Filtration apparatus for electrochemical device

Abstract

The present disclosure relates to a filtration apparatus for an electrochemical device that improves durability and stability. The filtration apparatus includes: a supply line configured to supply a target fluid to an electrochemical device; a first filter member provided in the supply line; a second filter member located on the downstream side of the first filter member; the first end of the first bypass pipeline is located on the upstream side of the first filtering part, and the second end of the first bypass pipeline is located between the first filtering part and the second filtering part; the first end of the second bypass pipeline is located on the downstream side of the second filtering part, and the second end of the second bypass pipeline is located on the upstream side of the first filtering part; and a third bypass line, a first end of the third bypass line being located between the first filter member and the second filter member, and a second end of the third bypass line being located on a downstream side of the second filter member.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0138861 filed in the Korean Intellectual Property Office on October 17, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a filter apparatus for an electrochemical device, and more particularly, to a filter apparatus for an electrochemical device capable of ensuring performance of the electrochemical device and improving durability and stability of the electrochemical device. Background Art

[0004] In response to global warming and fossil fuel depletion, the need for research and development of alternative energy sources is increasing. Hydrogen energy is gaining attention as a practical solution to environmental and energy issues.

[0005] In particular, hydrogen has attracted much attention as a future energy carrier due to its high energy density and suitability for grid-scale applications.

[0006] A water electrolysis stack, one of the electrochemical devices, refers to a device that generates hydrogen and oxygen by electrochemically decomposing water. The water electrolysis stack can be constructed by stacking dozens or hundreds of water electrolysis units (unit cells) in series.

[0007] On the other hand, when the target fluid (reactant) (e.g., water) to be supplied to an electrochemical device (e.g., a water electrolysis stack) contains ions and foreign matter (impurities), the performance, durability, and reliability of the electrochemical device are reduced. Therefore, it is necessary to remove the ions and foreign matter contained in the target fluid as much as possible. Summary of the invention

[0008] The present disclosure is directed to providing a filtering apparatus for an electrochemical device capable of ensuring the performance of the electrochemical device and improving the durability and stability of the electrochemical device.

[0009] In particular, the present disclosure is directed to unifying the replacement cycle (lifespan) of filter components and extending the replacement cycle (lifespan) of the filter components.

[0010] The present disclosure also aims to facilitate maintenance and repair and reduce maintenance and repair costs.

[0011] The present disclosure is also directed to changing the characteristics of a supply target fluid according to an operating condition of an electrochemical device and effectively coping with a load change of the electrochemical device.

[0012] The objectives to be achieved by the embodiments are not limited to the above objectives, but also include objectives or effects that can be understood through the following schemes or embodiments.

[0013] To achieve the above-mentioned purpose, an exemplary embodiment of the present disclosure provides a filtering device for an electrochemical device, the filtering device comprising: a supply line, configured to supply a target fluid to the electrochemical device; a first filter component, arranged in the supply line; a second filter component, located on the downstream side of the first filter component and arranged in the supply line; a first bypass line, one end of the first bypass line is located on the upstream side of the first filter component and connected to the supply line, and the other end of the first bypass line is located between the first filter component and the second filter component and connected to the supply line; a second bypass line, one end of the second bypass line is located on the downstream side of the second filter component and connected to the supply line, and the other end of the second bypass line is located on the upstream side of the first filter component and connected to the supply line; and a third bypass line, one end of the third bypass line is located between the first filter component and the second filter component and connected to the supply line, and the other end of the third bypass line is located on the downstream side of the second filter component and connected to the supply line.

[0014] According to an exemplary embodiment of the present disclosure, a filtering device for an electrochemical device may include: a first three-way valve, located on the upstream side of a first filter component, arranged in a supply line, and connected to one end of a first bypass line; a second three-way valve, located between the first filter component and the second filter component, arranged in the supply line, and connected to one end of a third bypass line; and a third three-way valve, located on the downstream side of the second filter component, arranged in the supply line, and connected to one end of the second bypass line.

[0015] The filter apparatus for an electrochemical device according to an exemplary embodiment of the present disclosure may include a third filter member located at a downstream side of the second filter member and disposed in the supply line.

[0016] According to an exemplary embodiment of the present disclosure, a filtering device for an electrochemical device may include: a fourth bypass line, one end of the fourth bypass line is connected to the first bypass line, the other end of the fourth bypass line is located between the second filter component and the third filter component and is connected to the supply line; and a fifth bypass line, one end of the fifth bypass line is located between the second filter component and the third filter component and is connected to the supply line, the other end of the fifth bypass line is connected to the third bypass line, wherein one end of the second bypass line is located on the downstream side of the third filter component and is connected to the supply line.

[0017] A filtering device for an electrochemical device according to an exemplary embodiment of the present disclosure may include: a fourth three-way valve, located between the second filter component and the second three-way valve, arranged in the supply line, and connected to the other end of the first bypass line; a fifth three-way valve, located between the second filter component and the third filter component, arranged in the supply line, and connected to one end of the fifth bypass line; and a sixth three-way valve, arranged in the first bypass line, and connected to one end of the fourth bypass line.

[0018] A filtering device for an electrochemical device according to an exemplary embodiment of the present disclosure may include: a first ion sensor located on an upstream side of a first filter component, disposed in a supply line, and configured to sense the ionic conductivity of a target fluid; a second ion sensor located between the first filter component and the second filter component, disposed in the supply line, and configured to sense the ionic conductivity of the target fluid; a third ion sensor located between the second filter component and the third filter component, disposed in the supply line, and configured to sense the ionic conductivity of the target fluid; and a fourth ion sensor located on a downstream side of the third filter component, disposed in the supply line, and configured to sense the ionic conductivity of the target fluid.

[0019] According to an exemplary embodiment of the present disclosure, the order in which the target fluid passes through the first filter part, the second filter part, and the third filter part may be defined based on the sensing results of the first ion sensor, the second ion sensor, the third ion sensor, and the fourth ion sensor.

[0020] According to an exemplary embodiment of the present disclosure, the target fluid can be defined as moving along any one of the following paths: a first serial path, passing through the first filter component, the second filter component and the third filter component in sequence; a second serial path, passing through the second filter component, the third filter component and the first filter component in sequence; and a third serial path, passing through the third filter component, the first filter component and the second filter component in sequence.

[0021] According to an exemplary embodiment of the present disclosure, based on the sensing results of the first ion sensor, the second ion sensor, the third ion sensor and the fourth ion sensor, the target fluid can be defined to move along a non-transmission path that does not pass through at least any one of the first filter component, the second filter component and the third filter component.

[0022] According to an exemplary embodiment of the present disclosure, a filtering device for an electrochemical device may include: a first flow meter, located on the upstream side of a first filtering component, arranged in a supply pipeline, and configured to measure the mass flow rate of a target fluid; and a second flow meter, located on the downstream side of a third filtering component, arranged in the supply pipeline, and configured to measure the mass flow rate of the target fluid.

[0023] According to an exemplary embodiment of the present disclosure, based on sensing results of the first flow meter and the second flow meter, the target fluid may be defined to move along parallel paths simultaneously passing through at least two or more of the first filter component, the second filter component, and the third filter component.

[0024] The filtering apparatus for an electrochemical device according to an exemplary embodiment of the present disclosure may include a seventh three-way valve disposed in the third bypass line and connected to the other end of the fifth bypass line.

[0025] In the filter apparatus for an electrochemical device according to an exemplary embodiment of the present disclosure, the second filter part may include a filter module that can be selectively separated from the supply line.

[0026] According to an exemplary embodiment of the present disclosure, a filtering device for an electrochemical device may include: a first check valve, which is arranged in a second bypass line and is configured to limit the backflow of the target fluid; a second check valve, which is arranged in a third bypass line and is configured to limit the backflow of the target fluid; and a third check valve, which is arranged in a fourth bypass line and is configured to limit the backflow of the target fluid.

[0027] According to the embodiments of the present disclosure described above, advantageous effects of ensuring the performance of an electrochemical device and improving durability and stability can be obtained.

[0028] In particular, according to the embodiments of the present disclosure, it is possible to obtain the advantageous effects of unifying the replacement cycle (lifespan) of the filter components and extending the replacement cycle (lifespan) of the filter components.

[0029] In addition, according to the embodiments of the present disclosure, advantageous effects of facilitating maintenance and repair and reducing maintenance and repair costs can be obtained.

[0030] In addition, according to the embodiments of the present disclosure, it is possible to obtain an advantageous effect of changing the characteristics of the supply target fluid according to the operating conditions of the electrochemical device and an advantageous effect of effectively coping with a load change of the electrochemical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a view for explaining a filtering apparatus for an electrochemical device according to an embodiment of the present disclosure.

[0032] Figure 2 is a view for explaining a first serial path of a filter apparatus for an electrochemical device according to an embodiment of the present disclosure.

[0033] Figure 3 is a view for explaining a second serial path of the filter apparatus for an electrochemical device according to an embodiment of the present disclosure.

[0034] Figure 4is a view for explaining a third serial path of the filter apparatus for an electrochemical device according to an embodiment of the present disclosure.

[0035] Figure 5 is a view for explaining parallel paths of a filtering apparatus for an electrochemical device according to an embodiment of the present disclosure.

[0036] Figure 6 , Figure 7 and Figure 8 is a view for explaining a non-transmitting path of a filter apparatus for an electrochemical device according to an embodiment of the present disclosure.

[0037] Fig. 9 and Fig.10 is a view for explaining a filter module of a filter apparatus for an electrochemical device according to an embodiment of the present disclosure.

[0038] Fig.11 2 is a view for explaining a seventh three-way valve of the filter apparatus for an electrochemical device according to an embodiment of the present disclosure.

[0039] Description of Reference Numerals

[0040] 10: Filtration equipment for electrochemical devices 20: Electrochemical devices

[0041] 30: Supply line 110: First filter component

[0042] 120: second filter component 120', 120": filter module

[0043] 130: third filter component 210: first bypass line

[0044] 220: Second bypass line 230: Third bypass line

[0045] 240: Fourth bypass line 250: Fifth bypass line

[0046] 310: First three-way valve 320: Second three-way valve

[0047] 330: Third three-way valve 340: Fourth three-way valve

[0048] 350: Fifth three-way valve 360: Sixth three-way valve

[0049] 370: Seventh three-way valve 410: First ion sensor

[0050] 420: second ion sensor 430: third ion sensor

[0051] 440: fourth ion sensor 510: first flow meter

[0052] 520: Second flow meter 610: First check valve

[0053] 620: Second check valve 630: Third check valve DETAILED DESCRIPTION

[0054] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0055] However, the technical spirit of the present disclosure is not limited to some embodiments described herein, but can be implemented in various different forms. Within the scope of the technical spirit of the present disclosure, one or more of the constituent elements in the embodiments can be selectively combined and replaced.

[0056] In addition, unless otherwise specifically and clearly defined and explained, the terms (including technical terms and scientific terms) used in the embodiments of the present disclosure can be interpreted as the meanings that are generally understood by ordinary technicians in the field to which the present disclosure belongs. The meanings of general terms such as terms defined in dictionaries can be interpreted in consideration of the contextual meanings of the relevant technology.

[0057] In addition, the terms used in the embodiments of the present disclosure are for explaining the embodiments rather than for limiting the present disclosure.

[0058] In the present specification, unless otherwise specifically stated, a singular form may also include a plural form. The expression "at least one (or one or more) of A, B, and C" may include one or more of all combinations that can be formed by combining A, B, and C.

[0059] In addition, terms such as first, second, A, B, (a), and (b) may be used to describe constituent elements of the embodiments of the present disclosure.

[0060] These terms are used only for the purpose of distinguishing one constituent element from another constituent element, and the nature, order or sequence of the constituent elements is not limited by these terms.

[0061] Further, when a constituent element is described as being “connected,” “coupled” or “attached” to another constituent element, the one constituent element may be directly connected, coupled or attached to the other constituent element, or connected, coupled or attached to the other constituent element through other constituent elements interposed between the two constituent elements.

[0062] In addition, the expression "one constituent element is disposed or arranged above (upper) or below (lower) another constituent element" includes not only the case where the two constituent elements are in direct contact with each other, but also the case where one or more other constituent elements are disposed or arranged between the two constituent elements. The expression "above (upper) or below (lower)" may indicate a downward direction as well as an upward direction based on one constituent element.

[0063] Reference Figures 1 to 11 The filter device 10 for an electrochemical device according to an embodiment of the present disclosure includes: a supply line 30 configured to supply a target fluid to an electrochemical device 20; a first filter component 110 disposed in the supply line 30; a second filter component 120 disposed in the supply line 30 and located at a downstream side of the first filter component 110; a first bypass line 210, one end of the first bypass line 210 being located at an upstream side of the first filter component 110 and connected to the supply line 30, and the other end of the first bypass line 210 being located between the first filter component 110 and the second filter component 120. a second bypass line 220, one end of which is located on the downstream side of the second filter component 120 and connected to the supply pipeline 30, and the other end of which is located on the upstream side of the first filter component 110 and connected to the supply pipeline 30; and a third bypass line 230, one end of which is located between the first filter component 110 and the second filter component 120 and connected to the supply pipeline 30, and the other end of which is located on the downstream side of the second filter component 120 and connected to the supply pipeline 30.

[0064] For reference, in an embodiment of the present disclosure, the electrochemical device 20 is defined as including both a water electrolysis stack configured to decompose water through an electrochemical reaction to produce hydrogen and oxygen and a fuel cell stack configured to produce electrical energy through a chemical reaction of a fuel (e.g., hydrogen).

[0065] Hereinafter, an example will be described in which the filter apparatus 10 for an electrochemical device according to an embodiment of the present disclosure is configured to filter out ions and foreign substances (impurities) contained in a target fluid (reactant) (eg, water) to be supplied to a water electrolysis stack.

[0066] A water electrolysis stack (electrochemical device) may be configured by stacking a plurality of unit cells in a reference stacking direction.

[0067] More specifically, the unit cell may include a reaction layer (not shown) and separators (not shown) stacked on one surface and the other surface of the reaction layer. The water electrolysis stack may be constructed by stacking a plurality of unit cells in a reference stacking direction and assembling end plates (not shown) to two opposite ends of the plurality of unit cells.

[0068] The reaction layer may have various structures capable of causing an electrochemical reaction of a target fluid (eg, water). The present disclosure is not restricted or limited by the type and structure of the reaction layer.

[0069] For example, the reaction layer may include a membrane electrode assembly (MEA) (not shown), a first porous transport layer (not shown) in close contact with one surface of the membrane electrode assembly, and a second porous transport layer (not shown) in close contact with another surface of the membrane electrode assembly.

[0070] The membrane electrode assembly may be variously changed in structure and material according to the required conditions and design specifications. The present disclosure is not restricted or limited by the structure and material of the membrane electrode assembly.

[0071] For example, the membrane electrode assembly may be constructed by attaching catalyst electrode layers (eg, anode and cathode layers) where an electrochemical reaction occurs to two opposing surfaces of an electrolyte membrane (eg, a perfluorinated sulfonic acid ionomer-based electrolyte membrane).

[0072] The first porous transport layer and the second porous transport layer may uniformly distribute the target fluid and each have a porous structure having pores of a predetermined size.

[0073] For reference, water (target fluid) supplied to the anode layer as an oxidation electrode for water electrolysis is separated into hydrogen ions (protons), electrons and oxygen. Then, the hydrogen ions move to the cathode layer as a reduction electrode through the electrolyte membrane, and the electrons move to the cathode through an external circuit. In addition, oxygen can be discharged through the anode outlet, and the hydrogen ions and electrons can be converted into hydrogen at the cathode.

[0074] The supply line 30 is configured to supply the target fluid from a target fluid supply member (not shown) to the electrochemical device 20 (eg, a water electrolysis stack).

[0075] The supply line 30 may have various structures according to required conditions and design specifications. The present disclosure is not restricted or limited by the structure and shape of the supply line 30.

[0076] For example, the supply line 30 may be defined as an approximately straight line shape. According to another embodiment of the present disclosure, the supply line may have an "L" shape, a curved shape, or other shapes.

[0077] The first filter member 110 is disposed in the supply line 30 , and is configured to filter out ions and foreign substances (impurities) contained in a target fluid (reactant) (eg, water) to be supplied to the water electrolysis stack along the supply line 30 .

[0078] Various ion filters capable of filtering out ions and foreign matter (impurities) contained in the target fluid can be used as the first filter component 110. The present disclosure is not restricted or limited by the type and characteristics of the ion filter. For example, a fluorine resin-based ion exchange membrane, a porous ceramic partition, an ion exchange resin, a silica gel, etc. can be used as the first filter component 110.

[0079] The second filter component 120 is provided in the supply line 30 and is configured to filter out ions and foreign matter (impurities) contained in the target fluid (reactant) (e.g., water) to be supplied to the water electrolysis stack along the supply line 30. The second filter component 120 is provided in the supply line 30 and is located on the downstream side of the first filter component 110 (based on Figure 1 on the upper side of the first filter element).

[0080] Various ion filters capable of filtering out ions and foreign matter (impurities) contained in the target fluid can be used as the second filter component 120. The present disclosure is not restricted or limited by the type and characteristics of the ion filter. For example, fluororesin-based ion exchange membranes, porous ceramic separators, ion exchange resins, silica gel, etc. can be used as the second filter component 120.

[0081] According to an exemplary embodiment of the present disclosure, the filter apparatus 10 for an electrochemical device may include a third filter component 130 disposed in the supply line 30 and located at a downstream side of the second filter component 120 .

[0082] The third filter component 130 is provided in the supply line 30 and is configured to filter out ions and foreign matter (impurities) contained in the target fluid (reactant) (e.g., water) to be supplied to the water electrolysis stack along the supply line 30. The third filter component 130 is provided in the supply line 30 and is located on the downstream side of the second filter component 120 (based on Figure 1 on the upper side of the second filter element).

[0083] Various ion filters capable of filtering out ions and foreign matter (impurities) contained in the target fluid can be used as the third filter component 130. The present disclosure is not restricted or limited by the type and characteristics of the ion filter. For example, fluororesin-based ion exchange membranes, porous ceramic separators, ion exchange resins, silica gel, etc. can be used as the third filter component 130.

[0084] For reference, in the embodiment of the present disclosure shown and described above, an example in which the filter device 10 for an electrochemical device includes three filter components (a first filter component, a second filter component, and a third filter component) has been described. However, according to another embodiment of the present disclosure, the filter device for an electrochemical device may include four or more filter components.

[0085] The first bypass line 210 is configured to allow a portion (or all) of the target fluid supplied to the supply line 30 to selectively flow to the second filter component 120 (or the third filter component) without passing through the first filter component 110 .

[0086] More specifically, one end of the first bypass line 210 is located at the upstream side of the first filter component 110 (based on Figure 1 The first bypass line 210 is located at a lower side of the first filter component 110 and connected to the supply line 30, and the other end of the first bypass line 210 is located between the first filter component 110 and the second filter component 120 (for example, between the second filter component and the second three-way valve) and connected to the supply line 30.

[0087] The first bypass line 210 may have various structures according to required conditions and design specifications. The present disclosure is not restricted or limited by the structure and shape of the first bypass line 210. For example, the first bypass line 210 may have an approximately "U" shape.

[0088] The second bypass line 220 is configured to allow the target fluid having passed through the second filter member 120 to selectively flow to the upstream side of the first filter member 110 .

[0089] More specifically, one end of the second bypass line 220 is located on the downstream side of the second filter component 120 (e.g., the downstream side of the third filter component) and is connected to the supply line 30, and the other end of the second bypass line 220 is located on the upstream side of the first filter component 110 (e.g., between the first filter component and the first three-way valve) and is connected to the supply line 30.

[0090] The second bypass line 220 may have various structures according to required conditions and design specifications. The present disclosure is not restricted or limited by the structure and shape of the second bypass line 220. For example, the second bypass line 220 may have an approximately "U" shape.

[0091] The third bypass line 230 is configured to allow the target fluid having passed through the first filter component 110 to selectively flow to the downstream side of the third filter component 130 without passing through the second filter component 120 and the third filter component 130 .

[0092] More specifically, one end of the third bypass line 230 is located between the first filter component 110 and the second filter component 120 (for example, between the first filter component and the fourth three-way valve) and is connected to the supply line 30, and the other end of the third bypass line 230 is located on the downstream side of the second filter component 120 and is connected to the supply line 30.

[0093] The third bypass line 230 may have various structures according to required conditions and design specifications. The present disclosure is not restricted or limited by the structure and shape of the third bypass line 230. For example, the third bypass line 230 may have an approximately "U" shape.

[0094] According to an exemplary embodiment of the present disclosure, a filtering device 10 for an electrochemical device includes: a fourth bypass line 240, one end of which is connected to the first bypass line 210, and the other end of the fourth bypass line 240 is located between the second filter component 120 and the third filter component 130 and connected to the supply line 30; and a fifth bypass line 250, one end of the fifth bypass line 250 is located between the second filter component 120 and the third filter component 130 and connected to the supply line 30, and the other end of the fifth bypass line 250 is connected to the third bypass line 230.

[0095] The fourth bypass line 240 is configured to allow the target fluid flowing along the first bypass line 210 to selectively flow to the third filter member 130 without passing through the second filter member 120 .

[0096] More specifically, one end of the fourth bypass line 240 is connected to the first bypass line 210 (e.g., located between the first three-way valve and the fourth three-way valve and connected to the first bypass line 210), and the other end of the fourth bypass line 240 is located between the second filter component 120 and the third filter component 130 (e.g., between the third filter component and the fifth three-way valve) and connected to the supply line 30.

[0097] The fourth bypass line 240 may have various structures according to required conditions and design specifications. The present disclosure is not restricted or limited by the structure and shape of the fourth bypass line 240. For example, the fourth bypass line 240 may have an approximately "L" shape.

[0098] The fifth bypass line 250 is configured to allow the target fluid having passed through the second filter component 120 to selectively flow to the downstream side of the third filter component 130 without passing through the third filter component 130 .

[0099] More specifically, one end of the fifth bypass line 250 is located between the second filter component 120 and the third filter component 130 (e.g., between the other end of the fourth bypass line and the second filter component) and connected to the supply line 30, and the other end of the fifth bypass line 250 is connected to the third bypass line 230.

[0100] The fifth bypass line 250 may have various structures according to required conditions and design specifications. The present disclosure is not restricted or limited by the structure and shape of the fifth bypass line 250. For example, the fifth bypass line 250 may have an approximately straight line shape.

[0101] The process of switching the path of the target fluid from the supply line 30 to the first to fifth bypass lines 210, 220, 230, 240 and 250 may be implemented in various ways according to required conditions and design specifications. The present disclosure is not restricted or limited by the structure and method for switching the path of the target fluid.

[0102] According to an exemplary embodiment of the present disclosure, the filter device 10 for an electrochemical device may include: a first three-way valve 310, located on the upstream side of the first filter component 110, disposed in the supply line 30, and connected to one end of the first bypass line 210; a second three-way valve 320, located between the first filter component 110 and the second filter component 120, disposed in the supply line 30, and connected to one end of the third bypass line 230; a third three-way valve 330, located on the downstream side of the second filter component 120, disposed in the supply line 30 , and connected to one end of the second bypass line 220; a fourth three-way valve 340, located between the second filter component 120 and the second three-way valve 320, provided in the supply line 30, and connected to the other end of the first bypass line 210; a fifth three-way valve 350, located between the second filter component 120 and the third filter component 130, provided in the supply line 30, and connected to one end of the fifth bypass line 250; and a sixth three-way valve 360, provided in the first bypass line 210, and connected to one end of the fourth bypass line 240. The moving path of the target fluid can be selectively switched by the first to sixth three-way valves 310, 320, 330, 340, 350, and 360.

[0103] The first three-way valve 310 is located at the upstream side of the first filter member 110 , is provided in the supply line 30 , and is connected to one end of the first bypass line 210 .

[0104] Various three-way valves capable of allowing a portion (or all) of the target fluid supplied to the supply line 30 to selectively flow to the second filter element 120 (or the third filter element) may be used as the first three-way valve 310. The present disclosure is not restricted or limited by the type and structure of the first three-way valve 310.

[0105] For example, the first three-way valve 310 may include a first port (not shown) into which the target fluid supplied to the supply line 30 is introduced, a second port configured to guide the target fluid having passed through the first port to the second filter member 120, and a third port (not shown) connected to one end of the first bypass line 210 so that the target fluid having passed through the first port is supplied to the first bypass line 210. The moving path of the target fluid may be selectively switched by opening or closing the first port to the third port.

[0106] In this case, the operation of opening or closing the first to third ports is defined to include the operation of fully closing or opening the first to third ports and the operation of adjusting the opening degree (valve opening angle) (for example, adjusting the degree of port opening).

[0107] The second three-way valve 320 is located between the first filter member 110 and the second filter member 120 , is provided in the supply line 30 , and is connected to one end of the third bypass line 230 .

[0108] Various three-way valves capable of allowing the target fluid having passed through the first filter component 110 to selectively flow to the downstream side of the third filter component 130 may be used as the second three-way valve 320. The present disclosure is not restricted or limited by the type and structure of the second three-way valve 320. For example, the second three-way valve 320 may have a structure that is the same as or similar to that of the first three-way valve 310 described above.

[0109] The third three-way valve 330 may be located at a downstream side of the second filter member 120 , provided in the supply line 30 , and connected to one end of the second bypass line 220 .

[0110] Various three-way valves capable of allowing the target fluid having passed through the second filter component 120 (third filter component) to selectively flow to the upstream side of the first filter component 110 may be used as the third three-way valve 330. The present disclosure is not restricted or limited by the type and structure of the third three-way valve 330. For example, the third three-way valve 330 may have a structure that is the same as or similar to that of the first three-way valve 310 described above.

[0111] The fourth three-way valve 340 is located between the second filter member 120 and the second three-way valve 320 , is provided in the supply line 30 , and is connected to the other end of the first bypass line 210 .

[0112] Various three-way valves capable of allowing the target fluid flowing along the first bypass line 210 to selectively flow to the third filter component 130 may be used as the fourth three-way valve 340. The present disclosure is not restricted or limited by the type and structure of the fourth three-way valve 340. For example, the fourth three-way valve 340 may have a structure that is the same as or similar to that of the first three-way valve 310 described above.

[0113] The fifth three-way valve 350 is located between the second filter member 120 and the third filter member 130 , is provided in the supply line 30 , and is connected to one end of the fifth bypass line 250 .

[0114] Various three-way valves capable of allowing the target fluid having passed through the second filter component 120 to selectively flow to the downstream side of the third filter component 130 may be used as the fifth three-way valve 350. The present disclosure is not restricted or limited by the type and structure of the fifth three-way valve 350. For example, the fifth three-way valve 350 may have a structure that is the same as or similar to that of the first three-way valve 310 described above.

[0115] The sixth three-way valve 360 ​​is disposed in the first bypass line 210 and connected to one end of the fourth bypass line 240 .

[0116] Various three-way valves capable of allowing the target fluid flowing along the first bypass line 210 to selectively flow to the second filter component 120 or the third filter component 130 may be used as the sixth three-way valve 360. The present disclosure is not restricted or limited by the type and structure of the sixth three-way valve 360. For example, the sixth three-way valve 360 ​​may have a structure that is the same as or similar to that of the first three-way valve 310 described above.

[0117] The moving path of the target fluid may be variously changed according to the required conditions and the remaining life of the filter component, etc. The present disclosure is not restricted or limited by the moving path of the target fluid.

[0118] According to an exemplary embodiment of the present disclosure, a filtering device 10 for an electrochemical device may include: a first ion sensor 410, located on the upstream side of a first filter component 110, disposed in a supply line 30, and configured to sense the ionic conductivity of a target fluid; a second ion sensor 420, located between the first filter component 110 and the second filter component 120, disposed in the supply line 30, and configured to sense the ionic conductivity of the target fluid; a third ion sensor 430, located between the second filter component 120 and the third filter component 130, disposed in the supply line 30, and configured to sense the ionic conductivity of the target fluid; and a fourth ion sensor 440, located on the downstream side of the third filter component 130, disposed in the supply line 30, and configured to sense the ionic conductivity of the target fluid.

[0119] Various ion sensors capable of sensing ionic conductivity of the target fluid may be used as the first to fourth ion sensors 410, 420, 430, and 440. The present disclosure is not restricted or limited by the types and structures of the first to fourth ion sensors 410, 420, 430, and 440.

[0120] The movement path of the target fluid may be defined based on the sensing results of the first ion sensor 410 , the second ion sensor 420 , the third ion sensor 430 , and the fourth ion sensor 440 .

[0121] According to an exemplary embodiment of the present disclosure, the order in which the target fluid passes through the first, second, and third filter components 110 , 120 , and 130 may be defined based on sensing results of the first, second, third, and fourth ion sensors 410 , 420 , 430 , and 440 .

[0122] According to an exemplary embodiment of the present disclosure, based on the sensing results of the first ion sensor 410, the second ion sensor 420, the third ion sensor 430 and the fourth ion sensor 440, the target fluid can be defined as moving along any one of the following paths: a first serial path, passing through the first filter component 110, the second filter component 120 and the third filter component 130 in sequence (first filter component→second filter component→third filter component); a second serial path, passing through the second filter component 120, the third filter component 130 and the first filter component 110 in sequence (second filter component→third filter component→first filter component); and a third serial path, passing through the third filter component 130, the first filter component 110 and the second filter component 120 in sequence (third filter component→first filter component→second filter component).

[0123] Reference Figure 2 , the target fluid can be substantially defined to move along a first serial path that sequentially passes through the first filter component 110 , the second filter component 120 , and the third filter component 130 (first filter component→second filter component→third filter component).

[0124] When the target fluid moves along the first serial path, the first to sixth three-way valves 310 , 320 , 330 , 340 , 350 and 360 are controlled so that the target fluid can be prevented from flowing from the supply line 30 to the first to fifth bypass lines 210 , 220 , 230 , 240 and 250 .

[0125] On the other hand, when the target fluid moves along the first serial path, the first filter component 110 disposed on the most upstream side among the first to third filter components 110, 120 and 130 filters the most polluted water, and the first filter component 110 is used more frequently than the second filter component 120 and the third filter component 130 disposed on the downstream side, so that the life of the first filter component 110 may be shortened faster.

[0126] When the difference between the ionic conductivity of the target fluid sensed by the first ion sensor 410 and the ionic conductivity of the target fluid sensed by the second ion sensor 420 (the difference between the ionic conductivity of the target fluid sensed on the upstream side of the first filter component and the ionic conductivity of the target fluid sensed on the downstream side of the first filter component) is within a preset reference range, it can be determined that the end of the life of the first filter component 110 has been reached.

[0127] When the remaining life of the first filter component 110 is less than the preset reference life, Figure 3 The first to sixth three-way valves 310, 320, 330, 340, 350 and 360 are controlled so that the target fluid can move along a second serial path, which passes through the second filter component 120, the third filter component 130 and the first filter component 110 in sequence (second filter component→third filter component→first filter component).

[0128] More specifically, the second serial path may be defined as a path sequentially passing through the first bypass line 210 →the second filter component 120 →the third filter component 130 →the second bypass line 220 →the first filter component 110 →the third bypass line 230 .

[0129] Through the above method, when the difference between the ionic conductivity of the target fluid sensed by the first ion sensor 410 and the ionic conductivity of the target fluid sensed by the third ion sensor 430 (the difference between the ionic conductivity of the target fluid sensed on the upstream side of the second filter component and the ionic conductivity of the target fluid sensed on the downstream side of the second filter component) is within a preset reference range, it can be determined that the end of the life of the second filter component 120 has been reached.

[0130] When the remaining life of the second filter component 120 is less than the preset reference life, Figure 4 The first to sixth three-way valves 310, 320, 330, 340, 350 and 360 are controlled so that the target fluid can move along a third serial path, which passes through the third filter component 130, the first filter component 110 and the second filter component 120 in sequence (third filter component→first filter component→second filter component).

[0131] More specifically, the third serial path may be defined as a path sequentially passing through the first bypass line 210 →the fourth bypass line 240 →the third filter element 130 →the second bypass line 220 →the first filter element 110 →the second filter element 120 →the fifth bypass line 250 →the third bypass line 230 .

[0132] As described above, in the embodiment of the present disclosure, the target fluid moves along the first serial path, the second serial path and the third serial path in sequence. Therefore, the replacement cycle (lifespan) of the filter component can be unified and the replacement cycle (lifespan) of the filter component can be extended.

[0133] For example, in an embodiment of the present disclosure, when the target fluid moves along the first serial path for a predetermined time or longer, the ion filter (e.g., the first filter component) that is disposed on the most upstream side and reaches the end of its life first is disposed on the most downstream side of the moving path of the target fluid (e.g., disposed on the most downstream side among the first to third filter components). Therefore, the advantageous effect of unifying the replacement cycle (life) of the filter components and extending the replacement cycle (life) of the filter components can be obtained.

[0134] In addition, according to the embodiment of the present disclosure, the first to third filter components 110, 120 and 130 can be replaced at the same replacement time point. Therefore, it is possible to obtain the advantageous effects of minimizing the supply stop of the target fluid and the operation stop of the electrochemical device 20 that may be caused by frequent replacement of the filter components and reducing the cost and time required for replacing the filter components.

[0135] In the embodiment of the present disclosure shown and described above, an example of replacing the first to third filter components 110, 120 and 130 at the same replacement time point has been described. However, according to another embodiment of the present disclosure, in the case where the target fluid (e.g., ultrapure water) requires reliability (low ion conductivity characteristics) due to the operating characteristics of the electrochemical device 20, the ion filter (e.g., the first filter component) that is set on the most upstream side and first reaches the end of its life can be replaced first, and then a new filter can be set on the most downstream side of the moving path of the target fluid, so that the target fluid can finally pass through the new filter with the best filtering performance. Therefore, the ion conductivity of the target fluid to be supplied to the electrochemical device 20 can be kept at a minimum.

[0136] In the embodiments of the present disclosure shown and described above, an example in which the target fluid moves along a serial path (e.g., a first serial path, a second serial path, or a third serial path) has been described. However, according to another embodiment of the present disclosure, the target fluid can move along a parallel path passing through multiple filter components at the same time.

[0137] According to an exemplary embodiment of the present disclosure, a filtering device 10 for an electrochemical device may include: a first flow meter 510, located on the upstream side of a first filtering component 110, disposed in a supply pipeline 30, and configured to measure a mass flow rate of a target fluid; and a second flow meter 520, located on the downstream side of a third filtering component 130, disposed in a supply pipeline 30, and configured to measure a mass flow rate of a target fluid.

[0138] According to an exemplary embodiment of the present disclosure, based on the sensing results of the first flow meter 510 and the second flow meter 520, the target fluid can be defined to move along a parallel path that simultaneously passes through at least two or more of the first filter component 110, the second filter component 120 and the third filter component 130.

[0139] This is to solve a problem caused when the target fluid is supplied at a high flow rate in a case where it is necessary to supply the target fluid to the electrochemical device 20 at a high flow rate.

[0140] For example, the target fluid is used as a reactant in a water electrolysis stack (electrochemical device). In the case where the operation load of the water electrolysis stack increases, it is necessary to supply the target fluid to the water electrolysis stack at a high flow rate.

[0141] In addition, in the electrochemical system, the target fluid is also used to cool the electrochemical device 20 (e.g., a water electrolysis stack). Even when the heat generated by the water electrolysis stack (or fuel cell stack) increases or the ambient temperature increases so that the electrochemical device 20 needs to be further cooled, it is necessary to supply the target fluid to the water electrolysis stack (or fuel cell stack) at a high flow rate.

[0142] In the above case, when the target fluid moves along the serial path (e.g., the first serial path, the second serial path, or the third serial path), the target fluid is supplied at a flow rate higher than the design capacity of the filter component. Therefore, the differential pressure may increase, which may cause leakage of the filter component and the pipeline or damage the filter component. In addition, when the supply flow rate of the target fluid is insufficient due to leakage of the target fluid, the operation of the electrochemical device 20 stops or inevitably operates under harsh operating conditions.

[0143] However, according to an embodiment of the present disclosure, in the case where the target fluid needs to be supplied at a high flow rate, the target fluid moves along parallel paths passing through a plurality of filter components at the same time, thereby solving the above-mentioned problem.

[0144] That is to say, referring to Figure 5 When the flow rate of the target fluid measured by each of the first flow meter 510 and the second flow meter 520 is higher than a preset reference flow rate, the first to sixth three-way valves 310, 320, 330, 340, 350 and 360 are controlled so that the target fluid can be limited to move along a parallel path passing through the first filter component 110, the second filter component 120 and the third filter component 130 at the same time.

[0145] More specifically, a portion of the target fluid supplied to the supply line 30 can be supplied to the electrochemical device 20 along a path passing through the first filter component 110 → the third bypass line 230 in sequence, another portion of the target fluid supplied to the supply line 30 can be supplied to the electrochemical device 20 along a path passing through the first bypass line 210 → the second filter component 120 → the fifth bypass line 250 → the third bypass line 230 in sequence, and yet another portion of the target fluid supplied to the supply line 30 can be supplied to the electrochemical device 20 along a path passing through the first bypass line 210 → the fourth bypass line 240 → the third filter component 130 in sequence.

[0146] As described above, according to the embodiments of the present disclosure, the target fluid can move along parallel paths passing through a plurality of filter components at the same time, thereby stably supplying the target fluid at a high flow rate and effectively coping with risks such as an increase in operating load.

[0147] In addition, according to an embodiment of the present disclosure, whether the filter component is leaking can be determined based on the flow rate of the target fluid measured by the first flow meter 510 and the second flow meter 520 when the target fluid moves along a serial path (e.g., a first serial path, a second serial path, or a third serial path). For example, when the flow rate (outlet flow rate) of the target fluid measured by the second flow meter 520 is lower than the flow rate (inlet flow rate) of the target fluid measured by the first flow meter 510, it can be determined that the filter component is leaking.

[0148] In addition, when it is determined that leakage occurs, the moving path of the target fluid is switched from the serial path to the parallel path (the target fluid passes through the parallel paths of multiple filter components at the same time). Therefore, the advantageous effects of minimizing the differential pressure applied to the filter component and minimizing the occurrence of leakage can be obtained.

[0149] In the embodiments of the present disclosure shown and described above, an example has been described in which the target fluid passes through all filter components along a serial path or a parallel path. However, according to another embodiment of the present disclosure, the target fluid may be configured to pass through only some of the plurality of filter components.

[0150] Reference Figures 6 to 8 According to an exemplary embodiment of the present disclosure, based on the sensing results of the first ion sensor 410, the second ion sensor 420, the third ion sensor 430 and the fourth ion sensor 440, the target fluid can be defined as moving along a non-transmission path that does not pass through at least any one of the first filter component 110, the second filter component 120 and the third filter component 130.

[0151] According to the embodiments of the present disclosure described above, the target fluid moves along the non-transmission path that does not pass through at least any one of the first filter component 110, the second filter component 120, and the third filter component 130. Therefore, even when a specific filter component has a problem, the process of replacing the specific filter component can be performed without cutting off the supply of the target fluid to the electrochemical device 20.

[0152] For example, if a filter component (e.g., any one of the first to third filter components 110, 120, and 130) has a problem, such as leakage, end of life, and defect, the defective filter component needs to be replaced. In an embodiment of the present disclosure, the target fluid moves along a non-transmission path that does not pass through the defective filter component, so the process of replacing the defective filter component can be performed without cutting off the supply of the target fluid to the electrochemical device 20.

[0153] For example, refer to Figure 6 , it can be determined whether the first filter component 110 is defective (for example, whether leakage occurs or the end of life is reached) based on the ionic conductivity of the target fluid sensed by the first ion sensor 410 and the ionic conductivity of the target fluid sensed by the second ion sensor 420 (the ionic conductivity of the target fluid sensed on the upstream side of the first filter component and the ionic conductivity of the target fluid sensed on the downstream side of the first filter component). When it is determined that the first filter component 110 is defective, the first to sixth three-way valves 310, 320, 330, 340, 350 and 360 can be controlled so that the first filter component 110 can be replaced with a new filter component when the target fluid moves along the non-transmission path that does not pass through the first filter component 110.

[0154] More specifically, the non-transmission path may be defined as a path sequentially passing through the first bypass line 210→the second filter component 120→the third filter component 130, and the target fluid may move along the non-transmission path that does not pass through the first filter component 110. Thereafter, the first to sixth three-way valves 310, 320, 330, 340, 350, and 360 may be controlled so that after the first filter component 110 is replaced, the target fluid moves along the path passing through the first filter component 110 again.

[0155] By the above method, when it is determined that the second filter component 120 is defective, such as Figure 7 As shown, the first to sixth three-way valves 310, 320, 330, 340, 350 and 360 can be controlled so that the second filter component 120 can be replaced with a new filter component when the target fluid moves along the non-transmission path that does not pass through the second filter component 120. Figure 8As shown, when the third filter component 130 is determined to be defective, the first to sixth three-way valves 310, 320, 330, 340, 350 and 360 can be controlled so that the third filter component 130 can be replaced with a new filter component when the target fluid moves along a non-transmission path that does not pass through the third filter component 130.

[0156] As described above, according to an embodiment of the present disclosure, the target fluid selectively moves along a non-transmission path. Therefore, the process of replacing a specific filter component (a defective filter component) can be performed without cutting off the supply of the target fluid to the electrochemical device 20 (or without stopping the operation of the electrochemical device). In addition, the embodiment of the present disclosure can prevent shutdowns caused by the supply of the target fluid, thereby obtaining the advantageous effects of improving durability and stability.

[0157] On the other hand, refer to Fig. 9 and Fig.10 According to an exemplary embodiment of the present disclosure, the second filter component 120 may include a filter module 120 ′ or 120 ″ that can be selectively separated from the supply line 30 .

[0158] That is, according to an exemplary embodiment of the present disclosure, the second filter component 120 disposed between the filter component (e.g., the first filter component) disposed on the most upstream side of the moving path of the target fluid and the filter component (e.g., the third filter component) disposed on the most downstream side may be configured as a selectively detachable filter module 120' or 120".

[0159] In an embodiment of the present disclosure, the filter module 120' or 120" may be defined as including all of a filter member (not shown) configured to filter out ions and foreign matter (impurities) contained in the target fluid, a pipe (pipeline) (not shown) connected to the filter member, and a valve (not shown) disposed in the pipe.

[0160] The pipes and valves connected to the filter member may be variously changed in structure and number according to the required conditions and design specifications. The present disclosure is not restricted or limited by the structure of the pipes and valves connected to the filter member and the number of the pipes and valves.

[0161] For example, refer to Fig.10 The second filter component 120 may include a first filter module 120' detachably connected to the supply line 30 and a second filter module 120" detachably connected to the supply line 30 and the first filter module 120'. According to another embodiment of the present disclosure, the second filter component may include a single filter module or include three or more filter modules.

[0162] As described above, in an embodiment of the present disclosure, filter modules 120' and 120" modularized into preset sizes and structures are used to constitute the second filter component 120. Therefore, the advantageous effects of simplifying the structure and installation process, reducing costs and facilitating maintenance can be obtained. In addition, according to an embodiment of the present disclosure, without changing the overall structure of the filter device 10 for an electrochemical device, the processing capacity of the filter device 10 for an electrochemical device can be increased or decreased by selectively increasing or decreasing the number of filter modules 120' and 120".

[0163] Reference Fig.11 According to an exemplary embodiment of the present disclosure, the filtering apparatus 10 for an electrochemical device may include: a seventh three-way valve 370 disposed in the third bypass line 230 and connected to the other end of the fifth bypass line 250 .

[0164] Various three-way valves capable of allowing the target fluid having passed through the first filter component 110 to flow to the third filter component 130 along the third bypass line 230 may be used as the seventh three-way valve 370. The present disclosure is not restricted or limited by the type and structure of the seventh three-way valve 370. For example, the seventh three-way valve 370 may have a structure that is the same as or similar to that of the first three-way valve 310 described above.

[0165] Since the seventh three-way valve 370 is provided in the embodiment of the present disclosure as described above, the target fluid can be supplied to the electrochemical device 20 along a non-transmission path (a non-transmission path that does not pass through the second filter component) that passes through the first filter component 110 → the third bypass line 230 → the fifth bypass line 250 → the third filter component 130 in sequence.

[0166] According to an exemplary embodiment of the present disclosure, a filtering device 10 for an electrochemical device may include: a first check valve 610, which is arranged in a second bypass line 220 and is configured to limit the backflow of a target fluid; a second check valve 620, which is arranged in a third bypass line 230 and is configured to limit the backflow of a target fluid; and a third check valve 630, which is arranged in a fourth bypass line 240 and is configured to limit the backflow of a target fluid.

[0167] Various check valves capable of restricting the backflow of the target fluid moving along the second bypass line 220 may be used as the first check valve 610. The present disclosure is not restricted or limited by the type and structure of the first check valve 610.

[0168] Various check valves capable of restricting the backflow of the target fluid moving along the third bypass line 230 may be used as the second check valve 620. The present disclosure is not restricted or limited by the type and structure of the second check valve 620.

[0169] Various check valves capable of restricting the backflow of the target fluid moving along the fourth bypass line 240 may be used as the third check valve 630. The present disclosure is not restricted or limited by the type and structure of the third check valve 630.

[0170] Although the embodiments have been described above, the embodiments are illustrative only and are not intended to limit the present disclosure. It will be appreciated by those skilled in the art that various modifications and applications not described above may be made to the present embodiment without departing from the essential features of the present embodiment. For example, each constituent element specifically described in the embodiment may be modified and executed. Further, it should be understood that the differences associated with the modifications and applications are included within the scope of the present disclosure as defined by the appended claims.

Claims

1. A filtering device for an electrochemical device, comprising: a supply line for supplying a target fluid to the electrochemical device; a first filter component located in the supply line; a second filter component located downstream of the first filter component and in the supply line; a first bypass line, a first end of the first bypass line being located at an upstream side of the first filter component and connected to the supply line, and a second end of the first bypass line being located between the first filter component and the second filter component and connected to the supply line; a second bypass line, a first end of the second bypass line being located on a downstream side of the second filter component and connected to the supply line, and a second end of the second bypass line being located on an upstream side of the first filter component and connected to the supply line; as well as A third bypass line has a first end located between the first filter component and the second filter component and connected to the supply line, and a second end located on a downstream side of the second filter component and connected to the supply line.

2. The filtering device according to claim 1, comprising: a first three-way valve, located on an upstream side of the first filter component, disposed in the supply line and connected to a first end of the first bypass line; a second three-way valve located between the first filter component and the second filter component, located in the supply line, and connected to a first end of the third bypass line; as well as A third three-way valve, located on a downstream side of the second filter member, is located in the supply line and is connected to a first end of the second bypass line.

3. The filtering device according to claim 2, comprising: The third filter component is located at a downstream side of the second filter component and in the supply line.

4. The filtering device according to claim 3, comprising: a fourth bypass line, a first end of the fourth bypass line being connected to the first bypass line, a second end of the fourth bypass line being located between the second filter component and the third filter component and connected to the supply line; as well as a fifth bypass line, a first end of the fifth bypass line being located between the second filter component and the third filter component and connected to the supply line, a second end of the fifth bypass line being connected to the third bypass line, The first end of the second bypass line is located at the downstream side of the third filter component and is connected to the supply line.

5. The filtering device according to claim 4, comprising: a fourth three-way valve, located between the second filter component and the second three-way valve, located in the supply line, and connected to the other end of the first bypass line; a fifth three-way valve, located between the second filter component and the third filter component, located in the supply line, and connected to a first end of the fifth bypass line; as well as A sixth three-way valve is located in the first bypass line and connected to a first end of the fourth bypass line.

6. The filtering device according to claim 5, comprising: a first ion sensor located upstream of the first filter component, located in the supply line, and sensing ionic conductivity of the target fluid; a second ion sensor, located between the first filter component and the second filter component, in the supply line, and sensing ionic conductivity of the target fluid; a third ion sensor, located between the second filter component and the third filter component, in the supply line, and sensing ionic conductivity of the target fluid; as well as A fourth ion sensor, located on a downstream side of the third filter member, is located in the supply line and senses ionic conductivity of the target fluid.

7. The filtering device according to claim 6, wherein: The order in which the target fluid passes through the first filter component, the second filter component, and the third filter component is determined based on the sensing results of the first ion sensor, the second ion sensor, the third ion sensor, and the fourth ion sensor.

8. The filtering device according to claim 7, wherein: The target fluid moves along any one of the following paths: a first serial path, passing through the first filter component, the second filter component and the third filter component in sequence; a second serial path, passing through the second filter component, the third filter component and the first filter component in sequence; as well as The third serial path passes through the third filter component, the first filter component and the second filter component in sequence.

9. The filtering device according to claim 6, wherein: Based on the sensing results of the first, second, third, and fourth ion sensors, the target fluid moves along a non-transmitting path that does not pass through at least any one of the first, second, and third filter components.

10. The filtering device according to claim 5, comprising: a first flow meter located upstream of the first filter component, located in the supply line, and measuring a mass flow rate of the target fluid; as well as A second flow meter, located on a downstream side of the third filter element, is located in the supply line and measures a mass flow rate of the target fluid.

11. The filtering device according to claim 10, wherein: Based on the sensing results of the first flow meter and the second flow meter, the target fluid moves along a parallel path that simultaneously passes through at least two or more of the first filter component, the second filter component, and the third filter component.

12. The filtering device according to claim 5, comprising: A seventh three-way valve is located in the third bypass line and connected to the second end of the fifth bypass line.

13. The filtering device according to claim 5, wherein: The second filter component includes a filter module that is separable from the supply line.

14. The filtering device according to claim 5, comprising: a first check valve located in the second bypass line and restricting a backflow of the target fluid; a second check valve located in the third bypass line and restricting a backflow of the target fluid; as well as A third check valve is located in the fourth bypass line and restricts a backflow of the target fluid.

Images