to the upstream side of the pump in the second flow path so that carbon dioxide moved by the pump passes through the pump along the second flow path from the inside of the supplementary tank and then moves to the washing tub through the first opening along the second flow path.

[0015] The washing machine may further include a fourth passage connecting the second opening, the pump, and the distillation tank so that carbon dioxide moved by the pump passes through the second opening from inside the washing tank and then moves to the distillation tank, and the fourth passage may be branched from the downstream side of the pump of the first passage.

[0016] The washing machine may further include a fifth passage connecting the second opening of the washing tank, the pump, the chiller, and the distillation tank so that carbon dioxide moved by the pump passes through the second opening from inside the washing tank and then moves to the distillation tank via the chiller, and the fifth passage is a washing machine branched from the downstream side of the pump of the first passage.

[0017] The washing machine may further include a washing tank heat exchanger, and the fifth flow path may connect the second opening, the pump, the washing tank heat exchanger, and the distillation tank so that carbon dioxide moved by the pump passes through the pump from inside the washing tank through the second opening, and then moves to the distillation tank through the washing tank heat exchanger to exchange heat with the carbon dioxide inside the washing tank.

[0018] The distillation tank may include a third opening and a fourth opening, and the fifth flow path may connect the third opening from the downstream side of the pump through the chiller.

[0019] The distillation tank may include a third opening and a fourth opening, and the fourth flow path may connect the downstream side of the pump and the fourth opening.

[0020] The washing machine may further include a sixth passage connecting the third opening, the chiller, and the fourth opening so that carbon dioxide cooled by the chiller passes through the chiller from inside the distillation tank at a fifth temperature and a fifth pressure through the third opening, and then moves to the distillation tank through the fourth opening at a sixth temperature lower than the fifth temperature and a sixth pressure lower than the fifth pressure.

[0021] The washing machine may further include a filter provided on the upstream side of the pump to prevent foreign substances larger than a predetermined size from entering the pump.

[0022] The washing machine is arranged to increase the temperature inside the distillation tank, and may further include a heater adjacent to the distillation tank.

[0023] The washing machine may further include a first temperature sensor configured to measure a temperature inside the washing tub and a first pressure sensor configured to measure a pressure inside the washing tub.

[0024] The washing machine may further include a second temperature sensor configured to measure a temperature inside the distillation tank and a second pressure sensor configured to measure a pressure inside the distillation tank.

[0025] A method for controlling a washing machine including a washing tank, a distillation tank, a pump, and a chiller according to one embodiment is provided, which discharges air inside the washing tank, supplies carbon dioxide to the washing tank, controls the temperature and pressure inside the washing tank, performs washing, discharges carbon dioxide in the washing tank to the distillation tank, supplies carbon dioxide to the washing tank, controls the temperature and pressure inside the washing tank, performs rinsing, discharges carbon dioxide in the washing tank to the distillation tank, and depressurizes the inside of the washing tank.

[0026] Figure 1 is a conceptual diagram illustrating the carbon dioxide flow of a washing machine according to one embodiment.

[0027] Figure 2 is a control block diagram of a washing machine according to one embodiment.

[0028] FIG. 3 is a conceptual diagram illustrating a process of supplying gaseous carbon dioxide to a washing tub in a washing machine according to one embodiment.

[0029] FIG. 4 is a conceptual diagram illustrating a process of supplying liquid carbon dioxide to a washing tub in a washing machine according to one embodiment.

[0030] FIG. 5 is a conceptual diagram illustrating a process of supplying carbon dioxide from a replenishment tank to a washing tub in a washing machine according to one embodiment.

[0031] FIG. 6 is a conceptual diagram for explaining a process of lowering the temperature and pressure inside a washing tub in a washing machine according to one embodiment.

[0032] FIG. 7 is a conceptual diagram for explaining a process of increasing the temperature and pressure inside a washing tub in a washing machine according to one embodiment.

[0033] FIG. 8 is a conceptual diagram illustrating a process of discharging carbon dioxide and foreign substances inside a washing machine into a distillation tank according to one embodiment.

[0034] FIG. 9 is a conceptual diagram illustrating a process of lowering the pressure inside a washing tub before opening the washing tub in a washing machine according to one embodiment.

[0035] Fig. 10 is a conceptual diagram for explaining a process of lowering the temperature and pressure inside a distillation tank in a washing machine according to one embodiment.

[0036] Fig. 11 illustrates a control method of a washing machine according to one embodiment.

[0037] It should be understood that the various embodiments and terms used in this document are not intended to limit the technical features described in this document to specific embodiments, but rather to include various modifications, equivalents, or substitutes of the embodiments.

[0038] In connection with the description of the drawings, similar reference numerals may be used for similar or related components.

[0039] The singular form of a noun corresponding to an item may include one or more of said items, unless the relevant context clearly indicates otherwise.

[0040] In this document, each of the phrases "A or B", "at least one of A and B", "at least one of A or B", "A, B, or C", "at least one of A, B, and C", and "at least one of A, B, or C" may include any one of the items listed together in that phrase, or all possible combinations thereof.

[0041] The term "and / or" includes any combination of a plurality of related described elements or any one of a plurality of related described elements.

[0042] Terms such as "first," "second," or "first" or "second" may be used simply to distinguish one component from another and do not qualify the components in any other respect (e.g., importance or order).

[0043] When a component (e.g., a first component) is referred to as being "coupled" or "connected" to another component (e.g., a second component), with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0044] The terms "include" or "have" are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in this document, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0045] When a component is said to be “connected,” “coupled,” “supported,” or “in contact with” another component, this includes not only cases where the components are directly connected, coupled, supported, or in contact, but also cases where the components are indirectly connected, coupled, supported, or in contact through a third component.

[0046] When we say that a component is "on" another component, this includes not only cases where the component is in contact with the other component, but also cases where there is another component between the two components.

[0047] Washing machines according to various embodiments may include a housing that accommodates various components therein. The housing may be provided in the form of a box with a laundry inlet formed on one side.

[0048] A washing machine may include a door for opening and closing the laundry compartment. The door may be rotatably mounted to the housing by a hinge. At least a portion of the door may be transparent or translucent to allow the interior of the housing to be viewed.

[0049] A washing machine may include a drum configured to accommodate laundry.

[0050] The drum can rotate within the housing and perform each operation according to the washing and rinsing cycles. A plurality of holes can be formed in the cylindrical wall of the drum.

[0051] A washing machine may include a drive device configured to rotate a drum. The drive device may include a drive motor and a rotating shaft for transmitting driving force generated by the drive motor to the drum.

[0052] The driving device can perform each operation according to the washing and rinsing cycle by rotating the drum forward or backward.

[0053] The washing machine may include a control panel positioned on one side of the housing. The control panel may provide a user interface for a user to interact with the washing machine. The user interface may include at least one input interface and at least one output interface.

[0054] At least one input interface can convert sensory information received from a user into an electrical signal.

[0055] At least one input interface may include a power button, an operation button, a course selection dial (or course selection button), and a wash / rinse button. The at least one input interface may include, for example, a tact switch, a push switch, a slide switch, a toggle switch, a micro switch, a touch switch, a touch pad, a touch screen, a jog dial, and / or a microphone.

[0056] At least one output interface can visually or audibly convey information related to the operation of the washing machine to the user.

[0057] For example, at least one output interface may transmit information related to the washing cycle, operating time of the washing machine, and washing / rinsing settings to the user. Information related to the operation of the washing machine may be output via a screen, indicator, voice, etc. The at least one output interface may include, for example, a liquid crystal display (LCD) panel, a light emitting diode (LED) panel, a speaker, etc.

[0058] The washing machine may include a communication module for communicating with external devices via wires and / or wirelessly.

[0059] The communication module may include at least one of a short-range communication module or a long-range communication module.

[0060] The communication module can transmit data to or receive data from external devices (e.g., a server, a user device, and / or a home appliance). For example, the communication module can establish communication with a server, a user device, and / or a home appliance, and transmit and receive various data.

[0061] To this end, the communication module may support the establishment of a direct (e.g., wired) communication channel or a wireless communication channel between external devices, and the performance of communication through the established communication channel. According to one embodiment, the communication module may include a wireless communication module (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module (e.g., a local area network (LAN) communication module, or a power line communication module). Any of these communication modules may communicate with the external device via a first network (e.g., a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network (e.g., a long-range communication network such as a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., a LAN or WAN)). These various types of communication modules may be integrated into a single component (e.g., a single chip) or implemented as multiple separate components (e.g., multiple chips).

[0062] The short-range wireless communication module may include, but is not limited to, a Bluetooth communication module, a BLE (Bluetooth Low Energy) communication module, a near field communication module, a WLAN (Wi-Fi) communication module, a Zigbee communication module, an infrared (IrDA, infrared Data Association) communication module, a WFD (Wi-Fi Direct) communication module, an UWB (ultrawideband) communication module, an Ant+ communication module, a microwave (uWave) communication module, etc.

[0063] The long-distance communication module may include a communication module that performs various types of long-distance communication and may include a mobile communication unit. The mobile communication unit transmits and receives wireless signals with at least one of a base station, an external terminal, and a server on a mobile communication network.

[0064] In one embodiment, the communication module can communicate with external devices such as a server, a user device, and other home appliances through a peripheral access point (AP). The access point (AP) can connect a local area network (LAN) to which the washing machine or the user device is connected to a wide area network (WAN) to which the server is connected. The washing machine or the user device can be connected to the server through the wide area network (WAN). The control unit can control various components of the washing machine, such as a drive motor. The control unit can control various components of the washing machine to perform at least one cycle, including water supply, washing, and rinsing, based on user input. For example, the control unit can control the drive motor to adjust the rotation speed of the drum.

[0065] The control unit may include hardware such as a CPU or memory, and software such as a control program. For example, the control unit may include an algorithm for controlling the operation of components within the washing machine, at least one memory storing program-type data, and at least one processor performing the aforementioned operation using data stored in the at least one memory. The memory and the processor may each be implemented as separate chips. The processor may include one or more processor chips or one or more processing cores. The memory may include one or more memory chips or one or more memory blocks. Additionally, the memory and the processor may be implemented as a single chip.

[0066] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the attached drawings.

[0067] Figure 1 is a conceptual diagram illustrating the carbon dioxide flow of a washing machine according to one embodiment.

[0068] Referring to FIG. 1, a washing machine according to one embodiment may include a washing tub (10) that performs laundry internally using carbon dioxide, a distillation tank (20) provided to receive carbon dioxide and foreign substances discharged from the washing tub (10), a pump (30) provided to compress and move liquid carbon dioxide or gaseous carbon dioxide, and a chiller (40) provided on a path through which carbon dioxide flows to lower the temperature of the carbon dioxide. The washing machine may further include a supplementary tank (50) provided to supplement carbon dioxide lost in the process of recovering carbon dioxide after washing.

[0069] The washing tub (10) can provide a space for washing laundry using liquid carbon dioxide as a washing solvent. The washing tub (10) can store liquid carbon dioxide and gaseous carbon dioxide inside. The washing tub (10) can form a sealed space inside so as to store gaseous carbon dioxide at a high pressure of approximately 20 bar or more. The washing tub (10) can be designed to maintain an internal pressure above a predetermined pressure. The washing tub (10) can be a type of compression vessel.

[0070] A drum (not shown) may be rotatably positioned inside the washing tub (10). An openable door (not shown) may be provided in the washing tub (10) to allow laundry to be loaded into the drum positioned inside the washing tub (10).

[0071] The washing tub (10) may include a first opening (11) formed in the washing tub (10) so that carbon dioxide outside the washing tub (10) flows into the inside of the washing tub (10), and a second opening (12) formed in the washing tub (10) so that carbon dioxide inside the washing tub (10) is discharged outside the washing tub (10).

[0072] The above description does not exclude carbon dioxide emission through the first opening (11). Similarly, the above description does not exclude carbon dioxide inflow through the second opening (12). Carbon dioxide may be emitted through the first opening (11) or may be introduced through the second opening (12).

[0073] The first opening (11) may be formed at a higher position than the second opening (12). Gaseous carbon dioxide and / or liquid carbon dioxide may flow into the washing tub (10) through the first opening (11). The first opening (11) may be formed at a higher position than the full water level of the washing tub (10). The full water level may refer to the maximum level of liquid carbon dioxide contained within the washing tub (10).

[0074] After the washing or rinsing cycle, the second opening (12) may be formed on the lower surface of the washing tub (10) or at a location adjacent to the lower surface so that liquid carbon dioxide and foreign substances inside the washing tub (10) are discharged through the second opening (12).

[0075] During the process of loading laundry into the drum within the washing tub (10), air may be introduced into the washing tub (10). If air is introduced into the washing tub (10), moisture contained in the air may condense during the process of lowering the pressure within the washing tub (10) after the washing process is completed. If moisture introduced between the laundry condenses, the laundry may be damaged. To prevent this, the washing machine may further include a vacuum pump (31) configured to exhaust air within the washing tub (10).

[0076] The chiller (40) may be placed on a conduit (200) through which carbon dioxide flows. The chiller (40) may be placed adjacent to the conduit so as to exchange heat with the carbon dioxide flowing within the conduit. The chiller (40) may lower the temperature of the carbon dioxide by exchanging heat with the carbon dioxide within the conduit. The chiller (40) may liquefy the gaseous carbon dioxide within the conduit. In other words, the gaseous carbon dioxide may be liquefied by passing through a portion of the conduit in which the chiller (40) is placed.

[0077] The chiller (40) can liquefy carbon dioxide discharged from the distillation tank (20) in a gaseous state. The carbon dioxide discharged from the distillation tank (20) in a gaseous state can be liquefied by heat exchange with the chiller (40) and then supplied to the washing tank (10) in a liquid state. Conversely, the carbon dioxide discharged from the washing tank (10) in a gaseous state can be liquefied by heat exchange with the chiller (40) and then returned to the distillation tank (20) in a liquid state. In addition, the carbon dioxide discharged from the distillation tank (20) in a gaseous state can be liquefied by heat exchange with the chiller (40) and then returned to the distillation tank (20) in a liquid state. The specific flow of this carbon dioxide will be described later.

[0078] The chiller (40) may include an evaporator of a heat pump, but is not limited thereto. The chiller (40) may include at least one of various types of cooling devices.

[0079] The distillation tank (20) may be provided to receive carbon dioxide and foreign substances discharged from the washing tank (10). The distillation tank (20) may receive liquid carbon dioxide discharged from the washing tank (10), foreign substances dissolved or not dissolved in the liquid carbon dioxide, and gaseous carbon dioxide therein.

[0080] The distillation tank (20) may include a third opening (21) and a fourth opening (22). Carbon dioxide inside the distillation tank (20) may be discharged through the third opening (21). In addition, carbon dioxide may be introduced into the distillation tank (20) through the third opening (21). Carbon dioxide may be introduced into the distillation tank (20) through the fourth opening (22). Although not shown in the drawing, carbon dioxide inside the distillation tank (20) may also be discharged through the fourth opening (22).

[0081] The third opening (21) may be formed at a higher position than the fourth opening (22). This is to facilitate the discharge of gaseous carbon dioxide inside the distillation tank (20) through the third opening (21), but the positions of the third opening (21) and the fourth opening (22) are not limited thereto. The third opening (21) and the fourth opening (22) may be formed at the same height, or the fourth opening (22) may be formed at a higher position than the third opening (21).

[0082] The washing machine according to the present disclosure may not include a storage tank configured to store carbon dioxide. In the case of a washing machine including a storage tank, the carbon dioxide stored in the storage tank may be supplied to the washing tub. Since the washing machine according to the present disclosure does not include a storage tank, the carbon dioxide contained within the distillation tank (20) may be supplied to the washing tub (10). The carbon dioxide supplied to the washing tub (10) may be recovered to the distillation tank (20) after the washing or rinsing cycle is completed.

[0083] In the process of recovering carbon dioxide from the washing tank (10) to the distillation tank (20), loss of carbon dioxide may occur. To compensate for this, the washing machine may further include a supplementary tank (50).

[0084] The supplementary tank (50) may be provided to supplement carbon dioxide lost during the process of recovering carbon dioxide from the washing tub (10) to the distillation tank (20), the depressurization process for opening the washing tub, and other various processes. The supplementary tank (50) may be provided to store carbon dioxide therein. The supplementary tank (50) may supply carbon dioxide to the washing tub (10). Carbon dioxide inside the supplementary tank (50) may be supplied to the washing tub (10) via the pump (30). The supplementary tank (50) may be provided to be detachable from the washing machine. The supplementary tank (50) may be provided to be replaceable with another supplementary tank. Alternatively, the supplementary tank (50) may be provided to be detachable from the washing machine, replenish carbon dioxide therein, and then be reattached to the washing machine.

[0085] In the process of supplying carbon dioxide from the distillation tank (20) to the washing tank (10), the liquid carbon dioxide inside the distillation tank (20) can be vaporized. Foreign substances contained inside the distillation tank (20) can be separated from the carbon dioxide as the liquid carbon dioxide vaporizes. When the liquid carbon dioxide vaporizes, foreign substances dissolved in the liquid carbon dioxide are separated from the liquid carbon dioxide. Foreign substances inside the distillation tank (20) separated from the carbon dioxide can be discharged to a foreign substance tank (not shown).

[0086] A foreign matter tank may be provided to store foreign matter discharged from the distillation tank (20). The user may discharge the foreign matter stored in the foreign matter tank at an appropriate interval. The emptying cycle of the foreign matter tank may vary depending on the capacity of the foreign matter tank and the amount of foreign matter contained in the laundry.

[0087] The washing machine may include a heater (41) to vaporize liquid carbon dioxide inside the distillation tank (20). The heater (41) may be placed inside the distillation tank (20) to directly transfer heat to the carbon dioxide. Alternatively, the heater (41) may be placed outside the distillation tank (20). The heater (41) may be placed adjacent to the distillation tank (20) to increase heat exchange efficiency with the carbon dioxide contained inside the distillation tank (20).

[0088] In one embodiment, the washing machine may include a heat pump. In this case, the evaporator of the heat pump may be used as a chiller (40). The condenser of the heat pump may be used as a heater (41). Alternatively, various heat sources, such as electric heaters, gas heaters, and oil heaters, may be used as the heater of the washing machine according to one embodiment.

[0089] The washing machine may include a pump (30) configured to move liquid carbon dioxide or gaseous carbon dioxide. In one embodiment, the pump (30) may be configured to move not only liquids but also gases. As described below, depending on the operation of the washing machine, either liquid carbon dioxide or gaseous carbon dioxide may flow into the pump (30). Furthermore, liquid carbon dioxide and gaseous carbon dioxide may flow into the pump (30) in a mixed state.

[0090] The pump (30) according to one embodiment is configured to move a liquid, a gas, or a mixture of liquid and gas, respectively, so that the carbon dioxide introduced into the pump (30) can be moved regardless of the state of the carbon dioxide introduced into the pump (30). The carbon dioxide discharged from the pump (30) can move along the flow path (200) and then be accommodated in the washing tank (10) or the distillation tank (20).

[0091] Since the washing machine according to the present disclosure includes a pump (30) capable of moving liquid, the arrangement of the washing tub (10) and the distillation tank (20) is not limited. In the case of a washing machine including a compressor for transporting gas and not including a pump, the washing tub can be arranged higher than the distillation tank so that liquid carbon dioxide can be discharged from the washing tub to the distillation tank using gravity. In a washing machine with such a structure, there is a restriction that the washing tub must be arranged higher than the distillation tank. However, in the washing machine according to the present disclosure, since the pump (30) can move liquid carbon dioxide, the distillation tank (20) may not be arranged below the washing tub (10). Accordingly, the distillation tank (20) and the washing tub (10) can be arranged at the same height, or alternatively, the distillation tank (20) may be positioned higher than the washing tub (10). In other words, various arrangements of the washing tub (10) and the distillation tank (20) are possible.

[0092] The washing machine may include a filter (32) configured to filter out foreign substances contained in carbon dioxide flowing into the pump (30). The filter (32) may be configured to filter out foreign substances having a relatively large volume. For example, the filter (32) may filter out foreign substances accidentally contained in laundry and / or foreign substances having a large volume that may interfere with the operation of the pump (30) from flowing into the pump (30). Foreign substances that pass through the filter (32) without being filtered out may be separated inside the distillation tank (20) and discharged into the foreign substance tank.

[0093] The filter (32) may be installed on the flow path (200) through which carbon dioxide flows. Since the filter (32) is a configuration provided to prevent foreign substances from entering the inside of the pump (30), it may be installed upstream of the pump (30) on the flow path (200). In other words, the pump (30) may be installed downstream of the filter (32) on the flow path (200).

[0094] Referring to FIG. 1, the washing machine may include a conduit (200) through which carbon dioxide flows. The conduit (200) may be formed by various types of structures, including pipes and ducts.

[0095] Carbon dioxide can move along the path (200). Gaseous carbon dioxide, liquid carbon dioxide, and a mixture of gaseous carbon dioxide and liquid carbon dioxide can move along the path (200). The path (200) can form a path along which carbon dioxide moves. The path (200) can connect the washing tank (10), the distillation tank (20), and the pump (30) described above. The path (200) can connect the washing tank (10), the distillation tank (20), and the pump (30) through at least one path.

[0096] The euro (200) may be provided with a euro connection portion (300) that allows multiple euros to be combined into one euro or one euro to be branched into multiple euros. The euro (200) may be provided with multiple euro connection portions (300).

[0097] The washing machine may include a valve (100) provided in a flow path (200). The valve (100) may be provided to open and close the flow path (200). The washing machine may include a plurality of valves (100). Each of the plurality of valves (100) may be controlled by a control unit (60).

[0098] The valve may include a first valve to a fourteenth valve (101 to 114). The flow path (200) may include a first flow path to an eighth flow path (201 to 208). The flow path connection may include a first flow path connection to an eleventh flow path connection (301 to 311). A detailed description of the valve, flow path, and flow path connection will be provided below.

[0099] Figure 2 is a control block diagram of a washing machine according to one embodiment.

[0100] Referring to FIG. 2, the washing machine may include a first temperature sensor (71) configured to measure the temperature inside the washing tub (10) and a second temperature sensor (72) configured to measure the temperature inside the distillation tank (20). In addition, the washing machine may include a first pressure sensor (73) configured to measure the pressure inside the washing tub (10) and a second pressure sensor (74) configured to measure the pressure inside the distillation tank (20).

[0101] The washing machine may include a control unit (60) configured to control the first to fourteenth valves (101 to 114), a pump (30), and a vacuum pump (31).

[0102] The control unit (60) can receive temperature data measured by the first temperature sensor (71) and the second temperature sensor (72), respectively. The control unit (60) can control the first to fourteenth valves (101 to 114), the pump (30), and the vacuum pump (31) based on the temperature data received from the first temperature sensor (71) and the second temperature sensor (72).

[0103] The control unit (60) can receive pressure data measured by the first pressure sensor (73) and the second pressure sensor (74), respectively. The control unit (60) can control the first to fourteenth valves (101 to 114), the pump (30), and the vacuum pump (31) based on the pressure data received from the first pressure sensor (73) and the second pressure sensor (74).

[0104] FIG. 3 is a conceptual diagram illustrating a process of supplying gaseous carbon dioxide to a washing tub in a washing machine according to one embodiment.

[0105] Hereinafter, the process of supplying gaseous carbon dioxide to the washing tank (10) will be described with reference to FIG. 3.

[0106] As described above, the washing tub (10) can accommodate a drum (not shown) that is rotatably arranged inside the washing tub (10). Laundry can be loaded into the drum, and the drum can include a drum opening through which laundry can be loaded. The washing tub (10) can include a washing tub opening (not shown) formed to have substantially the same size and shape as the drum opening for loading laundry into the drum, and a door (not shown) for opening and closing the washing tub opening. A user can open the door of the washing tub (10) and then load laundry into the drum through the washing tub opening and the drum opening. When loading laundry is completed, the user can close the door of the washing tub (10).

[0107] The control unit (60) can operate the vacuum pump (31) to discharge air inside the washing tub (10) when laundry is loaded into the drum inside the washing tub (10) and the door is closed. The control unit (60) can open the 12th valve (112) and operate the vacuum pump (31). The vacuum pump (31) can forcibly discharge air inside the washing tub (10) to create a low-pressure state close to a vacuum inside the washing tub (10).

[0108] As the vacuum pump (31) operates and the air inside the washing tub (10) is discharged, carbon dioxide in the distillation tank (20) can be supplied to the washing tub (10). More specifically, gaseous carbon dioxide inside the distillation tank (20) can be supplied to the washing tub (10). Hereinafter, the step of increasing the pressure inside the washing tub (10) by supplying gaseous carbon dioxide to the washing tub (10), whose internal pressure has been greatly reduced due to the operation of the vacuum pump (31), can be referred to as a pressurization step.

[0109] The washing machine may include a first passage (201) connecting a distillation tank (20) and a washing tank (10). Carbon dioxide in the distillation tank (20) may move to the washing tank (10) along the first passage (201). Carbon dioxide inside the distillation tank (20) may be supplied to the washing tank (10) through a filter (32) and a pump (30) along the first passage (201).

[0110] In the pressurizing step, the control unit (60) can operate the heater (41). As the heater (41) operates, the liquid carbon dioxide inside the distillation tank (20) can be vaporized into gaseous carbon dioxide. As vaporization occurs inside the distillation tank (20), gaseous carbon dioxide is generated, and the gaseous carbon dioxide can be supplied to the washing tank (10) along the first flow path (201). The gaseous carbon dioxide introduced from the distillation tank (20) into the first flow path (201) can move to the washing tank (10) through the filter (32) and the pump (30). The pump (30) can provide kinetic energy to the carbon dioxide so that the carbon dioxide can move along the first flow path (201). Since the first flow path (201) is not provided with a chiller (40) and the temperature of the carbon dioxide increases as it passes through the pump (30), the carbon dioxide discharged in a gaseous state from the distillation tank (20) can be supplied to the washing tank (10) in a gaseous state without being liquefied. Through this, the pressure inside the washing tank (10) can increase.

[0111] A first valve (101), a second valve (102), a third valve (103), a seventh valve (107), a ninth valve (109), and a tenth valve (110) may be provided in the first flow path (201). However, the number and arrangement of valves provided in the first flow path (201) may be changed within the scope that does not change the concept of the present disclosure.

[0112] The first euro (201) may be provided with a first euro connection (301), a second euro connection (302), a third euro connection (303), a fourth euro connection (304), a fifth euro connection (305), a sixth euro connection (306), a seventh euro connection (307), an eighth euro connection (308), and a ninth euro connection (309). However, the number and arrangement of euro connections provided in the first euro (201) may be changed within the scope of not changing the concept of the present disclosure.

[0113] In the pressurization step, the control unit (60) can open the first valve (101), the second valve (102), the third valve (103), the seventh valve (107), the ninth valve (109), and the tenth valve (110). The control unit (60) can close the eleventh valve (111), the fourth valve (104), the fifth valve (105), the sixth valve (106), the eighth valve (108), the twelfth valve (112), the thirteenth valve (113), and the fourteenth valve (114). The control unit (60) can operate the pump (30).

[0114] When the first valve (101) is opened, carbon dioxide discharged through the third opening (21) of the distillation tank (20) can pass through the first valve (101) and move to the first flow path connection (301). In the first flow path connection (301), the flow path (200) can be branched into a first branch flow path (211) in which the eleventh valve (111) is arranged, and a second branch flow path (212) in which the second valve (102) is arranged.

[0115] Since the second valve (102) is open and the eleventh valve (111) is closed, carbon dioxide can move along the second branch flow path (212). A second flow path connection (302) may be provided at the end of the second branch flow path (212). At the second flow path connection (302), the flow path (200) may be branched into a third branch flow path (213) in which the third valve (103) is arranged, and a fourth branch flow path (214) in which the fourth valve (104) is arranged.

[0116] Since the third valve (103) is open and the fourth valve (104) is closed, carbon dioxide can move along the third branch flow path (213). The third branch flow path (213) may be provided with a third flow path connection (303) and a fourth flow path connection (304). At the third flow path connection (303), the flow path (200) may be branched into a fifth branch flow path (215) in which the fifth valve (105) is disposed. At the fourth flow path connection (304), the flow path (200) may be branched into a sixth branch flow path (216) in which the sixth valve (106) is disposed, and a seventh branch flow path (217) in which the filter (32) and the pump (30) are disposed.

[0117] Since the fifth valve (105) and the sixth valve (106) are closed, carbon dioxide can flow into the pump (30) through the third branch flow path (213), the third flow path connection (303) and the fourth flow path connection (304), and the filter (32). Carbon dioxide discharged by the pump (30) can move to the fifth flow path connection (305). At the fifth flow path connection (305), the flow path (200) can be branched into the eighth branch flow path (218) in which the eleventh flow path connection (311) is provided, and the ninth branch flow path (219) in which the sixth flow path connection (306) is provided.

[0118] At the 11th flow connection (311), the flow (200) can be branched into a 4th branch flow (214) in which the 4th valve (104) is arranged, and a 10th branch flow (214) in which the 14th valve (114) is arranged. At the 6th flow connection (306), the flow (200) can be branched into an 11th flow (221) in which the 7th valve (107) and the 9th valve (109) are arranged, and a 12th flow (222) in which the 8th valve (108) is arranged and passes through the washing tub (10). The 11th flow (221) and the 12th flow (222) can join at the 7th flow connection (307).

[0119] Since the 14th valve (114), the 4th valve (104) and the 8th valve (108) are closed and the 7th valve (107) and the 9th valve (109) are opened, the carbon dioxide discharged from the pump (30) can move to the 8th flow path connection (308) through the 5th flow path connection (305), the 6th flow path connection (306) and the 7th flow path connection (307). At the 8th flow path connection (308), the flow path (200) can be branched into a 1st branch flow path (211) in which the 11th valve (111) and the chiller (40) are arranged, a 13th flow path (223) in which the 13th valve (113) is arranged, and a 14th flow path (224) in which the 10th valve (110) is arranged. A ninth branch flow (309) may be provided in the 14th branch flow (224). In the ninth branch flow (309), the flow (200) may be branched into a 15th branch flow (225) connected to the first opening (11) of the washing tub (10), and a 16th branch flow (226) in which the 12th valve (112) and the vacuum pump (31) are arranged.

[0120] Since the 11th valve (111), the 12th valve (112), and the 13th valve (113) are closed and the 10th valve (110) is opened, carbon dioxide can pass through the 9th flow connection (309) and move into the washing tub (10) through the first opening (11) of the washing tub (10).

[0121] Through the above-described path, carbon dioxide from the distillation tank (20) can be supplied to the washing tank (10) in a gaseous state through the filter (32) and the pump (30). As gaseous carbon dioxide is supplied to the washing tank (10), the pressure inside the washing tank (10) can increase.

[0122] FIG. 4 is a conceptual diagram illustrating a process of supplying liquid carbon dioxide to a washing tub in a washing machine according to one embodiment.

[0123] Hereinafter, the process of supplying liquid carbon dioxide to the washing tank (10) will be described with reference to FIG. 4.

[0124] When the pressure inside the washing tub (10) becomes higher than the set value after the pressurization step described above, the washing machine can supply liquid carbon dioxide to the washing tub (10). This can be referred to as a carbon dioxide supply step or a liquid carbon dioxide supply step.

[0125] In the carbon dioxide supply stage, the control unit (60) can operate the heater (41). As the heater (41) operates, the liquid carbon dioxide inside the distillation tank (20) can be vaporized into gaseous carbon dioxide. The control unit (60) can operate the chiller (40). As the chiller (40) operates, the gaseous carbon dioxide passing through the first branch passage (211) can be liquefied.

[0126] The control unit (60) can open the first valve (101), the eleventh valve (111), and the tenth valve (110). The control unit (60) can close the second valve (102), the thirteenth valve (113), the ninth valve (109), and the twelfth valve (112).

[0127] When the first valve (101) is opened, carbon dioxide discharged through the third opening (21) of the distillation tank (20) can pass through the first valve (101) and move to the first flow path connection (301). As described above, in the first flow path connection (301), the flow path (200) can be branched into a first branch flow path (211) and a second branch flow path (212).

[0128] Since the second valve (102) is closed and the eleventh valve (111) is opened, carbon dioxide can move along the first branch flow path (211) through the chiller (40) to the eighth flow path connection (308). As it passes through an area of ​​the flow path (200) where the chiller (40) is placed, the gaseous carbon dioxide inside the flow path (200) can be liquefied.

[0129] As described above, in the 8th euro connection (308), the euro (200) can be branched into a 13th branch euro (223) in which the 13th valve (113) is arranged, a 14th branch euro (224) in which the 10th valve (110) is arranged, and an 11th branch euro (221) in which the 9th valve (109) is arranged.

[0130] Since the 13th valve (113) and the 9th valve (109) are closed and the 10th valve (110) is opened, carbon dioxide can move along the 14th branch flow path (224) to the 9th flow path connection (309).

[0131] At the 9th branch connection (309), the branch (200) can be branched into a 16th branch branch (226) in which the 12th valve (112) and the vacuum pump (31) are arranged, and a 15th branch branch (225) connected to the first opening (11) of the washing tub (10). Since the 12th valve (112) is closed, carbon dioxide can move into the washing tub (10) through the first opening (11) of the washing tub (10) along the 15th branch branch branch (225).

[0132] Through the above-described path, carbon dioxide from the distillation tank (20) can be supplied to the washing tank (10) in a liquid state via the chiller (40). As the liquid carbon dioxide is supplied to the washing tank (10), the drum inside the washing tank (10) can be rotated to perform the washing process.

[0133] FIG. 5 is a conceptual diagram illustrating a process of supplying carbon dioxide from a replenishment tank to a washing tub in a washing machine according to one embodiment.

[0134] Hereinafter, the process of supplying carbon dioxide from a supplementary tank (50) to a washing tank (10) will be described with reference to FIG. 5.

[0135] As will be described later, carbon dioxide may be lost during the process of recovering carbon dioxide from the washing tank (10) to the distillation tank (20), depressurizing the inside of the washing tank (10) after washing is completed, or discharging foreign substances inside the distillation tank (20) to a foreign substance tank. To replenish carbon dioxide, a replenishment tank (50) may be provided, as described above.

[0136] In one embodiment, carbon dioxide from the replenishment tank (50) can be supplied to the washing tank (10). Although not shown in the drawing, carbon dioxide from the replenishment tank (50) can also be supplied to the distillation tank (10).

[0137] When supplying carbon dioxide from the supplementary tank (50) to the washing tank (10), the control unit (60) can open the fifth valve (105), the seventh valve (107), the ninth valve (109), and the tenth valve (110). The control unit (60) can close the third valve (103), the sixth valve (106), the fourth valve (104), the fourteenth valve (114), the eighth valve (108), the thirteenth valve (113), the eleventh valve (111), and the twelfth valve (112). The control unit (60) can operate the pump (30).

[0138] When the fifth valve (105) is opened, carbon dioxide in the supplementary tank (50) can move along the fifth branch flow path (215) to the third flow path connection (303). Since the third valve (103) and the sixth valve (106) are closed at the third flow path connection (303), carbon dioxide can flow into the pump (30) through the filter (32).

[0139] Carbon dioxide discharged from the pump (30) can move to the fifth flow connection (305). Since the fourth valve (104) and the fourteenth valve (114) are closed and the seventh valve (107) is opened in the fifth flow connection (305), carbon dioxide can move to the sixth flow connection (306) along the ninth branch flow path (219).

[0140] Since the eighth valve (108) is closed and the seventh valve (107) and the ninth valve (109) are opened, carbon dioxide can pass through the sixth flow connection (306) to the eighth flow connection (308).

[0141] Since the 11th valve (111) and the 13th valve (113) are closed and the 10th valve (110) is opened at the 8th flow connection (308), carbon dioxide can move to the 9th flow connection (309). Since the 12th valve (112) is closed at the 9th flow connection (309), carbon dioxide can move into the washing tub (10) through the first opening (11) of the washing tub (10) along the 15th branch flow path (225).

[0142] Through the above-described path, carbon dioxide in the replenishment tank (50) can be supplied to the washing tub (10) via the filter (32) and the pump (30). By replenishing carbon dioxide from the replenishment tank (50), the amount of carbon dioxide required for the operation of the washing machine can be maintained.

[0143] FIG. 6 is a conceptual diagram illustrating a process for lowering the temperature and pressure inside a washing tub in a washing machine according to one embodiment. FIG. 7 is a conceptual diagram illustrating a process for raising the temperature and pressure inside a washing tub in a washing machine according to one embodiment.

[0144] Hereinafter, the process of lowering the temperature and pressure inside the washing tub (10) and the process of raising the temperature and pressure inside the washing tub (10) will be described with reference to FIGS. 6 and 7.

[0145] When gaseous and liquid carbon dioxide are supplied to the inside of the washing tub (10) through the process described in FIGS. 3 to 5, the drum can be rotated to perform washing. Prior to performing washing, it is necessary to adjust the temperature and pressure inside the washing tub (10) to a set value or within a set range.

[0146] If the temperature inside the washing tub (10) is too low, moisture in the air remaining inside the washing tub (10) may condense. If moisture that has penetrated the laundry condenses, problems such as damage to the laundry may occur. Conversely, if the temperature inside the washing tub (10) is too high, the liquid carbon dioxide inside the washing tub (10) may vaporize. This may result in a problem such as a lack of liquid carbon dioxide inside the washing tub (10) or an excessive increase in pressure inside the washing tub (10).

[0147] In order to control the temperature and pressure inside the washing tub (10), the washing machine may include a first temperature sensor (71) provided to measure the temperature inside the washing tub (10) and a first pressure sensor (73) provided to measure the pressure inside the washing tub (10). In addition, the washing machine may include a second temperature sensor (72) provided to measure the temperature inside the distillation tank (20) and a second pressure sensor (74) provided to measure the pressure inside the distillation tank (20).

[0148] Before performing washing or rinsing, the control unit (60) can lower the temperature inside the washing tub (10) through the process described below based on the temperature data received from the first temperature sensor (71). The control unit (60) can lower the pressure inside the washing tub (10) through the process described below based on the pressure data received from the first pressure sensor (73).

[0149] Referring to Fig. 6, in order to lower the temperature and pressure inside the washing tub (10), the control unit (60) can open the sixth valve (106), the fourth valve (104), the second valve (102), the eleventh valve (111), and the tenth valve (110). The control unit (60) can close the third valve (103), the fifth valve (105), the seventh valve (107), the eighth valve (108), the fourteenth valve (114), the first valve (101), the thirteenth valve (113), the ninth valve (109), and the twelfth valve (112). The control unit (60) can operate the chiller (40) and the pump (30).

[0150] When the second opening (12) of the washing tank (10) is opened, the carbon dioxide in the washing tank (10) can move to the fourth flow path connection (304) along the sixth branch flow path (216) where the sixth valve (106) is arranged through the second opening (12).

[0151] At the fourth flow connection (304), the third valve (103) and the fifth valve (105) are closed, so that carbon dioxide can pass through the filter (32) and the pump (30) to the fifth flow connection (305). At the fifth flow connection (305), the flow (200) can be branched into the ninth branch flow (219) and the eighth branch flow (218).

[0152] The seventh valve (107) provided in the 9th quarter flow path (219), the eighth valve (108) provided in the 12th quarter flow path (222), and the fourteenth valve (114) provided in the 10th quarter flow path (220) are closed, and the fourth valve (104) provided in the 4th quarter flow path (214) is opened, so that carbon dioxide can move from the 5th flow path connection (305) along the 8th quarter flow path (218) to the 11th flow path connection (311), and then along the 4th quarter flow path (214) to the 2nd flow path connection (302).

[0153] In the second flow path connection (302), the third valve (103) is closed and the second valve (102) is open, so that carbon dioxide can move along the second branch flow path (212) to the first flow path connection (301). In the first flow path connection (301), the first valve (101) is closed and the eleventh valve (111) is open, so that carbon dioxide can move along the first branch flow path (211) to the eighth flow path connection (308) through the chiller (40).

[0154] At the 8th flow connection (308), the 13th valve (113) and the 9th valve (109) are closed and the 10th valve (110) is opened, so that carbon dioxide can move along the 14th flow connection (224) to the 9th flow connection (309).

[0155] Since the 12th valve (112) is closed at the 9th branch connection (309), carbon dioxide can move into the washing tub (10) through the first opening (11) of the washing tub (10) along the 15th branch connection (225).

[0156] Through the above-described path, carbon dioxide discharged from the washing tank (10) can pass through the filter (32) and the pump (30), exchange heat with the chiller (40), and then be introduced back into the washing tank (10). By exchanging heat with the chiller (40), the temperature is lowered or the liquefied carbon dioxide is introduced into the washing tank (10), so that the temperature inside the washing tank (10) can be lowered and the pressure inside the washing tank (10) can be lowered.

[0157] The control unit (60) can continue or stop the above process based on the temperature data and pressure data received through the first temperature sensor (71) and the first pressure sensor (73).

[0158] Before performing washing or rinsing, the control unit (60) can increase the temperature inside the washing tub (10) through the process described below based on the temperature data received from the first temperature sensor (71). The control unit (60) can increase the pressure inside the washing tub (10) through the process described below based on the pressure data received from the first pressure sensor (73).

[0159] Referring to Fig. 7, in order to increase the temperature and pressure inside the washing tub (10), the control unit (60) can open the first valve (101), the second valve (102), the third valve (103), the seventh valve (107), the ninth valve (109), and the tenth valve (110). The control unit (60) can close the eleventh valve (111), the fourth valve (104), the fifth valve (105), the sixth valve (106), the fourteenth valve (114), the eighth valve (108), the thirteenth valve (113), and the twelfth valve (112). The control unit (60) can operate the pump (30). The control unit (60) can operate the heater (41).

[0160] When the third opening (21) of the distillation tank (20) and the first valve (101) are opened, the carbon dioxide in the distillation tank (20) can pass through the third opening (21) and move to the first flow connection (301).

[0161] In the first flow connection (301), the eleventh valve (111) is closed and the second valve (102) is open, so that carbon dioxide can move along the second branch flow path (212) to the second flow connection (302). In the second flow connection (302), the fourth valve (104), the fifth valve (105), and the sixth valve (106) are closed, so that carbon dioxide can pass through the third flow connection (303) and the fourth flow connection (304) to the filter (32) and the pump (30).

[0162] Carbon dioxide discharged from the pump (30) can move to the sixth flow connection (306) along the ninth branch flow path (219) because the fourth valve (104) and the fourteenth valve (114) are closed. In the sixth flow connection (306), the eighth valve (108) is closed and the seventh valve (107) and the ninth valve (109) are open, so carbon dioxide can move to the eighth flow connection (308) through the seventh flow connection (307).

[0163] At the 8th flow connection (308), the 13th valve (113) and the 11th valve (111) are closed, and the 10th valve (110) is opened, so that carbon dioxide can move along the 14th flow connection (224) to the 9th flow connection (309).

[0164] Since the 12th valve (112) is closed at the 9th branch connection (309), carbon dioxide can move into the washing tub (10) through the first opening (11) of the washing tub (10) along the 15th branch connection (225).

[0165] Through the above-described path, carbon dioxide discharged from the distillation tank (20) can be supplied to the washing tank (10) after passing through the filter (32) and the pump (30). When the carbon dioxide passing through the pump (30) is continuously supplied into the washing tank (10) while the second opening (12) of the washing tank (10) is closed, the pressure inside the washing tank (10) gradually increases and the temperature inside the washing tank (10) can also increase. In other words, as carbon dioxide from the distillation tank (20) is supplied to the washing tank (10), the pressure and temperature inside the washing tank (10) can increase.

[0166] The control unit (60) can continue or stop the above process based on the temperature data and pressure data received through the first temperature sensor (71) and the first pressure sensor (73).

[0167] FIG. 8 is a conceptual diagram illustrating a process of discharging carbon dioxide and foreign substances inside a washing machine into a distillation tank according to one embodiment.

[0168] Hereinafter, with reference to FIG. 8, the process of discharging carbon dioxide and foreign substances inside the washing tank (10) to the distillation tank (20) after washing or rinsing is completed is described.

[0169] As described with reference to FIGS. 6 and 7, the washing machine can adjust the temperature and pressure inside the washing tub (10) before performing the washing or rinsing cycle. After the temperature and pressure inside the washing tub (10) have been adjusted, the washing cycle or rinsing cycle can be performed by rotating the drum. The washing cycle and the rinsing cycle differ in the order of the washing process, and may also differ in the rotation speed of the drum and the time for which the cycle is performed.

[0170] After the washing or rinsing process is completed, carbon dioxide and foreign substances inside the washing tank (10) can be discharged to the distillation tank (20).

[0171] Referring to Fig. 8, in order to discharge carbon dioxide and foreign substances inside the washing tank (10) into the distillation tank (20), the control unit (60) can open the sixth valve (106) and the twelfth valve (112). The control unit (60) can close the third valve (103), the fifth valve (105), the seventh valve (107), the eighth valve (108), and the fourth valve (104). The control unit (60) can operate the pump (30).

[0172] When the second opening (12) of the washing tub (10) is opened and the sixth valve (106) is opened, carbon dioxide and foreign substances inside the washing tub (10) can move along the sixth branch flow path (216) to the fourth flow path connection (304).

[0173] At the fourth connection (304), the third valve (103) and the fifth valve (105) are closed, so that carbon dioxide and foreign substances can flow into the pump (30) through the filter (32). As the carbon dioxide and foreign substances pass through the filter (32), some of the foreign substances can be removed by the filter (32).

[0174] Carbon dioxide and foreign substances discharged from the pump (30) can move to the fifth flow connection (305). In the fifth flow connection (305), the seventh valve (107), the eighth valve (108), and the fourth valve (104) are closed, and the fourteenth valve (114) is opened, so that carbon dioxide and foreign substances can move to the eleventh flow connection (311) along the eighth branch flow connection (218), and then to the tenth flow connection (310) along the tenth branch flow connection (220).

[0175] In the 10th connection (310), the 13th valve (113) is closed, so carbon dioxide and foreign substances can flow into the distillation tank (20) through the 4th opening (22) of the distillation tank (20).

[0176] After washing or rinsing is completed, the liquid carbon dioxide used for washing and rinsing remains inside the washing tub (10), so the liquid carbon dioxide can be discharged to the distillation tank (20) through the above process. The liquid carbon dioxide in the washing tub (10) can be recovered to the distillation tank (20). Recovering the liquid carbon dioxide does not exclude the recovery of the gaseous carbon dioxide. Through the above process, not only the liquid carbon dioxide inside the washing tub (10) but also the gaseous carbon dioxide can be recovered to the distillation tank (20).

[0177] FIG. 9 is a conceptual diagram illustrating a process of lowering the pressure inside a washing tub before opening the washing tub in a washing machine according to one embodiment.

[0178] Hereinafter, with reference to FIG. 9, a process of lowering the pressure inside the washing tub (10) to a level similar to atmospheric pressure before opening the washing tub (10) after washing is completed will be described.

[0179] A washing process can be performed after the pressurizing step described with reference to Fig. 3, the step of supplying gaseous carbon dioxide to the washing tank described with reference to Fig. 4, the step of supplying liquid carbon dioxide to the washing tank described with reference to Fig. 5, and the step of controlling the temperature and pressure inside the washing tank described with reference to Figs. 6 and 7. After the washing process is completed, carbon dioxide and foreign substances in the washing tank can be discharged to the distillation tank as described with reference to Fig. 8.

[0180] After the above process, liquid carbon dioxide is re-supplied from the distillation tank to the washing tank, and a rinsing cycle can be performed. Once the rinsing cycle is complete, the carbon dioxide and foreign substances in the washing tank can be discharged into the distillation tank. The above washing and rinsing cycles can be repeated several times depending on the washing machine's settings.

[0181] When the washing machine's washing cycle is complete, the laundry loaded into the washing tub (10) must be removed. Even after the washing cycle is complete, the pressure inside the washing tub (10) remains higher than atmospheric pressure. Therefore, before opening the door of the washing tub (10), the pressure must be lowered to a level equal to or similar to atmospheric pressure. The step of lowering the pressure inside the washing tub (10) in order to open the door of the washing tub (10) can be referred to as the depressurization step.

[0182] Referring to FIG. 9, in the depressurization step, the control unit (60) can open the sixth valve (106), the eighth valve (108), the ninth valve (109), the eleventh valve (111), and the first valve (101). The control unit (60) can close the third valve (103), the fifth valve (105), the fourth valve (104), the fourteenth valve (114), the seventh valve (107), the thirteenth valve (113), the tenth valve (110), and the second valve (102). The control unit (60) can operate the chiller (40). The control unit (60) can operate the pump (30).

[0183] When the second opening (12) of the washing machine (10) is opened and the sixth valve (106) is opened, carbon dioxide inside the washing tub (10) can move along the sixth branch flow path (216) to the fourth flow path connection (304).

[0184] Since the third valve (103) and the fifth valve (105) are closed, carbon dioxide can flow into the pump (30) through the filter (32) at the fourth flow connection (304). Carbon dioxide discharged from the pump (30) can move to the fifth flow connection (305).

[0185] At the fifth flow connection (305), the fourth valve (104) and the fourteenth valve (114) are closed, so that carbon dioxide can move along the ninth branch flow path (219) to the sixth flow connection (306). At the sixth flow connection (306), the seventh valve (107) is closed and the eighth valve (108) is open, so that carbon dioxide can move along the twelfth branch flow path (222) to the seventh flow connection (307).

[0186] The 12th branch flow path (222) may pass through the inside of the washing tub (10) or the outside of the washing tub (10) adjacent to the washing tub (10). The 12th branch flow path (222), through which carbon dioxide, the temperature of which has increased by passing through the pump (30), flows, may exchange heat with the carbon dioxide inside the washing tub (10) by passing through the inside of the washing tub (10) or the outside of the washing tub (10) adjacent to the washing tub (10). Hereinafter, the 12th branch flow path (222) may be referred to as a washing tub heat exchanger (222). The temperature of the carbon dioxide inside the washing tub (10) may increase due to the heat exchange, and the liquid carbon dioxide may be vaporized.

[0187] In the seventh flow connection (307), the ninth valve (109) is opened, so that carbon dioxide can move to the eighth flow connection (308). In the eighth flow connection (308), the ninth valve (109) and the thirteenth valve (113) are closed and the eleventh valve (111) is opened, so that carbon dioxide can move along the first branch flow path (211) to the first flow branch (301) through the chiller (40). Since the chiller (40) is provided in the first branch flow path (211) connecting the eighth flow connection (308) and the first flow branch (301), carbon dioxide can exchange heat with the chiller (40). By exchanging heat with the chiller (40), the temperature of carbon dioxide passing through the first branch flow path (211) is lowered, and the gaseous carbon dioxide can be liquefied.

[0188] In the first flow path connection (301), the second valve (102) is closed and the first valve (101) is open, so that carbon dioxide can move into the distillation tank (20) through the third opening (21) of the distillation tank (20). By passing through the chiller (40) provided in the first branch flow path (211), carbon dioxide can be introduced into the distillation tank (20) in a liquid state.

[0189] Through the above-described path, carbon dioxide in the washing tank (10) can be recovered to the distillation tank (20) through the filter (32), pump (30), and chiller (40). Carbon dioxide, whose temperature has increased by passing through the pump (30), can increase the temperature of the carbon dioxide inside the washing tank (10) or vaporize it by passing through the washing tank (10).

[0190] As described with reference to Fig. 8, the liquid carbon dioxide inside the washing tub (10) can be first recovered to the distillation tank (20), and then the gaseous carbon dioxide remaining in the washing tub (10) can be recovered. Therefore, the gaseous carbon dioxide inside the washing tub (10) can be recovered to the distillation tank (20) through the above process described with reference to Fig. 9. However, even at this time, not only the gaseous carbon dioxide but also the liquid carbon dioxide remaining inside the washing tub (10) can be recovered to the distillation tank (20).

[0191] Fig. 10 is a conceptual diagram for explaining a process of lowering the pressure inside a distillation tank in a washing machine according to one embodiment.

[0192] Below, the process of lowering the pressure and temperature inside the distillation tank (20) is described with reference to FIG. 10.

[0193] During the process described above, when carbon dioxide from the washing tank (10) is recovered into the distillation tank (20), the pressure and temperature inside the distillation tank (20) may rise above a set value. As described with reference to FIG. 9, if carbon dioxide from the washing tank (10) continues to flow into the distillation tank (20) through the pump (30), the pressure and temperature inside the distillation tank (20) may rise together. If this process continues, the pressure inside the distillation tank (20) may rise excessively, which may cause stability issues.

[0194] In order to control the temperature and pressure inside the distillation tank (20), the washing machine may include a second temperature sensor (72) provided to measure the temperature inside the distillation tank (20) and a second pressure sensor (74) provided to measure the pressure inside the distillation tank (20).

[0195] The control unit (60) can lower the temperature inside the distillation tank (20) through the process described below based on the temperature data received from the second temperature sensor (72). The control unit (60) can lower the pressure inside the distillation tank (20) through the process described below based on the pressure data received from the second pressure sensor (74).

[0196] Referring to Fig. 10, the control unit (60) can open the first valve (101), the eleventh valve (111), and the thirteenth valve (113). The control unit (60) can close the second valve (102), the tenth valve (110), the ninth valve (109), and the fourteenth valve (114). The control unit (60) can operate the chiller (40).

[0197] When the third opening (21) of the distillation tank (20) is opened and the first valve (101) is opened, carbon dioxide inside the distillation tank (20) can move to the first flow path connection (301). In the first flow path connection (301), since the second valve (102) is closed and the eleventh valve (111) is opened, carbon dioxide can move along the first branch flow path (211) to the eighth flow path connection (308) through the chiller (40). Since carbon dioxide flowing inside the first branch flow path (211) passes through the chiller (40), carbon dioxide inside the first branch flow path (211) can exchange heat with the chiller (40). The carbon dioxide can be lowered in temperature or liquefied by exchanging heat with the chiller (40).

[0198] Carbon dioxide that has moved to the 8th flow connection (308) can move to the 10th flow connection (310) along the 13th branch flow path (223) because the 10th valve (110) and the 9th valve (109) are closed and the 13th valve (113) is opened. In the 10th flow connection (310), the 14th valve (114) is closed, so carbon dioxide can move into the distillation tank (20) through the 4th opening (22) of the distillation tank (20).

[0199] Through the above-described path, carbon dioxide discharged from the distillation tank (20) can flow back into the distillation tank (20) via the chiller (40). The carbon dioxide passing through the chiller (40) has its temperature lowered and the gaseous carbon dioxide is liquefied, so that the temperature inside the distillation tank (20) can be lowered as the carbon dioxide passing through the chiller (40) flows into the distillation tank (20). In addition, the pressure inside the distillation tank (20) can be lowered.

[0200] Fig. 11 illustrates a control method of a washing machine according to one embodiment.

[0201] Referring to Fig. 11, when laundry is loaded into the drum inside the washing tub (10) and the door of the washing tub (10) is closed, the air inside the washing tub (10) can be discharged. (S100)

[0202] The control unit (60) can operate the vacuum pump (31). As the vacuum pump (31) operates, the inside of the washing tub (10) can be brought into a low pressure close to a vacuum.

[0203] After exhausting the air inside the washing tub (10), carbon dioxide can be supplied to the washing tub (10). (S110)

[0204] By discharging the air inside the washing tub (10), the inside of the washing tub (10) is at a low pressure close to a vacuum, so that the gaseous carbon dioxide from the distillation tank (20) can be supplied to the washing tub (10) first. For example, the gaseous carbon dioxide can be supplied to the washing tub (10) through the process described with reference to FIG. 3. In addition, the gaseous carbon dioxide can also be supplied to the washing tub (10) through the process described with reference to FIG. 5.

[0205] When the pressure inside the washing tub (10) becomes higher than a predetermined value by filling with gaseous carbon dioxide, liquid carbon dioxide can be supplied to the washing tub (10). For example, liquid carbon dioxide can be supplied to the washing tub (10) through the process described with reference to FIG. 4.

[0206] When carbon dioxide is supplied to the washing tub (10), the temperature and pressure inside the washing tub (10) can be controlled before performing washing. (S120)

[0207] The control unit (60) can lower or raise the temperature and pressure inside the washing tub (10) based on the temperature data and pressure data received from the first temperature sensor (71) and the first pressure sensor (73). For example, the temperature and pressure inside the washing tub (10) can be lowered through the process described with reference to FIG. 6, and the temperature and pressure inside the washing tub (10) can be raised through the process described with reference to FIG. 7.

[0208] After controlling the temperature and pressure inside the washing tub (10), washing can proceed. (S130) When washing, the drum can rotate for several minutes.

[0209] After the washing process is completed, the carbon dioxide in the washing tank (10) can be discharged to the distillation tank (20). (S140)

[0210] For example, carbon dioxide and foreign substances inside the washing tank (10) can be discharged to the distillation tank (20) through the process described with reference to FIG. 8.

[0211] After discharging the carbon dioxide inside the washing tank (10), the carbon dioxide from the distillation tank (20) can be supplied back to the washing tank (10). (S150)

[0212] At this time, since the inside of the washing tank (10) is already filled with gaseous carbon dioxide, liquid carbon dioxide can be supplied to the washing tank (10).

[0213] When carbon dioxide is supplied to the washing tub (10), the temperature and pressure inside the washing tub (10) can be controlled before rinsing. (160)

[0214] The control unit (60) can lower or raise the temperature and pressure inside the washing tub (10) based on the temperature data and pressure data received from the first temperature sensor (71) and the first pressure sensor (73).

[0215] After controlling the temperature and pressure inside the washing tub (10), a rinsing cycle can be performed. According to one embodiment, the washing cycle and the rinsing cycle can each be performed multiple times.

[0216] When rinsing is complete, the carbon dioxide in the washing tank (10) can be discharged to the distillation tank (20). (S180)

[0217] Before opening the washing tub (10), the pressure inside the washing tub (10) must be lowered to a level similar to atmospheric pressure, so the inside of the washing tub (10) can be depressurized. (S190)

[0218] For example, the pressure inside the washing tank (10) can be lowered through the process described with reference to Fig. 9.

[0219] According to one embodiment, a washing machine is provided to wash laundry using carbon dioxide, and includes a washing tub having a first opening and a second opening, a distillation tank configured to receive carbon dioxide and foreign substances discharged from the washing tub and vaporize carbon dioxide therein, a pump configured to move liquid carbon dioxide or gaseous carbon dioxide, a chiller disposed at one side of a passage through which carbon dioxide flows and configured to lower a temperature of carbon dioxide flowing through the passage, and a first passage connecting the second opening, the pump, the chiller, and the first opening so that carbon dioxide inside the washing tub is returned to the washing tub via the pump and the chiller.

[0220] The washing machine may further include a second passage connecting the distillation tank, the pump, and the first opening of the washing tank so that carbon dioxide inside the distillation tank moves to the washing tank via the pump.

[0221] The washing machine may further include a first valve configured to open and close the first flow path, a second valve configured to open and close the second flow path, and a control unit configured to control the first valve and the second valve.

[0222] The above control unit can lower the temperature and pressure inside the washing tub by controlling the first valve and the second valve to open the first flow path.

[0223] The above control unit can increase the temperature and pressure inside the washing tub by controlling the first valve and the second valve to open the second flow path.

[0224] The washing machine may further include a third passage connecting the distillation tank, the chiller, and the first opening of the washing tank.

[0225] The third euro can branch off from the second euro at a point on the second euro and join the first euro at a point on the first euro.

[0226] The washing machine may further include a replenishment tank provided to replenish carbon dioxide to the washing tub.

[0227] The above supplementary tank is connected to the upstream side of the pump of the second flow path, thereby supplying carbon dioxide to the washing tank through the second flow path.

[0228] The washing machine may further include a fourth passage connecting the second opening of the washing tub, the pump, and the distillation tank.

[0229] The above fourth flow path can branch in one direction from the downstream side of the pump of the above first flow path to connect the downstream side of the pump and the distillation tank.

[0230] The washing machine may further include a fifth passage connecting the second opening of the washing tub, the pump, the chiller, and the distillation tank.

[0231] The above fifth flow can branch off in another direction from the downstream side of the pump of the above first flow to connect the downstream side of the pump, the chiller, and the distillation tank.

[0232] The above fifth euro may further include a washing tank heat exchanger provided to pass through the washing tank.

[0233] The above washing machine heat exchanger may be provided between the downstream side of the pump and the chiller.

[0234] The above distillation tank may include a third opening and a fourth opening.

[0235] The above fourth flow can connect the downstream side of the pump and the fourth opening.

[0236] The above fifth flow can connect the third opening through the chiller from the downstream side of the pump.

[0237] The washing machine may further include a sixth passage connecting the third opening of the distillation tank, the chiller, and the fourth opening of the distillation tank.

[0238] The washing machine may further include a filter provided on the upstream side of the pump to prevent foreign substances larger than a predetermined size from entering the pump.

[0239] The washing machine may further include a heater disposed adjacent to the distillation tank to increase the temperature inside the distillation tank.

[0240] The washing machine may further include a first temperature sensor configured to measure a temperature inside the washing tub and a first pressure sensor configured to measure a pressure inside the washing tub.

[0241] The washing machine may further include a second temperature sensor configured to measure a temperature inside the distillation tank and a second pressure sensor configured to measure a pressure inside the distillation tank.

[0242] A method for controlling a washing machine including a washing tank, a distillation tank, a pump, and a chiller according to one embodiment is provided, which discharges air inside the washing tank, supplies carbon dioxide to the washing tank, controls the temperature and pressure inside the washing tank, performs washing, discharges carbon dioxide in the washing tank to the distillation tank, supplies carbon dioxide to the washing tank, controls the temperature and pressure inside the washing tank, performs rinsing, discharges carbon dioxide in the washing tank to the distillation tank, and depressurizes the inside of the washing tank.

[0243] When exhausting air inside the washing tank and supplying carbon dioxide to the washing tank, liquid carbon dioxide can be supplied after supplying gaseous carbon dioxide.

[0244] When controlling the temperature and pressure inside the washing tank, the temperature and pressure inside the washing tank can be lowered by passing the carbon dioxide inside the washing tank through the pump and the chiller and then returning it to the washing tank, and the temperature and pressure inside the washing tank can be increased by supplying the carbon dioxide inside the distillation tank to the washing tank through the pump.

[0245] When the inside of the washing tank is depressurized, carbon dioxide discharged from the washing tank can be passed through the pump and then heat-exchanged with the carbon dioxide inside the washing tank, and carbon dioxide that has exchanged heat with the carbon dioxide inside the washing tank can be passed through the chiller and then recovered in the distillation tank.

[0246] According to the present disclosure, even in a two-tank washing machine including a washing tank (10) and a distillation tank (20) and not including a separate carbon dioxide storage tank, the temperature and pressure inside the washing tank (10) can be controlled prior to the washing or rinsing step. This prevents damage to laundry and ensures the stability of the washing tank (10), which is a pressure vessel.

[0247] According to the present disclosure, in the washing machine having the above-described two-tank structure, the temperature and pressure inside the washing tank (10) as well as the distillation tank (20) can be controlled. Through this, the stability of the distillation tank (20), which is a pressure vessel, can be secured.

[0248] The above illustrates and describes specific embodiments. However, the invention is not limited to the above-described embodiments, and those skilled in the art will readily appreciate that various modifications and implementations can be made without departing from the spirit and scope of the invention as set forth in the claims below.

Claims

1. A washing tank having a first opening and a second opening; A pump designed to move liquid carbon dioxide or gaseous carbon dioxide; chiller; and A washing machine including a first passage connecting the second opening, the pump, the chiller, and the first opening, so that carbon dioxide moved by the pump passes through the second opening from inside the washing tub, passes through the chiller to be cooled by the chiller, and then returns to the washing tub through the first opening.

2. In paragraph 1, distillation tank; and A washing machine further comprising a second passage connecting the distillation tank, the pump, and the first opening, so that carbon dioxide moved by the pump passes through the pump from inside the distillation tank and then moves to the washing tank through the first opening.

3. In paragraph 2, A first valve provided to open and close the first euro; A second valve provided to open and close the second euro; and further comprising a control unit; The above control unit, The first valve and the second valve are controlled to open the first flow path and close the second flow path so that the carbon dioxide moved by the pump passes through the pump along the first flow path at a first temperature and a first pressure from inside the washing tub through the second opening, and then passes through the chiller and returns into the washing tub through the first flow path at a second temperature lower than the first temperature and a second pressure lower than the first pressure. A washing machine that controls the first valve and the second valve to open the second path and close the first path so that the carbon dioxide moved by the pump passes through the pump along the second path from inside the distillation tank at a third temperature and a third pressure, and then moves into the washing tank through the first opening along the second path at a fourth temperature higher than the third temperature and a fourth pressure higher than the third pressure.

4. In paragraph 2, A heater provided to heat the distillation tank; and A third passage connecting the distillation tank, the chiller, and the first opening so that carbon dioxide heated by the heater passes through the chiller from inside the distillation tank to be cooled by the chiller, and then moves to the washing tank through the first opening; further comprising; A washing machine in which the third euro branches off from the second euro at a point on the second euro and joins the first euro at a point on the first euro.

5. In paragraph 2, Including a supplementary tank; A washing machine in which the replenishment tank is connected to the upstream side of the pump in the second passage so that carbon dioxide moved by the pump passes through the pump along the second passage from the inside of the replenishment tank and then moves to the washing tub through the first opening along the second passage.

6. In paragraph 4, Further comprising a fourth passage connecting the second opening, the pump, and the distillation tank so that carbon dioxide moved by the pump passes through the second opening from inside the washing tank and then moves to the distillation tank; The above fourth euro is a washing machine branched from the downstream side of the pump of the above first euro.

7. In paragraph 5, Further comprising a fifth passage connecting the second opening of the washing tank, the pump, the chiller and the distillation tank so that carbon dioxide moved by the pump passes through the second opening from inside the washing tank and then moves to the distillation tank via the chiller; The above fifth euro is a washing machine branched from the downstream side of the pump of the above first euro.

8. In paragraph 7, Including a washing machine heat exchanger; The fifth path is a washing machine that connects the second opening, the pump, the washing tank heat exchanger, and the distillation tank so that the carbon dioxide moved by the pump passes through the second opening from inside the washing tank, the pump, and then moves to the distillation tank through the washing tank heat exchanger to exchange heat with the carbon dioxide inside the washing tank.

9. In paragraph 7, The above distillation tank comprises a third opening and a fourth opening, The washing machine in which the fifth euro connects the third opening through the chiller from the downstream side of the pump.

10. In paragraph 6, The above distillation tank comprises a third opening and a fourth opening, The above fourth euro is a washing machine connecting the downstream side of the pump and the fourth opening.

11. In paragraph 9, A washing machine further comprising a sixth passage connecting the third opening, the chiller, and the fourth opening, so that carbon dioxide cooled by the chiller passes through the chiller at a fifth temperature and a fifth pressure from inside the distillation tank through the third opening, and then moves to the distillation tank through the fourth opening at a sixth temperature lower than the fifth temperature and a sixth pressure lower than the fifth pressure.

12. In paragraph 1, A washing machine further comprising a filter provided on the upstream side of the pump to prevent foreign substances larger than a predetermined size from flowing into the pump.

13. In paragraph 4, A washing machine further comprising a heater adjacent to the distillation tank, the heater being arranged to increase the temperature inside the distillation tank.

14. In paragraph 1, A first temperature sensor provided to measure the temperature inside the washing tank; and A washing machine further comprising: a first pressure sensor configured to measure pressure inside the washing tub; 15. In paragraph 13, A second temperature sensor provided to measure the temperature inside the distillation tank; and A washing machine further comprising a second pressure sensor configured to measure the pressure inside the distillation tank.

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