Water purifier

Abstract

This water purifier includes: a raw water channel; a filter provided to filter water introduced from the raw water channel; a purified water channel for discharging water having passed through the filter; a drainage channel provided to discharge water discharged from the filter through a wastewater channel of the filter; a resistance valve provided to reduce a flow rate of the drainage channel; a first connection channel for connecting the raw water channel and the downstream side of the resistance valve of the drainage channel; a second connection channel for connecting the purified water channel and the upstream side of the resistance valve of the drainage channel; and a tank disposed on the second connection channel. When the filter is washed, the water stored in the tank is introduced into the filter via the upstream side of the resistance valve of the drainage channel, and the water discharged from the filter via the inside of the filter is discharged to the outside via the raw water channel, the first connection channel, and the downstream side of the resistance valve of the drain channel.

Description

water purifier

[0001] The present disclosure relates to a water purifier, and more particularly, to a water purifier having a washable filter.

[0002] Typically, a water purifier is a device that filters incoming water through one or more filters, providing clean water to the user. These filters filter out various contaminants, and these contaminants can accumulate inside the filter. This can reduce the filter's filtration performance or impede water flow, preventing the user from achieving the desired purified water volume. Furthermore, microorganisms introduced along with the contaminants can multiply using the organic matter within the filter as nutrients, causing unpleasant odors and impurities in the purified water. Replacing the filter with a new one is both inconvenient and expensive for the user.

[0003] One aspect of the present disclosure provides a water purifier comprising a filter including a wastewater path, wherein the filter is washable.

[0004] One aspect of the present disclosure provides a water purifier capable of cleaning a filter without disassembling the filter through control of components.

[0005] One aspect of the present disclosure provides a water purifier capable of selectively washing a filter with a short replacement cycle among a plurality of filters.

[0006] One aspect of the present disclosure provides a water purifier capable of washing a filter at a relatively high flow rate without passing through a resistance valve.

[0007] 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.

[0008] A water purifier according to the invention comprises: a raw water channel provided to receive external water and including at least one valve; a filter provided to filter water flowing in from the raw water channel and including a waste water channel therein; a purified water channel provided to discharge water passing through the filter to the outside and including at least one valve; a drainage channel connected to the waste water channel of the filter and provided to discharge water discharged from the filter through the waste water channel and including at least one valve; a resistance valve disposed on the drainage channel and provided to reduce a flow rate of the drainage channel; a first connection channel connecting the raw water channel and a downstream side of the resistance valve of the drainage channel and including at least one valve; a second connection channel connecting the purified water channel and an upstream side of the resistance valve of the drainage channel and including at least one valve; and a tank provided to store water passing through the filter and disposed on the second connection channel. When washing the filter, water stored in the tank is arranged to flow into the filter through the upstream side of the resistance valve of the drainage channel, and water discharged from the filter through the inside of the filter is arranged to be discharged to the outside through the raw water channel, the first connection channel, and the downstream side of the resistance valve of the drainage channel.

[0009] A water purifier according to the invention comprises: a raw water channel through which water flows in from the outside and includes at least one valve; a filter configured to filter water flowing in from the raw water channel and including a waste water channel therein; a purified water channel configured to discharge water passing through the filter to the outside and including at least one valve; a drain channel connected to the waste water channel of the filter and configured to discharge water discharged from the filter through the waste water channel and including at least one valve; a resistance valve disposed on the drain channel and configured to reduce a flow rate of the drain channel; a first connection channel connecting the raw water channel and an upstream side of the resistance valve of the drain channel and including at least one valve; and a second connection channel connecting the raw water channel and the drain channel by bypassing the first connection channel and including at least one valve, the second connection channel connecting a downstream side of a branch point of the first connection channel on the raw water channel and a downstream side of the resistance valve of the drain channel. When washing the filter, water from the raw water path flows into the filter through the first connection path and the upstream side of the resistance valve of the drain path, and water discharged from the filter through the inside of the filter is discharged to the outside through the raw water path, the second connection path, and the downstream side of the resistance valve of the drain path.

[0010] Fig. 1 is a drawing showing a water purifier according to one embodiment.

[0011] FIG. 2 is a drawing showing the flow of water in a water purifier when supplying purified water in a water purifier according to one embodiment.

[0012] FIG. 3 is a drawing showing the flow of water in a water purifier when supplying water to a tank in a water purifier according to one embodiment.

[0013] FIG. 4 is a drawing showing the flow of water in a water purifier when cleaning a filter according to one embodiment.

[0014] Fig. 5 is a diagram showing control configurations of a water purifier according to one embodiment.

[0015] Fig. 6 is a table showing a control method of valves and pumps according to each mode in a water purifier according to one embodiment.

[0016] FIG. 7 is a drawing illustrating the flow of water inside a filter when supplying purified water in a water purifier according to one embodiment.

[0017] FIG. 8 is a drawing illustrating the flow of water inside a filter when cleaning the filter in a water purifier according to one embodiment.

[0018] Fig. 9 is a drawing showing a water purifier according to one embodiment.

[0019] FIG. 10 is a drawing showing the flow of water in a water purifier when supplying purified water in a water purifier according to one embodiment.

[0020] FIG. 11 is a drawing showing the flow of water in a water purifier when discharging residual water according to one embodiment.

[0021] Fig. 12 is a drawing showing the flow of water in a water purifier when cleaning a filter according to one embodiment.

[0022] Fig. 13 is a drawing showing control configurations of a water purifier according to one embodiment.

[0023] Fig. 14 is a table showing a control method of valves according to each mode in a water purifier according to one embodiment.

[0024] 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.

[0025] In connection with the description of the drawings, similar reference numerals may be used for similar or related components.

[0026] 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.

[0027] 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.

[0028] The term “and / or” includes any combination of a plurality of related described elements or any one of a plurality of related described elements.

[0029] 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).

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Meanwhile, the terms “front”, “back”, “left”, “right”, “up”, “down”, etc. used in the description below are defined based on the drawing, and the shape and position of each component are not limited by these terms.

[0035] Fig. 1 is a drawing showing a water purifier according to one embodiment.

[0036] Referring to FIG. 1, a water purifier (1) may include a raw water passage (110) through which water flows in from the outside, a filter (200) provided to filter the water flowing in from the raw water passage (110), and a purified water passage (120) for discharging water that has passed through the filter (200) to the outside. Water flowing into the water purifier (1) from the outside may be referred to as raw water, and water filtered by the filter (200) may be referred to as purified water. However, hereinafter, raw water and purified water are referred to as water without distinction.

[0037] A filter (200) may be placed on the raw water path (110). A raw water valve (10) may be placed on the raw water path (110). The raw water valve (10) may be placed upstream of the filter (200). As the raw water valve (10) opens and closes, water in the raw water path (110) may or may not flow into the filter (200).

[0038] The water purification path (120) can be connected to the filter (200). Water that flows from the raw water path (110) into the filter (200) and is filtered by the filter (200) can flow into the water purification path (120). A water discharge valve (30) can be arranged on the water purification path (120). As the water discharge valve (30) opens and closes, water in the water purification path (120) can be discharged or not discharged outside the water purifier (1).

[0039] The raw water flow path (110) can be connected to the raw water inlet (200a) of the filter (200) to be described later. The purified water flow path (120) can be connected to the purified water outlet (200b) of the filter (200) to be described later.

[0040] The filter (200) may include a membrane filter (210), a pre-filter (220) positioned upstream from the membrane filter (210), and a post-filter (230) positioned downstream from the membrane filter (210).

[0041] The pre-filter (220) may include at least one of a sediment filter, a high turbidity filter, a carbon filter, a reverse osmosis filter, a micro filtration filter, a nano filtration filter, and similar filters, but is not limited thereto. The post-filter (230) may include at least one of a sediment filter, a high turbidity filter, a carbon filter, a reverse osmosis filter, a micro filtration filter, a nano filtration filter, and similar filters, but is not limited thereto.

[0042] According to one embodiment, the filter (200) may include a wastewater path therein. The wastewater path may refer to a path for discharging water that has entered the interior of the filter (200) but has not passed through the pre-filter (220), membrane filter (210), and post-filter (230) to the outside of the filter (200). The water in the wastewater path may be discharged to the outside of the filter (200) through a wastewater outlet (200c) of the filter (200), which will be described later.

[0043] The water purifier (1) may include a drainage channel (130) connected to the wastewater channel of the filter (200). The drainage channel (130) may be provided to discharge water discharged from the filter (200) through the wastewater channel to the outside of the water purifier (1).

[0044] The water purifier (1) may include a resistance valve (90) disposed on a drainage channel (130). The resistance valve (90) may be configured to reduce the flow rate of the drainage channel (130). The resistance valve (90) may have a passive configuration (see FIG. 5) that is not controlled by a control unit (300) to be described later, and may be configured to allow only a portion of the water upstream of the resistance valve (90) to pass downstream of the resistance valve (90). Therefore, the flow rate downstream of the resistance valve (90) may be relatively low.

[0045] The water purifier (1) may include a drain valve (20) arranged downstream of a resistance valve (90) on a drainage path (130). The drain valve (20) may be arranged between the connection point (101) of the raw water path and the first connection path and the resistance valve (90).

[0046] The water purifier (1) may include a first connecting passage (140) connecting the raw water passage (110) and the downstream side (133) of the resistance valve of the drain passage (130). A cleaning valve (50) may be arranged on the first connecting passage (140).

[0047] The water purifier (1) may include a second connecting passage (150) connecting the water purification passage (120) and the upstream side (131, 132) of the resistance valve of the drain passage. A tank (60) may be arranged on the second connecting passage (150). The tank (60) may be provided to store water that has passed through the filter (200).

[0048] According to the present disclosure, the tank (60) may be provided to store water for washing the filter (200). The tank (60) may not be provided to store water for drinking by a user. Although not illustrated in FIG. 1, the water purifier (1) may include a storage tank positioned downstream of the connection point (102) between the purified water passage and the second connection passage (150). The storage tank may be provided to store water for drinking by a user. In other words, although FIG. 1 illustrates a direct water purifier, it may also be provided as, for example, a tank-type water purifier.

[0049] The outlet valve (30) may be positioned downstream of the connection point (102) between the water purification flow path and the second connection flow path (150) on the water purification flow path (120). In other words, the outlet valve (30) may be positioned downstream of the branch point (102) of the second connection flow path of the water purification flow path (120).

[0050] The water purifier (1) may include a tank valve (40) positioned upstream of the tank (60) on the second connection path (150). The water purifier (1) may include a pump (70) positioned downstream of the tank (60) on the second connection path (150). The water purifier (1) may include a check valve (80) positioned downstream of the pump (70) on the second connection path (150).

[0051] The tank valve (40) can supply water to the tank (60) or block the water supply by opening and closing.

[0052] The pump (70) may be arranged to move water inside the tank (60) to the filter (200). The pump (70) may operate to pump water in the tank (60) and move it to the filter (200).

[0053] The check valve (80) can allow water discharged from the pump (70) to move to the downstream side of the check valve (80). The check valve (80) can block water in the drainage path (130) from moving to the upstream side of the check valve (80). Therefore, the check valve (80) can block water in the drainage path (130) from flowing into the pump (70) located on the upstream side of the check valve (80).

[0054] FIG. 2 is a drawing showing the flow of water in a water purifier when supplying purified water in a water purifier according to one embodiment.

[0055] Referring to Fig. 2, the flow of water in the water purifier (1) when supplying purified water is described.

[0056] Purified water supply may mean that water that has entered the filter (200) through the raw water path (110) is filtered by the filter (200) and then supplied to the user through the purified water path (120) and the outlet valve (30). This may be referred to as purified water supply mode.

[0057] When supplying purified water, the raw water valve (10) can be opened. As the raw water valve (10) is opened, water in the raw water path (111) on the upstream side of the raw water valve (10) can move to the raw water path (112) on the downstream side of the raw water valve (10) and flow into the filter (200). The cleaning valve (50) can be closed to prevent water from flowing into the first connection path (140).

[0058] Water passing through the filter (200) can be supplied to the user through the water outlet valve (30) via the purified water passage (120). The water outlet valve (30) can be opened so that water in the purified water passage (120) can pass through the water outlet valve (30). The tank valve (40) can be closed so that water does not flow into the second connection passage (150).

[0059] Water discharged through the wastewater path of the filter (200) to the drain path (130) can be discharged outside the water purifier (1). In this case, discharge outside the water purifier (1) does not mean supplying it to the user.

[0060] Water flowing into the drainage channel (131) through the wastewater channel can be discharged outside the water purifier (1) through the connection point (103) of the drainage channel and the second connection channel, the resistance valve (90), the drain valve (20), and the connection point (104) of the drainage channel and the first connection channel. The water flowing into the drainage channel (131) is prevented from flowing into the second connection channel (150) by the check valve (80). The drain valve (20) can be opened so that the water passing through the resistance valve (90) is discharged outside the water purifier (1) through the connection point (104) of the drainage channel and the first connection channel and through the downstream side of the drainage channel (134). As described above, since the cleaning valve (50) is closed, the water passing through the connection point (104) of the drainage channel and the first connection channel does not flow into the first connection channel (140).

[0061] FIG. 3 is a drawing showing the flow of water in a water purifier when supplying water to a tank in a water purifier according to one embodiment.

[0062] Referring to Fig. 3, the flow of water in the water purifier (1) when supplying water to the tank is described.

[0063] Supplying water to the tank may mean storing water inside the tank (60) through the purified water passage (120) and the second connection passage (150) after filtering water that has entered the filter (200) through the raw water passage (110) in the filter (200). When supplying water to the tank, residual water on the purified water passage (120) can be discharged, so that water supply to the tank and residual water discharge can be performed simultaneously. This may be referred to as a tank supply mode.

[0064] When supplying water to the tank, the raw water valve (10) can be opened. As the raw water valve (10) is opened, water in the raw water path (111) on the upstream side of the raw water valve (10) can move to the raw water path (112) on the downstream side of the raw water valve (10) and flow into the filter (200). The cleaning valve (50) can be closed to prevent water from flowing into the first connection path (140).

[0065] Water passing through the filter (200) can flow into the second connection path (150) via the water purification path (120). The water discharge valve (30) can be closed to prevent water from being discharged outside the water purifier (1) through the water discharge valve (30). The tank valve (40) can be opened to allow water to flow into the second connection path (150).

[0066] Water discharged through the wastewater path of the filter (200) to the drain path (130) can be discharged outside the water purifier (1). Discharge outside the water purifier (1) does not mean supplying it to the user.

[0067] Water flowing into the drainage channel (131) through the wastewater channel can be discharged outside the water purifier (1) through the connection point (103) of the drainage channel and the second connection channel, the resistance valve (90), the drain valve (20), and the connection point (104) of the drainage channel and the first connection channel. The water flowing into the drainage channel (131) is prevented from flowing into the second connection channel (150) by the check valve (80). The drain valve (20) can be opened so that the water passing through the resistance valve (90) is discharged outside the water purifier (1) through the connection point (104) of the drainage channel and the first connection channel and through the downstream side of the drainage channel (134). As described above, since the cleaning valve (50) is closed, the water passing through the connection point (104) of the drainage channel and the first connection channel does not flow into the first connection channel (140).

[0068] FIG. 4 is a drawing showing the flow of water in a water purifier when cleaning a filter according to one embodiment.

[0069] Referring to Fig. 4, the flow of water in the water purifier (1) when washing the filter is described.

[0070] According to one embodiment, filter washing may mean washing the filter (200) by allowing water stored in the tank (60) to flow in the reverse direction, and then discharging the filter (200) to the outside of the water purifier (1) through the raw water passage (110), the first connection passage (140), and the drain passage (130). When supplying purified water, water is supplied into the filter (200) through the raw water passage (110), but when washing the filter, water may be discharged to the outside of the filter (200) through the raw water passage (110). Therefore, this is called back washing. This may be referred to as a filter washing mode.

[0071] In one embodiment, the raw water valve (10) may be closed during filter washing, as the filter (200) is reversely washed using water stored in the tank (60).

[0072] The pump (70) can be operated to supply water inside the tank (60) to the filter (200). The water inside the tank (60) can be introduced into the filter (200) through the drainage path (130) via the check valve (80) and the connection point (103) between the drainage path and the second connection path by the pump (70). The drain valve (20) can be closed so that the water inside the tank (60) does not flow toward the resistance valve (90). Due to the resistance of the resistance valve (90) and the closing of the drain valve (20), the water inside the tank (60) can flow to the upstream side (131) of the drainage path (130) instead of flowing to the downstream side (132) of the drainage path (130).

[0073] As described later, when water flows into the filter (200) through the drainage path (130), it can flow into the filter (200) through the wastewater outlet (200c). The water flowing into the filter (200) can be discharged to the outside of the filter (200) through the raw water inlet (200a) after backwashing the filter (200).

[0074] Water discharged outside the filter (200) through the raw water inlet (200a) can flow into the raw water passage (110). Since the outlet valve (30) and the tank valve (40) are closed, the water discharged outside the filter (200) may not flow into the purified water passage (120). The water flowing into the raw water passage (110) can flow into the first connection passage (140) through the connection point (101) of the raw water passage and the first connection passage. Since the raw water valve (10) is closed, water does not flow to the upstream side (111) of the raw water passage. The cleaning valve (50) can be opened so that the water in the first connection passage (140) can flow into the drain passage (130). The water in the first connection channel (140) can be discharged outside the water purifier (1) through the connection point (104) of the drain channel and the first connection channel and the downstream side (134) of the drain channel (130). As described above, since the drain valve (20) is closed, the water in the first connection channel (140) may not flow toward the resistance valve (90) at the connection point (104) of the drain channel and the first connection channel.

[0075] Referring to FIGS. 2 and 4, the direction of movement of water flowing through the raw water path (110) during purified water supply and the direction of movement of water flowing through the raw water path (110) during filter cleaning may be opposite to each other. More specifically, the direction of movement of water flowing through the downstream side (112) of the raw water path (110) during purified water supply may be opposite to the direction of movement of water flowing through the downstream side (112) of the raw water path (110) during filter cleaning.

[0076] Referring to FIGS. 2 and 4, the direction of movement of water flowing through the drainage channel (130) when supplying purified water and the direction of movement of water flowing through the drainage channel (130) when cleaning the filter may be opposite to each other. More specifically, the direction of movement of water flowing through the upstream side (131) of the drainage channel (130) when supplying purified water may be opposite to the direction of movement of water flowing through the upstream side (131) of the drainage channel (130) when cleaning the filter.

[0077] Fig. 5 is a diagram showing control configurations of a water purifier according to one embodiment.

[0078] The water purifier (1) may include a power supply unit (160), a user interface (170), a sensor (180), and a control unit (300). The user interface (170) may include various circuits, and the control unit (300) may include processing circuits. In addition, the water purifier (1) may include a raw water valve (10), a drain valve (20), a tank valve (40), a cleaning valve (50), a water outlet valve (30), and a pump (70).

[0079] The components of the water purifier (1) are not limited to those illustrated. Some of the illustrated components may be omitted, or other components may be added. For example, the water purifier (1) may further include a communication device including various communication circuitry for communicating with external devices.

[0080] The control unit (300) can be electrically connected to components of the water purifier (1) and can control the operation of the water purifier (1). The control unit (300) can include a memory (310) and a processor (320). The processor (320) can include processing circuitry. The memory (310) can store / remember various information necessary for the operation of the water purifier (1). The memory (310) can store instructions, applications, data, and / or programs necessary for the operation of the water purifier (1). The memory (310) can include a volatile memory such as a static random access memory (S-RAM) or a dynamic random access memory (D-RAM) for temporarily storing data. Additionally, the memory (310) may include non-volatile memory such as ROM (Read Only Memory), EPROM (Erasable Programmable Read Only Memory), or EEPROM (Electrically Erasable Programmable Read Only Memory) for long-term storage of data.

[0081] The processor (320) may include various processing circuits and may generate control signals for controlling the operation of the water purifier (1) based on instructions, applications, data, and / or programs stored in the memory (310). The processor (320) may be hardware and may include logic circuits and arithmetic circuits. The processor (320) may process data according to programs and / or instructions provided from the memory (310) and generate control signals according to the processing results. The memory (310) and the processor (320) may be implemented as one control circuit or as multiple circuits. The processor (320) according to one embodiment of the present disclosure may include various processing circuits and / or multiple processors. For example, as used in this description, including the claims, the term “processor” may include various processing circuits including at least one processor, wherein one or more of the at least one processor may be configured to perform various functions described in this description in an individually and / or collectively distributed manner. When "processor," "at least one processor," and "one or more processors" are described herein as being configured to perform multiple functions, these terms may include, but are not limited to, situations where one processor performs some of the recited functions and another processor performs other of the recited functions, and situations where a single processor can perform all of the recited functions. Furthermore, the at least one processor may include a combination of processors that perform various recited and disclosed functions, for example, in a distributed manner. At least one processor may execute program instructions to achieve or perform various functions.

[0082] The power supply unit (160) is connected to an external power source and can obtain power required for the operation of the water purifier (1). The power supply unit (160) can provide power to electronic components included in the water purifier (1). The power supply unit (160) can include a power circuit and be electrically connected to a control unit (300). The control unit (300) can control the power supply unit (160) and distribute power required for components of the water purifier (1).

[0083] The user interface (170) may include various user interface circuits, and may include, for example, a display that displays information regarding the status and / or operation of the water purifier (1). The user interface (170) may include an input interface for obtaining user input. In addition, the user interface (170) may also include a speaker for outputting sound.

[0084] The display may be, for example, but is not limited to, an LCD panel (Liquid Crystal Display Panel), an LED panel (Light Emitting Diode Panel), an OLED panel (Organic Light Emitting Diode Panel), or a micro LED panel. The display device may also be a touch display.

[0085] The user interface (170) may include various buttons. For example, the input interface may include a water purification button, a water purification stop button, a cold water button, a hot water button, a continuous water dispensing button, and / or a filter cleaning button. A start or restart command for the water purification operation may be input through the water purification button. A stop command for the water purification operation may be input through the water purification stop button. A continuous water dispensing command for the water purification operation may be input through the continuous water dispensing button. A filter cleaning command may be input through the filter cleaning button.

[0086] The user interface (170) can transmit an electrical signal corresponding to user input to the control unit (300).

[0087] The sensor (180) may include at least one of a flow sensor, an electrical conductivity sensor, and a turbidity sensor. The flow sensor may measure the amount of purified water discharged from the filter (200). The flow sensor may transmit an electrical signal and / or data corresponding to the measured flow rate to the control unit (300). The electrical conductivity sensor may measure the electrical conductivity of purified water discharged from the filter (200). The electrical conductivity sensor may transmit an electrical signal and / or data corresponding to the measured electrical conductivity to the control unit (300). The turbidity sensor may measure the turbidity of purified water discharged from the filter (200). The turbidity sensor may transmit an electrical signal and / or data corresponding to the measured turbidity to the control unit (300).

[0088] Fig. 6 is a table showing a control method of valves and pumps according to each mode in a water purifier according to one embodiment.

[0089] Referring to FIGS. 2 to 4 and FIG. 6, the control of valves and pumps in the purified water supply mode, the tank supply mode and the filter cleaning mode will be described.

[0090] Referring to FIGS. 2 and 6, when supplying purified water, the control unit (300) can control to open the raw water valve (10), the drain valve (20), and the outlet valve (30). The control unit (300) can control to close the tank valve (40) and the cleaning valve (50). The control unit (300) can control to prevent the pump (70) from operating.

[0091] Based on the control of the above-described control unit (300), water from the raw water path (110) can pass through the filter (200) and then be discharged outside the water purifier (1) through the discharge valve (30). The water discharged outside the water purifier (1) through the discharge valve (30) can be supplied to the user.

[0092] Referring to FIGS. 3 and 6, when supplying water to the tank, the control unit (300) can control to open the raw water valve (10), the drain valve (20), and the tank valve (40). The control unit (300) can control to close the water outlet valve (30) and the cleaning valve (50). The control unit (300) can control to prevent the pump (70) from operating.

[0093] Based on the control of the above-described control unit (300), water in the raw water path (110) can be supplied to the tank (60) after passing through the filter (200). Additionally, residual water in the purified water path (120) can be supplied to the tank (60).

[0094] Referring to FIGS. 4 and 6, when cleaning the filter, the control unit (300) can control the pump (70) to operate. The control unit (300) can control the cleaning valve (50) to open. The control unit (300) can control the raw water valve (10), the drain valve (20), the tank valve (40), and the outlet valve (30) to close.

[0095] Based on the control of the above-described control unit (300), the water stored in the tank (60) can be discharged to the outside of the water purifier (1) through the raw water passage (110), the first connection passage (140), and the drain passage (130) after backwashing the filter (200) through the second connection passage (150) and the drain passage (130).

[0096] FIG. 7 is a drawing illustrating the flow of water inside a filter when supplying purified water in a water purifier according to one embodiment.

[0097] Referring to Fig. 7, the structure of a filter (200) of a water purifier according to one embodiment will be described. In addition, the flow of water inside the filter (200) when supplying purified water will be described.

[0098] Referring to FIG. 7, a filter (200) according to one embodiment may include a plurality of filters (210, 220, 230). For example, the plurality of filters (210, 220, 230) may include a membrane filter (210), a pre-filter (220), and a post-filter (230).

[0099] The filter (200) may include a filter housing (201) configured to accommodate a plurality of filters (210, 220, 230) therein. According to one embodiment, the filter (200) may include an integrated filter that accommodates a plurality of filters (210, 220, 230), including a membrane filter (210), within one filter housing (201). However, the present invention is not limited thereto. The filter (200) may also include a membrane filter housing that accommodates the membrane filter (210), a pre-filter housing that accommodates the pre-filter (220), and a post-filter housing that accommodates the post-filter (230).

[0100] According to one embodiment, the filter (200) may include a filter case (202) provided inside a filter housing (201).

[0101] The filter case (202) may cover a portion of the plurality of filters (210, 220, 230) and may not cover the bottom of the plurality of filters (210, 220, 230). In addition, a space may be formed between the bottom surfaces of the plurality of filters (210, 220, 230) and the filter housing (201).

[0102] The filter case (202) may include an outer case (204) provided to surround the outer surfaces of a plurality of filters (210, 220, 230) and an upper case (203) provided on the upper ends of the plurality of filters (210, 220, 230). However, the present invention is not limited thereto. For example, the filter case (202) may be configured by adding members other than the outer case (204) and the upper case (203).

[0103] The filter case (202) can block the flow of fluid by covering the outer surface and the upper surface of the plurality of filters (210, 220, 230). The filter case (202) can prevent water filtered by the plurality of filters (210, 220, 230) from flowing out of the outer surface or the upper surface of the filter case (202), thereby minimizing or reducing the loss of flow rate.

[0104] The filter (200) may include a raw water inlet (200a) provided to allow water to flow in from a raw water path (110), a purified water outlet (200b) provided to discharge water that has passed through a plurality of filters (210, 220, 230), and a waste water outlet (200c) provided to discharge water from a waste water path (200f) inside the filter (200).

[0105] When supplying purified water, water from the raw water path (110) can flow into the filter (200) through the raw water inlet (200a). Water flowing into the filter (200) through the raw water inlet (200a) can flow into a plurality of filters (210, 220, 230) through the first path (200d).

[0106] Water in the first flow path (200d) can flow into the pre-filter (220). Water that does not pass through the pre-filter (220) can move to the bottom of the membrane filter (210) and flow into the bottom of the membrane filter (210). A portion of the water that passes through the pre-filter (220) can pass through the membrane filter (210) and flow into the post-filter (230) located inside the membrane filter (210). Water that does not pass through the membrane filter (210) can flow to the top of the membrane filter (210). A portion of the water that flows into the bottom of the membrane filter (210) can flow into the post-filter (230), and the remaining portion can flow to the top of the membrane filter (210).

[0107] The post filter (230) may be placed inside the purified water discharge pipe (206) located at the center of the filter (200). Water may flow into the post filter (230) inside the purified water discharge pipe (206) through the through hole (205) of the purified water discharge pipe (206). Water passing through the post filter (230) may be discharged to the outside of the filter (200) through the purified water outlet (200b) via the second flow path (200e).

[0108] Water that does not pass through the membrane filter (210) and moves to the top of the membrane filter (210) can be discharged to the outside of the filter (200) through the wastewater outlet (200c) via the third flow path (200f). The flow path from the bottom of the membrane filter (210) to the top of the membrane filter (210) and the third flow path (200f) may be collectively referred to as a wastewater flow path. The wastewater flow path may refer to a flow path that connects water that does not pass through the membrane filter (210) to the wastewater outlet (200c). The wastewater flow path may refer to a flow path for discharging water that does not pass through the membrane filter (210) among the water that flows into the filter (200) to the outside through the wastewater outlet (200c).

[0109] Water flowing into the membrane filter (210) from the pre-filter (220) or flowing into the bottom of the membrane filter (210) flows into the third channel (200f) through the top of the membrane filter (210), and can be discharged outside the filter (200) through the wastewater outlet (200c) via the third channel (200f).

[0110] FIG. 8 is a drawing illustrating the flow of water inside a filter when cleaning the filter in a water purifier according to one embodiment.

[0111] Referring to Fig. 8, when cleaning the filter, water from the drainage channel (130) can flow into the filter (200) through the wastewater outlet (200c). The direction of movement of water in the third channel (200f) when cleaning the filter can be opposite to the direction of movement of water in the third channel (200f) when supplying purified water. Hereinafter, the direction of movement of water opposite to the direction of movement of water when supplying purified water is referred to as the reverse direction.

[0112] Water flowing into the third channel (200f) through the wastewater outlet (200c) can flow into the upper part of the membrane filter (210). The water flowing into the upper part of the membrane filter (210) can wash the membrane filter (210). A portion of the water flowing into the upper part of the membrane filter (210) can flow into the pre-filter (220), and the remaining portion can move to the lower part of the membrane filter (210). The water flowing into the pre-filter (220) can wash the pre-filter (220). Water passing through the membrane filter (210) and the pre-filter (220) in the reverse direction can be discharged to the outside of the filter (200) through the raw water inlet (200a) via the first channel (200d).

[0113] As described above, when supplying purified water, water from the raw water path (110) can flow into the first path (200d) inside the filter (200) through the raw water inlet (200a). The water from the first path (200d) can pass through the pre-filter (220), the membrane filter (210), and the post-filter (230), and then pass through the second path (200e) to be discharged outside the filter (200) through the purified water outlet (200b), or move to the top of the membrane filter (210), pass through the third path (200f), and be discharged outside the filter (200) through the wastewater outlet (200c).

[0114] When cleaning the filter, water from the drainage path (130) can flow into the third path (200f) inside the filter (200) through the wastewater outlet (200c). The water from the third path (200f) can wash the membrane filter (210) and the pre-filter (220) by passing through the membrane filter (210) and the pre-filter (220) in the reverse direction. The water that has passed through the membrane filter (210) and the pre-filter (220) in the reverse direction can pass through the first path (200d) and be discharged to the outside of the filter (200) through the raw water inlet (200a).

[0115] Fig. 9 is a drawing showing a water purifier according to one embodiment.

[0116] Referring to FIG. 9, the water purifier (2) may include a raw water passage (410) through which water flows in from the outside, a filter (200) provided to filter the water flowing in from the raw water passage (410), and a purified water passage (420) for discharging water that has passed through the filter (200) to the outside. The water flowing in from the outside to the water purifier (2) may be referred to as raw water, and the water filtered by the filter (200) may be referred to as purified water. However, hereinafter, raw water and purified water are referred to as water without distinction.

[0117] A filter (200) may be placed on the raw water path (410). A raw water valve (10a) may be placed on the raw water path (410). The raw water valve (10a) may be placed upstream of the filter (200). As the raw water valve (10a) opens and closes, water in the raw water path (410) may or may not flow into the filter (200).

[0118] The raw water valve (10a) can be placed between the connection point (401) of the raw water flow path and the first connection flow path and the connection point (402) of the raw water flow path and the second connection flow path. The first connection flow path (440) and the second connection flow path (450) will be described later.

[0119] The water purification path (420) may be connected to the filter (200). Water flowing from the raw water path (410) into the filter (200) and filtered by the filter (200) may flow into the water purification path (420). A water discharge valve (60a) may be arranged on the water purification path (420). As the water discharge valve (60a) opens and closes, water in the water purification path (420) may or may not be discharged outside the water purifier (2).

[0120] The raw water flow path (410) can be connected to the raw water inlet (200a) of the above-described filter (200). The purified water flow path (120) can be connected to the purified water outlet (200b) of the above-described filter (200).

[0121] The filter (200) may include a membrane filter (210), a pre-filter (220) positioned upstream from the membrane filter (210), and a post-filter (230) positioned downstream from the membrane filter (210).

[0122] The pre-filter (220) may include at least one of a sediment filter, a high turbidity filter, a carbon filter, a reverse osmosis filter, a micro filtration filter, a nano filtration filter, and similar filters, but is not limited thereto. The post-filter (230) may include at least one of a sediment filter, a high turbidity filter, a carbon filter, a reverse osmosis filter, a micro filtration filter, a nano filtration filter, and similar filters, but is not limited thereto.

[0123] According to one embodiment, the filter (200) may include a wastewater path therein. The wastewater path may refer to a path for discharging water that has entered the interior of the filter (200) but has not passed through the pre-filter (220), membrane filter (210), and post-filter (230) to the outside of the filter (200). The water in the wastewater path may be discharged to the outside of the filter (200) through a wastewater outlet (200c) of the filter (200), which will be described later.

[0124] The water purifier (2) may include a drainage channel (430) connected to the wastewater channel of the filter (200). The drainage channel (430) may be provided to discharge water discharged from the filter (200) through the wastewater channel to the outside of the water purifier (2).

[0125] The water purifier (2) may include a resistance valve (70a) disposed on the drainage channel (430). The resistance valve (70a) may be configured to reduce the flow rate of the drainage channel (430). The resistance valve (70a) may be configured as a passive structure that is not controlled by the above-described control unit (300) and may be configured to allow only a portion of the water upstream of the resistance valve (70a) to pass downstream of the resistance valve (70a). Therefore, the flow rate downstream of the resistance valve (70a) may be relatively low.

[0126] The water purifier (2) may include a first drain valve (20a) disposed downstream of a resistance valve (70a) on a drainage path (430). The first drain valve (20a) may be disposed between a connection point (405) of the drainage path and the second connection path and the resistance valve (70a).

[0127] The water purifier (2) may include a first connecting passage (440) connecting the upstream side (431, 432) of the resistance valve of the raw water passage (410) and the drain passage (430). A first cleaning valve (40a) may be arranged on the first connecting passage (440).

[0128] The water purifier (2) may include a second connection path (450) that connects the raw water path (410) and the downstream side (433) of the drain valve (20a) of the drain path (430) by bypassing the first connection path (440). A second cleaning valve (50a) may be arranged on the second connection path (450).

[0129] The water purifier (2) may include a third connection path (460) connecting the water purification path (420) and the drain path (430) to a downstream side (434) of the connection point (405) of the drain path and the second connection path. A second drain valve (30a) may be arranged on the third connection path (460).

[0130] The outlet valve (60a) may be positioned downstream of the connection point (403) between the water purification flow path and the third connection flow path (460) on the water purification flow path (420). In other words, the outlet valve (60a) may be positioned downstream of the third connection flow path branch point (403) of the water purification flow path (420).

[0131] Although not illustrated in FIG. 9, the water purifier (2) may include a storage tank positioned downstream of the connection point (403) between the water purifier and the third connection channel (460). The storage tank may be provided to store drinking water for the user. In other words, although FIG. 9 illustrates a direct water purifier, it may alternatively be provided as a tank-type water purifier.

[0132] FIG. 10 is a drawing showing the flow of water in a water purifier when supplying purified water in a water purifier according to one embodiment.

[0133] Referring to Fig. 10, the flow of water in the water purifier (2) when supplying purified water is described.

[0134] Purified water supply may mean that water flowing into the filter (200) through the raw water path (410) is filtered by the filter (200) and then supplied to the user through the purified water path (420) and the outlet valve (60a). This may be referred to as purified water supply mode.

[0135] When supplying purified water, the raw water valve (10a) can be opened. As the raw water valve (10a) is opened, water in the raw water paths (411, 412) on the upstream side of the raw water valve (10a) can move to the raw water path (413) on the downstream side of the raw water valve (10a) and flow into the filter (200). The first washing valve (40a) can be closed so that water does not flow into the first connecting path (440). The second washing valve (50a) can be closed so that water does not flow into the second connecting path (450).

[0136] Water passing through the filter (200) can be supplied to the user through the water outlet valve (60a) via the purified water passage (420). The water outlet valve (60a) can be opened so that water in the purified water passage (420) can pass through the water outlet valve (60a). The second drain valve (30a) can be closed so that water does not flow into the third connection passage (460).

[0137] Water discharged through the wastewater path of the filter (200) to the drain path (430) can be discharged outside the water purifier (2). In this case, discharge outside the water purifier (2) does not mean supplying it to the user.

[0138] Water flowing into the upstream side (431) of the drainage channel (430) through the wastewater channel can be discharged outside the water purifier (2) by passing through the connection point (404) of the drainage channel and the first connection channel, the resistance valve (70a), the first drain valve (20a), and the connection point (405) of the drainage channel and the second connection channel. Water flowing into the upstream side (431) of the drainage channel (430) does not flow into the first connection channel (440) because the first washing valve (40a) is closed. The first drain valve (20a) can be opened so that water passing through the resistance valve (70a) can be discharged outside the water purifier (2) by passing through the first drain valve (20a). As described above, since the second washing valve (50a) is closed, water passing through the connection point (405) of the drain path and the second connection path does not flow into the second connection path (450). In addition, since the second drain valve (30a) is closed, water passing through the connection point (406) of the drain path and the third connection path does not flow into the third connection path (460). Therefore, water can be discharged outside the water purifier (2) through the downstream side (434) of the drain path (430).

[0139] FIG. 11 is a drawing showing the flow of water in a water purifier when discharging residual water according to one embodiment.

[0140] Referring to Fig. 11, the flow of water in the water purifier (2) when discharging residual water is described.

[0141] Residual water discharge may mean that water that has entered the filter (200) through the raw water path (410) is filtered by the filter (200) and then discharged to the outside of the water purifier (2) through the purified water path (420) and the third connection path (460). This may be referred to as a residual water discharge mode. This is to remove residual water remaining in the purified water path (420) by discharging residual water before supplying purified water.

[0142] When the residual water is discharged, the raw water valve (10a) can be opened. As the raw water valve (10a) is opened, water in the raw water path (411, 412) on the upstream side of the raw water valve (10a) can move to the raw water path (413) on the downstream side of the raw water valve (10a) and flow into the filter (200). The first washing valve (40a) can be closed so that water does not flow into the first connecting path (440). The second washing valve (50a) can be closed so that water does not flow into the second connecting path (450).

[0143] Water passing through the filter (200) can flow into the third connection channel (460) through the water purification channel (420). The water discharge valve (60a) can be closed so that the water in the water purification channel (420) is not discharged outside the water purifier (2) through the water discharge valve (60a). The second drain valve (30a) can be opened so that the water flows into the third connection channel (460). The water passing through the second drain valve (30a) can be discharged outside the water purifier (2) through the downstream side (434) of the drain channel (430). As described above, since the second washing valve (50a) is closed, the water passing through the second drain valve (30a) does not flow into the second connection channel (450). As described later, the first drain valve (20a) is opened, but water passing through the second drain valve (30a) does not flow to the upstream side (432, 431) of the drain path (430) due to the resistance valve (70a).

[0144] Water discharged through the wastewater path of the filter (200) to the drain path (430) can be discharged outside the water purifier (2). In this case, discharge outside the water purifier (2) does not mean supplying it to the user.

[0145] Water flowing into the upstream side (431) of the drainage channel (430) through the wastewater channel can be discharged outside the water purifier (2) by passing through the connection point (404) of the drainage channel and the first connection channel, the resistance valve (70a), the first drain valve (20a), and the connection point (405) of the drainage channel and the second connection channel. Water flowing into the upstream side (431) of the drainage channel (430) does not flow into the first connection channel (440) because the first washing valve (40a) is closed. The first drain valve (20a) can be opened so that water passing through the resistance valve (70a) can be discharged outside the water purifier (2) by passing through the first drain valve (20a). As described above, since the second washing valve (50a) is closed, water passing through the connection point (405) of the drain passage and the second connection passage does not flow into the second connection passage (450). As described above, although the second drain valve (30a) is open, water passing through the connection point (406) of the drain passage and the third connection passage does not flow into the third connection passage (460) due to the pressure of the water discharged through the second drain valve (30a). Therefore, it can be discharged outside the water purifier (2) through the downstream side (434) of the drain passage (430).

[0146] Fig. 12 is a drawing showing the flow of water in a water purifier when cleaning a filter according to one embodiment.

[0147] Referring to Fig. 12, the flow of water in the water purifier (2) when washing the filter is explained.

[0148] According to one embodiment, filter washing may mean washing the filter (200) by introducing water from the raw water path (410) in the reverse direction into the filter (200) through the first connection path (440) and the drain path (430), and then discharging the water to the outside of the water purifier (2) through the raw water path (110), the second connection path (450), and the drain path (430). When supplying purified water, water is supplied into the filter (200) through the raw water path (410), but when washing the filter, water may be discharged to the outside of the filter (200) through the raw water path (410). Therefore, this is called back washing. This may be referred to as a filter washing mode.

[0149] According to one embodiment, when cleaning the filter, the raw water valve (10) may be closed, and the first cleaning valve (40a) and the second cleaning valve (50a) may be opened. As the raw water valve (10) is closed and the first cleaning valve (40a) is opened, water in the upstream side (411) of the raw water path (410) may flow into the first connecting path (440). The water flowing into the first connecting path (440) may flow in the reverse direction into the filter (200) through the upstream side (431) of the drain path (430). The first drain valve (20a) may be closed so that water in the first connecting path (440) does not flow toward the resistance valve (70a) and the first drain valve (20a) of the drain path (430).

[0150] As described above, when water flows into the filter (200) through the drainage path (430), it can flow into the filter (200) through the wastewater outlet (200c). The water flowing into the filter (200) can be discharged to the outside of the filter (200) through the raw water inlet (200a) after backwashing the filter (200).

[0151] Water discharged outside the filter (200) through the raw water inlet (200a) can flow into the raw water passage (410). Since the outlet valve (60a) and the second drain valve (30a) are closed, water discharged outside the filter (200) may not flow into the purified water passage (420). Water flowing into the downstream side (413) of the raw water passage (110) can flow into the second connection passage (450) through the connection point (402) of the raw water passage and the second connection passage. This is because water does not flow to the upstream side (411, 412) of the raw water passage as the raw water valve (10) is closed. The second washing valve (50a) can be opened so that water in the second connection passage (450) can flow into the drain passage (430). The water in the second connection channel (450) can be discharged outside the water purifier (2) through the connection point (405) of the drain channel and the second connection channel, and the connection point (406) of the drain channel and the third connection channel. As described above, since the first drain valve (20a) is closed, the water in the second connection channel (450) may not flow from the connection point (405) of the drain channel and the second connection channel toward the resistance valve (70a). Since the second drain valve (30a) is closed, the water in the second connection channel (450) may not flow from the connection point (406) of the drain channel and the third connection channel toward the second drain valve (30a).

[0152] Referring to FIGS. 10 and 12, the direction of movement of water flowing through the raw water path (410) during purified water supply and the direction of movement of water flowing through the raw water path (410) during filter cleaning may be opposite to each other. More specifically, the direction of movement of water flowing through the downstream side (413) of the raw water path (410) during purified water supply may be opposite to the direction of movement of water flowing through the downstream side (413) of the raw water path (410) during filter cleaning.

[0153] Referring to FIGS. 10 and 12, the direction of movement of water flowing through the drainage channel (430) when supplying purified water and the direction of movement of water flowing through the drainage channel (430) when cleaning the filter may be opposite to each other. More specifically, the direction of movement of water flowing through the upstream side (431) of the drainage channel (130) when supplying purified water may be opposite to the direction of movement of water flowing through the upstream side (431) of the drainage channel (130) when cleaning the filter.

[0154] Fig. 13 is a drawing showing control configurations of a water purifier according to one embodiment.

[0155] The water purifier (2) may include a power supply unit (160), a user interface (170), a sensor (180), and a control unit (300). In addition, the water purifier (2) may include a raw water valve (10a), a first drain valve (20a), a second drain valve (30a), a first washing valve (40a), a second washing valve (50a), and a water outlet valve (60a).

[0156] The components of the water purifier (2) are not limited to those illustrated. Some of the illustrated components may be omitted, or other components may be added. For example, the water purifier (2) may further include a communication device for communicating with an external device.

[0157] The control unit (300) can be electrically connected to components of the water purifier (2) and can control the operation of the water purifier (2). The control unit (300) can include a memory (310) and a processor (320). Descriptions that overlap with the above will be omitted.

[0158] Fig. 14 is a table showing a control method of valves according to each mode in a water purifier according to one embodiment.

[0159] Referring to FIGS. 10 to 12 and FIG. 14, the control of valves in the purified water supply mode, the residual water discharge mode and the filter cleaning mode will be described.

[0160] Referring to FIGS. 10 and 14, when supplying purified water, the control unit (300) can control to open the raw water valve (10a), the first drain valve (20a), and the discharge valve (60a). The control unit (300) can control to close the second drain valve (30a), the first wash valve (50a), and the second wash valve (60a).

[0161] Based on the control of the above-described control unit (300), water in the raw water path (410) can pass through the filter (200) and then be discharged outside the water purifier (2) through the discharge valve (60a). The water discharged outside the water purifier (2) through the discharge valve (60a) can be supplied to the user.

[0162] Referring to FIGS. 11 and 14, when discharging residual water, the control unit (300) can control to open the raw water valve (10a), the first drain valve (20a), and the second drain valve (30a). The control unit (300) can control to close the first washing valve (40a), the second washing valve (50a), and the discharge valve (60a).

[0163] Based on the control of the above-described control unit (300), water in the raw water path (410) can be supplied to the third connection path (460) after passing through the filter (200). Water flowing into the third connection path (460) can be discharged outside the water purifier (2) through the drain path (430).

[0164] Referring to FIGS. 12 and 14, when cleaning the filter, the control unit (300) can control to open the first cleaning valve (20a) and the second cleaning valve (20b). The control unit (300) can control to close the raw water valve (10a), the first drain valve (20a), the second drain valve (30a), and the outlet valve (60a).

[0165] Based on the control of the above-described control unit (300), water in the raw water path (410) can be discharged to the outside of the water purifier (2) through the first connection path (440) and the drain path (430) after backwashing the filter (200), and then through the raw water path (410), the second connection path (450) and the drain path (430).

[0166] According to one embodiment, a water purifier includes a raw water channel provided to receive external water and including at least one valve, a filter provided to filter water introduced from the raw water channel and including a waste water channel therein, a purified water channel provided to discharge water passing through the filter to the outside and including at least one valve, a drainage channel connected to the waste water channel of the filter and provided to discharge water discharged from the filter through the waste water channel and including at least one valve, a resistance valve disposed on the drainage channel and provided to reduce a flow rate of the drainage channel, a first connection channel connecting the raw water channel and a downstream side of the resistance valve of the drainage channel and including at least one valve, a second connection channel connecting the purified water channel and an upstream side of the resistance valve of the drainage channel and including at least one valve, and a tank provided to store water passing through the filter and disposed on the second connection channel. When washing the filter, water stored in the tank is arranged to flow into the filter through the upstream side of the resistance valve of the drainage channel, and water discharged from the filter through the inside of the filter is arranged to be discharged to the outside through the raw water channel, the first connection channel, and the downstream side of the resistance valve of the drainage channel.

[0167] When washing the filter, water stored in the tank may be arranged to flow into the filter without passing through the resistance valve, and water discharged from the filter after passing through the inside of the filter may be arranged to be discharged to the outside without passing through the resistance valve.

[0168] The filter may include a raw water inlet provided to allow water from the raw water path to flow in, a purified water outlet provided to discharge water that has passed through the inside of the filter, and a waste water outlet provided to discharge water from the waste water path.

[0169] When washing the filter, water stored in the tank may be provided to flow into the filter through the wastewater outlet and discharged to the outside of the filter through the raw water inlet.

[0170] When supplying purified water, the direction of movement of water flowing upstream of the resistance valve of the raw water path and the drainage path, and when washing the filter, the direction of movement of water flowing upstream of the resistance valve of the raw water path and the drainage path may be opposite to each other.

[0171] The above water purifier may further include a raw water valve disposed upstream of a connection point between the raw water path and the first connection path on the raw water path.

[0172] The above water purifier may further include a drain valve disposed between a connection point of the drain path and the first connection path and the resistance valve on the drain path.

[0173] The above water purifier may further include a cleaning valve disposed on the first connecting passage.

[0174] The above water purifier may further include a tank valve disposed upstream of the tank on the second connection path.

[0175] The above water purifier may further include a water discharge valve disposed downstream of a connection point between the above water purification path and the second connection path on the above water purification path.

[0176] The water purifier may further include at least one processor and a processing circuit, each or collectively including a control unit configured to control opening and closing of the raw water valve, the drain valve, the washing valve, the tank valve, and the outlet valve.

[0177] When supplying purified water, the at least one processor and the processing circuit can individually or collectively control the raw water valve, the drain valve and the outlet valve to open, and control the tank valve and the cleaning valve to close.

[0178] The at least one processor and the processing circuit may be individually or collectively configured to control the water in the raw water path to pass through the filter and then be discharged to the outside through the purified water path and the discharge valve.

[0179] When supplying water to the tank, the at least one processor and the processing circuit can individually or collectively control the raw water valve, the drain valve and the tank valve to open, and control the water outlet valve and the cleaning valve to close.

[0180] The at least one processor and the processing circuit may be individually or collectively configured to control the water of the raw water path to be supplied to the tank through the purified water path and the second connection path after passing through the filter.

[0181] The above water purifier may further include a pump disposed downstream of the tank on the second connection path and configured to move water inside the tank to the filter.

[0182] When washing the filter, the at least one processor and the processing circuit can individually or collectively control the pump to operate, control the washing valve to open, and control the raw water valve, the drain valve, the tank valve, and the outlet valve to close.

[0183] The at least one processor and the processing circuit may be individually or collectively configured to control the water stored in the tank to pass through the second connection channel and the upstream side of the resistance valve of the drain channel, wash the filter, and then discharge to the outside through the raw water channel, the first connection channel, and the downstream side of the resistance valve of the drain channel.

[0184] The above water purifier may further include a check valve disposed downstream of the pump on the second connection path.

[0185] The above check valve can allow water discharged from the pump to move to the downstream side of the check valve and block water in the drainage path from flowing into the pump located on the upstream side of the check valve.

[0186] The above filter may include a membrane filter.

[0187] The above water purifier may be arranged to wash the membrane filter when washing the filter.

[0188] The above filter may further include a pre-filter provided on the upstream side of the membrane filter and a post-filter provided on the downstream side of the membrane filter.

[0189] The above water purifier may be arranged to wash the membrane filter and the pre-filter when washing the filter.

[0190] The filter may further include a filter housing configured to accommodate the pre-filter, the membrane filter, and the post-filter.

[0191] Each of the above pre-filter and the above post-filter may include at least one of a sediment filter, a high turbidity filter, a carbon filter, a reverse osmosis filter, a micro filtration filter, and a nano filtration filter.

[0192] According to one embodiment, a water purifier includes a raw water channel through which water flows in from the outside and includes at least one valve, a filter configured to filter water flowing in from the raw water channel and including a waste water channel therein, a purified water channel configured to discharge water passing through the filter to the outside and including at least one valve, a drain channel connected to the waste water channel of the filter and configured to discharge water discharged from the filter through the waste water channel and including at least one valve, a resistance valve disposed on the drain channel and configured to reduce a flow rate of the drain channel, a first connection channel connecting the raw water channel and an upstream side of the resistance valve of the drain channel and including at least one valve, and a second connection channel connecting the raw water channel and the drain channel by bypassing the first connection channel and including at least one valve, the second connection channel connecting a downstream side of a branch point of the first connection channel on the raw water channel and a downstream side of the resistance valve of the drain channel. When washing the filter, water from the raw water path is arranged to flow into the filter through the first connection path and the upstream side of the resistance valve of the drain path, and water discharged from the filter through the inside of the filter is arranged to be discharged to the outside through the raw water path, the second connection path, and the downstream side of the resistance valve of the drain path.

[0193] When washing the filter, water from the raw water path may be arranged to flow into the filter without passing through the resistance valve, and water discharged from the filter after passing through the inside of the filter may be arranged to be discharged to the outside without passing through the resistance valve.

[0194] The above water purifier may further include a raw water valve disposed between a connection point of the raw water path and the first connection path and a connection point of the raw water path and the second connection path on the raw water path.

[0195] The water purifier may further include a first drain valve disposed between a connection point of the drain path and the second connection path and the resistance valve on the drain path.

[0196] The above water purifier may further include a first washing valve disposed on the first connecting passage.

[0197] The above water purifier may further include a second washing valve disposed on the second connecting passage.

[0198] The above water purifier may further include a water discharge valve disposed on the water purification path.

[0199] The water purifier may further include a third connection channel connecting the upstream side of the outlet valve in the water purification channel and the downstream side of the branch point of the second connection channel in the drain channel.

[0200] The above water purifier may further include a second drain valve disposed on the third connecting passage.

[0201] The water purifier may further include a control unit configured to control opening and closing of the raw water valve, the first drain valve, the first wash valve, the second wash valve, the outlet valve, and the second drain valve, each or collectively including at least one processor and a processing circuit.

[0202] When washing the filter, the at least one processor and the processing circuit can individually or collectively control to open the first washing valve and the second washing valve, and to close the raw water valve, the drain valve, and the outlet valve.

[0203] The at least one processor and the processing circuit may be individually or collectively configured to control water in the raw water path to flow into the filter through the first connection path and the upstream side of the resistance valve in the drain path, and water discharged from the filter after washing the filter to be discharged to the outside through the raw water path, the second connection path, and the downstream side of the resistance valve in the drain path.

[0204] When supplying purified water, the at least one processor and the processing circuit can individually or collectively control the raw water valve, the first drain valve and the outlet valve to open, and control the second drain valve, the first wash valve and the second wash valve to close.

[0205] The at least one processor and the processing circuit may be individually or collectively configured to control the water in the raw water path to pass through the filter and then be discharged to the outside through the purified water path and the discharge valve.

[0206] When discharging residual water, the at least one processor and the processing circuit can individually or collectively control the raw water valve, the first drain valve and the second drain valve to open, and control the first wash valve, the second wash valve and the discharge valve to close.

[0207] The at least one processor and the processing circuit may be individually or collectively configured to control the water of the raw water path to pass through the filter and then be discharged to the outside through the purified water path, the third connection path, and the downstream side of the resistance valve of the drain path.

[0208] The filter may include a raw water inlet provided to allow water from the raw water path to flow in, a purified water outlet provided to discharge water that has passed through the inside of the filter, and a waste water outlet provided to discharge water from the waste water path.

[0209] When washing the above filter, water from the raw water path can flow into the filter through the waste water outlet and be discharged outside the filter through the raw water inlet.

[0210] According to the invention of the present invention, a water purifier including a filter including a wastewater path and capable of washing the filter can be provided.

[0211] According to the invention, a water purifier capable of washing a filter without disassembling the filter can be provided by controlling components.

[0212] According to the idea of ​​the present disclosure, a water purifier can be provided that can selectively wash a filter with a short replacement cycle among a plurality of filters.

[0213] According to the idea of ​​the present disclosure, a water purifier capable of washing a filter at a relatively high flow rate without passing through a resistance valve can be provided.

[0214] 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 raw water path designed to receive water from outside; A filter configured to filter water flowing in from the above raw water path and including a waste water path therein; A water purification path provided to discharge water passing through the above filter to the outside; A drainage channel connected to the wastewater channel of the filter and provided to discharge water discharged from the filter through the wastewater channel; A resistance valve arranged on the drain path to reduce the flow rate of the drain path; A first connecting passage connecting the downstream side of the resistance valve of the above raw water passage and the above drain passage; A second connecting passage connecting the upstream side of the resistance valve of the above-mentioned water passage and the above-mentioned drain passage; and A tank is provided to store water passing through the filter and is disposed on the second connecting passage; When washing the above filter, The water stored in the above tank is arranged to flow into the filter through the upstream side of the resistance valve of the above drainage path, A water purifier in which water discharged from the filter through the inside of the filter is discharged to the outside through the downstream side of the resistance valve of the raw water path, the first connecting path, and the drain path.

2. In paragraph 1, When washing the above filter, A water purifier in which water stored in the tank is arranged to flow into the filter without passing through the resistance valve, and water discharged from the filter after passing through the inside of the filter is arranged to be discharged to the outside without passing through the resistance valve.

3. In paragraph 1, The above filter is, A raw water inlet provided to allow water from the above raw water flow to flow in, A water purification outlet provided to discharge water that has passed through the inside of the above filter, and Including a wastewater outlet provided to discharge water from the above wastewater path, A water purifier provided so that when the filter is washed, water stored in the tank flows into the filter through the wastewater outlet and is discharged outside the filter through the raw water inlet.

4. In paragraph 1, A water purifier in which the direction of movement of water flowing upstream of the resistance valve of the raw water path and the drainage path when supplying purified water, and the direction of movement of water flowing upstream of the resistance valve of the raw water path and the drainage path when washing the filter are opposite to each other.

5. In paragraph 1, A raw water valve positioned upstream of the connection point between the raw water path and the first connecting path on the raw water path; A drain valve disposed between the connection point of the drain path and the first connecting path and the resistance valve on the above drain path; A washing valve disposed on the first connecting passage; A tank valve positioned upstream of the tank on the second connecting passage; On the above-mentioned water purification path, the outlet valve is positioned downstream from the connection point between the above-mentioned water purification path and the second connection path; and A water purifier further comprising a control unit, which includes at least one processor and a processing circuit, each or collectively, and is arranged to control opening and closing of the raw water valve, the drain valve, the washing valve, the tank valve, and the outlet valve.

6. In paragraph 5, In the case of supplying the integer, the at least one processor and the processing circuit, individually or collectively, Controlling to open the above raw water valve, the drain valve and the outlet valve, and controlling to close the tank valve and the washing valve, A water purifier provided to control water from the above raw water path to pass through the above filter and then be discharged to the outside through the above purified water path and the above discharge valve.

7. In paragraph 5, When supplying water to the tank, the at least one processor and the processing circuit, individually or collectively, Controlling to open the above raw water valve, the above drain valve and the above tank valve, and controlling to close the above discharge valve and the above wash valve, A water purifier provided to control water from the above raw water path to pass through the above filter and then be supplied to the above tank through the above purified water path and the above second connecting path.

8. In paragraph 5, Further comprising a pump disposed downstream of the tank on the second connecting passage and configured to move water inside the tank to the filter; When washing the filter, the at least one processor and the processing circuit, individually or collectively, Controlling the above pump to operate, controlling the above cleaning valve to open, and controlling the above raw water valve, the above drain valve, the above tank valve and the above outlet valve to close, A water purifier provided with a control mechanism so that water stored in the tank is discharged to the outside through the raw water path, the first connection path, and the downstream side of the resistance valve of the drain path after washing the filter by passing through the upstream side of the resistance valve of the second connection path and the drain path.

9. In paragraph 8, Further comprising a check valve disposed downstream of the pump on the second connecting passage; A water purifier in which the above check valve allows water discharged from the pump to move to the downstream side of the check valve and blocks water in the drainage passage from flowing into the pump located on the upstream side of the check valve.

10. In paragraph 1, The above filter comprises a membrane filter, A water purifier provided so as to wash the membrane filter when washing the filter.

11. In paragraph 10, The above filter further includes a pre-filter provided on the upstream side of the membrane filter and a post-filter provided on the downstream side of the membrane filter. A water purifier configured to wash the membrane filter and the pre-filter when washing the filter.

12. In paragraph 11, A water purifier further comprising a filter housing configured to accommodate the pre-filter, the membrane filter, and the post-filter.

13. In paragraph 11, Each of the above pre-filter and the above post-filter, A water purifier comprising at least one of a sediment filter, a high turbidity filter, a carbon filter, a reverse osmosis filter, a micro filtration filter, and a nano filtration filter.

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