Membrane humidifier, in which baffle is provided, for fuel cell

Abstract

A membrane humidifier, in which a baffle is provided, for a fuel cell comprises: a mid-case provided with a fluid moving hole through which a fluid passes; a fluid moving part disposed in the fluid moving hole of the mid-case; and a cartridge disposed in the mid-case and provided with a humidification membrane, wherein the fluid moving part includes: a baffle provided in the fluid moving hole and provided with multiple windows; and a mid-end cap connected to the mid-case from the outside of the fluid moving hole.

Description

Membrane humidifier for fuel cells with baffles

[0001] The present invention relates to a membrane humidifier for a fuel cell equipped with a baffle, and more particularly, to a membrane humidifier for a fuel cell equipped with a baffle that can improve the fluid distribution of a large-capacity membrane humidifier by combining a fluid moving part through which fluid flows in and out to a mid-case, including a baffle and a mid-end cap.

[0002] A fuel cell is a power-generating battery that combines hydrogen and oxygen to produce electricity. Unlike conventional chemical cells like batteries or accumulators, fuel cells can continuously produce electricity as long as hydrogen and oxygen are supplied. They also have the advantage of no heat loss, making them about twice as efficient as internal combustion engines.

[0003] A fuel cell system includes a stack, which is an electricity-generating assembly of unit fuel cells composed of an air electrode and a fuel electrode, an air supply device for supplying air to the air electrode of the fuel cell, and a hydrogen supply device for supplying hydrogen to the fuel electrode of the fuel cell.

[0004] In order for the ion exchange membrane of the membrane-electrode assembly (MEA) of the polymer fuel cell of the fuel cell system to function smoothly, an appropriate amount of moisture is required, and for this purpose, a humidifier is provided in the air supply device of the fuel cell system to humidify the air supplied to the fuel cell.

[0005] The humidifier uses the moisture in the high-temperature, humid exhaust gas discharged from the cathode of the fuel cell to humidify the dry gas supplied through the air compressor of the air supply device, and supplies the humidified air to the cathode of the fuel cell.

[0006] Fuel cell humidifiers utilize a membrane humidification method. These humidifiers achieve membrane humidification through a gas-to-gas moisture exchange process between the high-temperature, humid exhaust gas discharged from the fuel cell's cathode and the dry gas supplied by the air compressor.

[0007] A fuel cell humidifier may include a cartridge in which a humidifying membrane made of hollow fiber is placed. Drying gas passes through the hollow fiber membrane through one side and the other side of the cartridge, and an opening (window) is provided on the side of the cartridge that opens to the outside.

[0008] Exhaust gas flows into the cartridge through the above-mentioned opening of the cartridge, and the exhaust gas flowing into the cartridge exchanges moisture with the dry gas passing through the hollow fiber membrane.

[0009] However, conventional cartridge-based fuel cell humidifiers have the following problems: Recently, demand for high-power fuel cell humidifiers has been increasing, and large-capacity fuel cell humidifiers are being developed to meet the growing demand for high-power fuel cell humidifiers.

[0010] To implement a humidifier for high-power fuel cells, the housing volume may be increased and multiple cartridges may be installed within the housing. The number of cartridges installed within the housing may vary depending on the amount of humidified air supplied to the fuel cell, and the number of cartridges may increase when high power is required.

[0011] However, as the housing volume increases and the number of cartridges contained within the housing increases, there is a problem in which the flow distribution within the housing deteriorates. Specifically, when three or more cartridges are arranged sequentially within the housing, the characteristics of a high-power membrane humidifier cause dead zones where the fluid does not reach well, resulting in a deterioration in the flow distribution.

[0012] The present invention is intended to solve the above-described problems, and more particularly, relates to a membrane humidifier for a fuel cell, which includes a baffle and a mid-end cap, and which can improve the flow distribution of a large-capacity membrane humidifier by combining a fluid moving part through which fluid flows in and out to a mid-case.

[0013] A membrane humidifier for a fuel cell equipped with a baffle according to one embodiment is a membrane humidifier for a fuel cell that humidifies a gas to be supplied to a fuel cell stack, the membrane humidifier comprising: a mid-case having a fluid movement hole through which a fluid passes; a fluid movement unit coupled to the fluid movement hole of the mid-case; and a cartridge disposed inside the mid-case and having a humidifying membrane; wherein the fluid movement unit is characterized by including a baffle inserted into the fluid movement hole and having a plurality of windows, and a mid-end cap coupled to the mid-case on the outside of the fluid movement hole.

[0014] The fluid moving part of the membrane humidifier for a fuel cell equipped with a baffle according to one embodiment includes a fluid port coupled to one side of the mid end cap, and the fluid port may be coupled to one side of the mid end cap, and the mid case may be coupled to the other side of the mid end cap.

[0015] The fluid moving part of the membrane humidifier for a fuel cell equipped with a baffle according to one embodiment may include a first packing member inserted between the mid-end cap and the fluid port.

[0016] In one embodiment, a first packing groove into which the first packing member can be inserted may be provided on one side of the mid-end cap of the membrane humidifier for a fuel cell equipped with a baffle.

[0017] The other side of the mid-end cap of the membrane humidifier for a fuel cell equipped with a baffle according to one embodiment may have a larger cross-sectional area than one side of the mid-end cap.

[0018] The fluid moving part of the membrane humidifier for a fuel cell equipped with a baffle according to one embodiment may include a second packing member inserted between the mid-case and the mid-end cap.

[0019] In the above-described mid-case of the membrane humidifier for a fuel cell equipped with a baffle according to one embodiment, a second packing groove into which the second packing member can be inserted may be provided.

[0020] The second packing member of the membrane humidifier for a fuel cell equipped with a baffle according to one embodiment includes a main body portion arranged on the outside of the fluid movement hole, and a protrusion portion protruding from the main body portion, and the protrusion portion can be inserted into the second packing groove.

[0021] The main body of the membrane humidifier for a fuel cell equipped with a baffle according to one embodiment covers the baffle while being in contact with the upper portion of the baffle, and the protrusion can be inserted into the second packing groove formed at a point spaced outward from the fluid movement hole into which the baffle is inserted on the inside.

[0022] The baffle of a membrane humidifier for a fuel cell according to one embodiment may include a lower plate having a plurality of the windows, and a side plate protruding upward along an outer edge of the lower plate.

[0023] The side plate of the membrane humidifier for a fuel cell equipped with a baffle according to one embodiment may be provided with a through hole.

[0024] In a membrane humidifier for a fuel cell equipped with a baffle according to one embodiment, a coupling portion protruding outward from the side plate of the baffle is provided on the upper part of the side plate, and a coupling groove extending outward from the fluid movement hole of the mid-case is provided on the upper part of the fluid movement hole, and the coupling portion can be seated in the coupling groove.

[0025] The baffle of the membrane humidifier for a fuel cell equipped with a baffle according to one embodiment may include a plurality of openings through which a fluid moves while a plurality of windows are provided, and a plurality of blocking portions provided between the openings to block the movement of the fluid.

[0026] The number of openings provided in the baffle of the membrane humidifier for a fuel cell according to one embodiment may be equal to the number of cartridges arranged along the transverse direction of the mid-case.

[0027] The fluid movement hole provided in the mid-case of the membrane humidifier for a fuel cell equipped with a baffle according to one embodiment may be open in any one of the directions of the upper direction of the mid-case, the lower direction of the mid-case, the side direction of the mid-case, and the diagonal direction of the mid-case.

[0028] The side wall of the mid-end cap of the membrane humidifier for a fuel cell equipped with a baffle according to one embodiment may be provided with a sloped portion.

[0029] The present invention relates to a membrane humidifier for a fuel cell equipped with a baffle, and has the advantage of improving the fluid distribution of a large-capacity membrane humidifier by combining a fluid moving part through which fluid flows in and out with a mid-end cap to a mid-case.

[0030] In addition, the present invention has the advantage of improving the flow distribution of a membrane humidifier by first distributing the flow through a mid-end cap whose cross-sectional area increases from one side to the other, and secondarily distributing the flow through a baffle before the flow reaches the cartridge.

[0031] In addition, the present invention has the advantage of improving the humidification performance of a membrane humidifier by dispersing the flow through a baffle and a mid-end cap in a high-power membrane humidifier equipped with three or more cartridges to improve the flow distribution.

[0032] In addition, the present invention has the advantage of improving the durability of a membrane humidifier by improving the flow distribution by dispersing the flow through a baffle and a mid-end cap in a high-power membrane humidifier equipped with three or more cartridges.

[0033] In addition, the present invention has an advantage in that it can improve the sealing between the fluid moving part and the mid case by using a first packing member provided between the fluid port and the mid end cap and a second packing member arranged between the mid end cap and the mid case.

[0034] In addition, the present invention has the advantage of simultaneously securing the stability of the baffle while improving the sealing performance between the mid-case and the mid-end cap through the second packing member.

[0035] FIG. 1 is a drawing showing a fluid moving part including a baffle and a mid-end cap according to an embodiment of the present invention being coupled to a mid-case.

[0036] FIG. 2 is a drawing showing the direction in which fluid moves when a fluid moving part according to an embodiment of the present invention is coupled to a mid-case.

[0037] FIG. 3 is a drawing showing a fluid port, a first packing member, and a mid-end cap according to an embodiment of the present invention.

[0038] FIG. 4 is a drawing showing a mid-end cap, a second packing member, a baffle, and a mid-case according to an embodiment of the present invention.

[0039] FIG. 5 is a cross-sectional view showing a state in which a mid-end cap, a second packing member, and a baffle are combined with a mid-case according to an embodiment of the present invention.

[0040] Figure 6 is a perspective view showing a baffle according to an embodiment of the present invention.

[0041] Figure 7 is a plan view showing a baffle according to an embodiment of the present invention.

[0042] Figure 8 is a drawing showing a flow analysis of a membrane humidifier without a baffle and a mid-end cap, and in which the fluid port is coupled to the mid-case.

[0043] FIG. 9 is a drawing showing a flow analysis of a membrane humidifier having a mid-end cap in a fluid moving section according to an embodiment of the present invention.

[0044] FIG. 10 is a drawing showing a flow analysis of a membrane humidifier having a mid-end cap and a baffle in a fluid moving section according to an embodiment of the present invention.

[0045] FIG. 11 is a drawing showing a fluid movement hole according to an embodiment of the present invention being open in a lateral or diagonal direction.

[0046] FIG. 12 is a drawing showing that a side wall of a mid-end cap according to an embodiment of the present invention has a sloped portion.

[0047] This specification clarifies the scope of the present invention and explains the principles of the invention and discloses embodiments thereof to enable those skilled in the art to practice the invention. The disclosed embodiments may be implemented in various forms.

[0048] Expressions such as “includes” or “may include” that may be used in various embodiments of the present invention indicate the existence of the disclosed function, operation, or component, etc., and do not limit one or more additional functions, operations, or components, etc. In addition, in various embodiments of the present invention, it should be understood that terms such as “includes” or “has” are intended to specify the existence of a feature, number, step, operation, component, part, or combination thereof described in the specification, and do not exclude in advance the possibility of the existence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0049] When a component is referred to as being "connected, coupled" to another component, it should be understood that while the component may be directly connected or coupled to the other component, there may also be a new component between the component and the other component. Conversely, when a component is referred to as being "directly connected" or "directly coupled" to another component, it should be understood that no new component exists between the component and the other component.

[0050] The terms "first," "second," etc., used herein may be used to describe various components, but the components should not be limited by the terms. The terms are used solely to distinguish one component from another.

[0051] The present invention relates to a membrane humidifier for a fuel cell equipped with a baffle, and more particularly, to a membrane humidifier for a fuel cell equipped with a baffle, which comprises a baffle and a mid-end cap, and which improves the flow distribution of a large-capacity membrane humidifier by coupling a fluid moving portion through which fluid flows in and out to a mid-case. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0052] A membrane humidifier for a fuel cell equipped with a baffle according to an embodiment of the present invention includes a mid-case (110), a cartridge (130), and a fluid moving part (140).

[0053] Referring to FIGS. 1 and 2, the mid-case (110) is provided with a fluid passage hole (111) through which a fluid passes, and the mid-case (110) may be a housing of a membrane humidifier for a fuel cell.

[0054] The fluid movement hole (111) provided in the above mid-case (110) may be a hole formed on the outside of the mid-case (110). Fluid may be introduced into the inside of the mid-case (110) through the fluid movement hole (111), and fluid inside the mid-case (110) may be discharged to the outside through the fluid movement hole (111).

[0055] The fluid movement unit (140) is arranged in the fluid movement hole (111), and the fluid movement unit (140) may be an inlet / outlet through which the fluid moves. According to an embodiment of the present invention, the fluid movement unit (140) may include a fluid inlet (141) that moves the fluid into the mid-case (110), and a fluid discharge unit (142) that discharges the fluid inside the mid-case (110) to the outside.

[0056] According to an embodiment of the present invention, an end cap (120) may be coupled to the mid case (110). The end cap (120) is coupled to one side and the other side of the mid case (110).

[0057] The above end cap (120) may be provided with an air inlet (121) capable of supplying dry air to the mid case (110) and an air discharge unit (122) capable of discharging humidified air from the mid case (110).

[0058] Specifically, the end cap (120) coupled to one side of the mid case (110) may be provided with the air discharge portion (122), and the end cap (120) coupled to the other side of the mid case (110) may be provided with the air inlet portion (121). The air discharge portion (122) is connected to a fuel cell stack, and humidified air discharged through the air discharge portion (122) may be supplied to the fuel cell stack.

[0059] High temperature and humid exhaust gas discharged from the fuel cell stack can be introduced into the mid-case (110) through the fluid inlet (141) provided in the mid-case (110).

[0060] The exhaust gas introduced into the mid-case (110) supplies moisture to the dry air supplied to the mid-case (110) through the air inlet (121) of the end cap (120).

[0061] The exhaust gas that has supplied moisture to the dry air can be discharged to the outside through the fluid discharge unit (142) provided in the mid-case (110). The dry air humidified through the mid-case (110) is discharged through the air discharge unit (122), and the humidified air is supplied to the fuel cell stack.

[0062] According to an embodiment of the present invention, the end cap (120) may be coupled to one side and the other side of the mid case (110), but the end cap (120) may also be formed integrally with the mid case (110).

[0063] Referring to Fig. 2, the cartridge (130) is placed inside the mid-case (110) and is provided with a humidifying membrane. The cartridge (130) may include an inner case in which the humidifying membrane is placed and a fixing member for fixing the humidifying membrane on one side and the other side of the inner case.

[0064] The above humidifying membrane may be arranged inside the inner case. The humidifying membrane may be a humidifying membrane that exchanges moisture between exhaust gas and dry air, and one or more humidifying membranes may be provided inside the inner case. According to an embodiment of the present invention, the humidifying membrane may be formed of a hollow fiber membrane. However, the present invention is not limited thereto, and the humidifying membrane may be formed of various types of humidifying membranes as long as it can exchange moisture between exhaust gas and dry air.

[0065] The above fixing member fixes the humidifying film to the inner case on one side and the other side of the inner case, and the fixing member may be formed of a potting layer. The fixing member can isolate the internal space of the inner case, and by providing the fixing member on one side and the other side of the inner case, dry air can only move through the interior of the humidifying film or the hollow space of the humidifying film.

[0066] According to an embodiment of the present invention, a plurality of cartridges (130) may be provided inside the mid-case (110). Referring to FIG. 2, a plurality of cartridges (130) may be arranged in a transverse direction inside the mid-case (110).

[0067] When a plurality of the cartridges (130) are arranged inside the mid-case (110), the flow distribution within the mid-case (110) may deteriorate. Specifically, when three or more of the cartridges (130) are arranged in the transverse direction inside the mid-case (110), there is a problem in that the flow distribution deteriorates as a dead zone occurs where the fluid does not reach well.

[0068] Referring to FIGS. 3 and 4, the fluid moving unit (140) according to an embodiment of the present invention may include a baffle (150) and a mid end cap (160) to improve the flow distribution inside the mid case (110).

[0069] The above baffle (150) is provided in the fluid movement hole (111) and is provided with a plurality of windows (152). The mid-end cap (160) is connected to the mid-case (110) from the outside of the fluid movement hole (111). The fluid movement unit (140) can improve the flow distribution inside the mid-case (110) through the baffle (150) and the mid-end cap (160).

[0070] According to an embodiment of the present invention, the baffle (150) may be formed integrally with the mid-case (110). In addition, the baffle (150) may be formed as a member inserted into the fluid movement hole (111) of the mid-case (110), as shown in FIG. 1.

[0071] According to an embodiment of the present invention, the mid-end cap (160) may be formed integrally with the mid-case (110) and connected thereto. In addition, the mid-end cap (160) may be formed of a member that is separated from the mid-case (110) and coupled to the mid-case (110), as shown in FIG. 1. Hereinafter, the baffle (150) and the mid-end cap (160) will be described based on the case where the baffle (150) and the mid-end cap (160) are formed of members that are separated from the mid-case (110).

[0072] According to an embodiment of the present invention, the fluid moving unit (140) can be applied to the fluid inlet unit (141) that moves the fluid into the mid-case (110), and the fluid moving unit (140) can be applied to the fluid discharge unit (142) that discharges the fluid inside the mid-case (110) to the outside.

[0073] Hereinafter, the fluid movement unit (140) will be described in detail based on the fact that the fluid movement unit (140) is applied to the fluid inlet unit (141) that moves the fluid into the mid-case (110).

[0074] Referring to FIGS. 3 and 4, the mid end cap (160) is connected to the mid case (110) from the outside of the fluid movement hole (111), and the other side of the mid end cap (160) can be formed to have a larger cross-sectional area than one side of the mid end cap (160).

[0075] Specifically, the cross-sectional area of ​​the mid end cap (160) increases from one side to the other side, so that the area through which fluid can move increases from one side to the other side of the mid end cap (160).

[0076] Referring to FIG. 3, the fluid moving part (140) according to an embodiment of the present invention may include a fluid port (170) provided on one side of the mid end cap (160). The fluid port (170) may be a port provided on one side of the mid end cap (160) and for introducing fluid into the mid end cap (160). According to an embodiment of the present invention, the mid end cap (160) and the fluid port (170) may be formed integrally.

[0077] The fluid port (170) may be provided on one side of the mid end cap (160), and the mid case (110) may be connected to the other side of the mid end cap (160). As the fluid port (170) is provided on one side of the mid end cap (160), fluid may flow into one side of the mid end cap (160).

[0078] Here, the mid end cap (160) may be formed integrally with the mid case (110) and connected to the mid case (110). In addition, the mid end cap (160) may be formed of a member separate from the mid case (110).

[0079] As described above, the cross-sectional area of ​​the mid end cap (160) increases from one side to the other side, and the area through which fluid can move increases from one side to the other side of the mid end cap (160).

[0080] Accordingly, the fluid flowing into one side of the mid end cap (160) can be dispersed as it moves to the other side of the mid end cap (160). The area of ​​the other side of the mid end cap (160) can be equal to or slightly larger than the area of ​​the fluid movement hole (111) formed in the mid case (110).

[0081] The other side of the mid end cap (160) is connected to the fluid movement hole (111) formed in the mid case (110), and the fluid passing through the other side of the mid end cap (160) passes through the fluid movement hole (111) and flows into the inside of the mid case (110).

[0082] The fluid flowing into one side of the mid end cap (160) can be dispersed as it moves to the other side of the mid end cap (160), and thus, the fluid flowing into one side of the mid end cap (160) can be dispersed when it passes through the fluid movement hole (111). This makes it possible to improve the flow distribution of the fluid flowing into the mid case (110).

[0083] The above baffle (150) can be formed integrally with the mid-case (110), and the baffle (150) can be formed of a member separate from the mid-case (110) and inserted into the fluid movement hole (110).

[0084] Referring to FIGS. 4 and 5, the baffle (150) can be inserted into the fluid movement hole (111). Referring to FIG. 5, after the baffle (150) is inserted into the fluid movement hole (111) formed in the mid-case (110), the mid-end cap (160) can be coupled to the mid-case (110). The mid-end cap (160) can be coupled to the mid-case (110) via a bolt (10), etc.

[0085] The above baffle (150) is provided with a plurality of the above windows (152). Referring to FIGS. 6 and 7, the above baffle (150) may include a lower plate (151) provided with a plurality of the above windows (152), and a side plate (153) protruding upward along the outer edge of the lower plate (151).

[0086] The lower plate (151) may be formed in a plate shape, and the lower plate (151) is provided with a plurality of windows (152). According to an embodiment of the present invention, the window (152) may be a hole penetrating the lower plate (151), and the plurality of windows (152) may be formed at various points of the lower plate (151).

[0087] The side plate (153) may be formed in a plate shape, and the side plate (153) may extend vertically along the outer edge of the lower plate (151). The side plate (153) may be provided with a through hole (154) penetrating the side plate (153).

[0088] According to an embodiment of the present invention, the through hole (154) may be a hole formed in the side plate (153), and the side plate (153) may be provided with a plurality of the through holes (154). The plurality of the through holes (154) may be formed at various points of the side plate (153).

[0089] Specifically, the through hole (154) may be formed at a point where the lower plate (151) and the side plate (153) are connected. Additionally, the through hole (154) may be formed at a midpoint of the side plate (153).

[0090] According to an embodiment of the present invention, the through hole (154) may include a first through hole (154a) formed between the lower plate (151) and the side plate (153) while being provided at the lower portion of the side plate (153). The first through hole (154a) may be a hole formed between the lower plate (151) and the side plate (153).

[0091] In addition, according to an embodiment of the present invention, the through hole (154) may include a second through hole (154b) that is provided on the upper portion of the side plate (153) and penetrates the side plate (153) in the longitudinal direction. The second through hole (154b) may be a hole that penetrates the side plate (153) in the longitudinal direction.

[0092] A membrane humidifier for a fuel cell equipped with a baffle according to an embodiment of the present invention can improve the flow distribution inside the mid case (110) through the baffle (150) and the mid end cap (160).

[0093] A membrane humidifier for a fuel cell equipped with a baffle according to an embodiment of the present invention can primarily disperse the flow of fluid flowing into the mid-case (110) through the mid-end cap (160) whose cross-sectional area increases from one side to the other.

[0094] Specifically, the fluid flowing into one side of the mid end cap (160) can be dispersed as it moves to the other side of the mid end cap (160), and thus, the fluid flowing into one side of the mid end cap (160) can be dispersed when it passes through the mid end cap (160). Through this, the flow of the fluid flowing into the mid case (110) can be primarily dispersed.

[0095] The baffle (150) can be inserted into the fluid movement hole (111), and the membrane humidifier for a fuel cell equipped with a baffle according to an embodiment of the present invention can secondarily disperse the flow of fluid flowing into the mid-case (110) through the baffle (150).

[0096] Specifically, the fluid passing through the mid end cap (160) and moving to the fluid movement hole (111) can be dispersed while passing through the plurality of windows (152) and the through hole (154) provided in the baffle (150). Through this, the flow of the fluid flowing into the mid case (110) can be secondarily dispersed.

[0097] The upper portion of the side plate (153) of the baffle (150) may be provided with a connecting portion (155) that protrudes outward from the side plate (153). Referring to Fig. 5, the connecting portion (155) may be a portion that protrudes in a wing shape from the upper portion of the side plate (153).

[0098] In addition, a coupling groove (112) extending outwardly from the fluid movement hole (111) may be provided on the upper portion of the fluid movement hole (111) of the mid-case (110). Referring to Fig. 5, the coupling groove (112) may be a groove extending outward from the upper portion of the fluid movement hole (111).

[0099] According to an embodiment of the present invention, the baffle (150) can be inserted into the fluid movement hole (111) when the coupling portion (155) comes into contact with the coupling groove (112). Specifically, the baffle (150) can be inserted and positioned in the fluid movement hole (111) when the coupling portion (155) of the baffle (150) is seated in the coupling groove (112).

[0100] Referring to FIG. 3, the fluid moving part (140) according to an embodiment of the present invention may include a first packing member (180) provided between the mid end cap (160) and the fluid port (170).

[0101] The first packing member (180) can seal between the mid end cap (160) and the fluid port (170), and the first packing member (180) can be formed in a ring shape.

[0102] Referring to Fig. 3, a first packing groove (161) into which the first packing member (180) can be inserted may be provided on one side of the mid end cap (160). The first packing groove (161) is a groove formed at one end of the mid end cap (160), and the first packing groove (161) may be formed in a groove shape that is dug so that the first packing member (180) can be inserted.

[0103] By sealing between the mid end cap (160) and the fluid port (170) through the first packing member (180), the airtightness between the mid end cap (160) and the fluid port (170) can be improved.

[0104] Referring to FIG. 4, the fluid moving part (140) according to an embodiment of the present invention may include a second packing member (190) provided between the mid case (110) and the mid end cap (160).

[0105] The second packing member (190) can seal between the mid case (110) and the mid end cap (160), and the second packing member (190) can be formed in a ring shape.

[0106] Referring to FIGS. 4 and 5, the mid-case (110) may be provided with a second packing groove (113) into which the second packing member (190) may be inserted. The second packing groove (113) is a groove formed on the outside of the fluid movement hole (111) formed in the mid-case (110), and the second packing groove (113) may be formed in a groove shape that is dug so that the second packing member (190) may be inserted.

[0107] Referring to FIG. 5, the second packing member (190) according to an embodiment of the present invention may include a main body portion (191) and a protrusion portion (192). The main body portion (191) is arranged on the outside of the fluid movement hole (111), and sealing between the mid case (110) and the mid end cap (160) can be performed through the main body portion (191).

[0108] The above protrusion (192) protrudes from the main body (191), and the protrusion (192) may be inserted into the second packing groove (113). When the protrusion (192) is inserted into the second packing groove (113), the second packing member (190) can be fixed between the mid case (110) and the mid end cap (160).

[0109] Specifically, when the protrusion (192) is inserted into the second packing groove (113) and the mid end cap (160) is then coupled to the mid case (110), the mid end cap (160) covers the outer side of the protrusion (192) and the second packing member (190) can be fixed between the mid case (110) and the mid end cap (160).

[0110] According to an embodiment of the present invention, the main body (191) may cover the baffle (150) while coming into contact with the upper portion of the baffle (150). Referring to FIG. 5, the main body (191) may come into contact with the upper portion of the side plate (153) of the baffle (150), and the main body (191) may extend to the outside of the fluid movement hole (111) while covering the coupling portion (155) provided in the side plate (153).

[0111] Referring to FIG. 5, the protrusion (192) can be inserted into the second packing groove (113) formed at a point spaced outward from the fluid movement hole (111) into which the baffle (150) is inserted.

[0112] The second packing groove (113) may be formed at a point spaced apart from the fluid movement hole (111) into which the baffle (150) is inserted. Specifically, the second packing groove (113) may be formed at a point spaced apart in the outer direction from the coupling groove (112) provided in the fluid movement hole (111).

[0113] The above protrusion (192) can be inserted into the second packing groove (113) formed at a point spaced apart in the outer direction of the coupling groove (112) provided in the fluid movement hole (111), thereby enabling the upper portion of the baffle (150) to be covered with the main body (191).

[0114] The second packing member (190) according to an embodiment of the present invention can simultaneously secure the fixation of the baffle (150) while improving the sealing performance between the mid case (110) and the mid end cap (160).

[0115] The protrusion (192) of the second packing member (190) is inserted into the second packing groove (113) of the mid case (110), and after the protrusion (192) is inserted into the second packing groove (113), the mid case (110) and the mid end cap (160) are combined so that the mid end cap (160) covers the outer side of the protrusion (192), thereby stably fixing the second packing member (190).

[0116] At this time, the main body (191) of the second packing member (190) can pressurize the baffle (150) by coming into contact with the upper portion of the baffle (150). Referring to FIG. 5, the main body (191) can extend to the outside of the fluid movement hole (111) while covering the coupling portion (155) provided in the side plate (153), thereby pressurizing the baffle (150) with the main body (191).

[0117] By fixing the second packing member (190) through the second packing groove (113) of the mid case (110) and the mid end cap (160), and by pressurizing and fixing the baffle (150) through the second packing member (190), the stability of the baffle (150) can be secured. At the same time, the sealing performance between the mid case (110) and the mid end cap (160) can be improved through the second packing member (190).

[0118] The baffle (150) according to an embodiment of the present invention may include a plurality of windows (152), a plurality of openings (156) through which fluid moves, and a plurality of blocking parts (157) provided between the openings (156) to block the movement of fluid.

[0119] Referring to FIG. 7, the opening portion (156) may be a space in which a plurality of windows (152) are formed and a fluid moves, and the blocking portion (157) may be a space formed between the plurality of opening portions (156) and in which the windows (152) are not formed.

[0120] According to an embodiment of the present invention, the number of openings (156) provided in the baffle (150) may be equal to the number of cartridges (130) arranged along the transverse direction of the mid-case (110).

[0121] When dispersing the fluid passing through the fluid movement hole (111) through the baffle (150), it is preferable to arrange the plurality of windows (152) of the baffle (150) in the direction in which a large amount of fluid flows into the cartridge (130).

[0122] To this end, the baffle (150) can separate the opening portion (156) provided with a plurality of windows (152) through which the fluid passes, and the blocking portion (157) through which the fluid does not pass without the windows (152) being provided.

[0123] According to an embodiment of the present invention, when the baffle (150) is provided with a plurality of openings (156), it is preferable to arrange the plurality of openings (156) so as to correspond to the plurality of cartridges (130) arranged along the transverse direction of the mid-case (110).

[0124] For this purpose, the number of openings (156) provided in the baffle (150) may be equal to the number of cartridges (130) arranged along the transverse direction of the mid-case (110).

[0125] Fig. 8 is a drawing showing a flow analysis of a membrane humidifier in which a baffle (150) and a mid-end cap (160) are not provided and a fluid port (170) is coupled to a mid-case (110). Fig. 9 is a drawing showing a flow analysis of a membrane humidifier in which the fluid moving part (140) is provided with the mid-end cap (160) according to an embodiment of the present invention. Fig. 10 is a drawing showing a flow analysis of a membrane humidifier in which the fluid moving part (140) is provided with the mid-end cap (160) and the baffle (150) according to an embodiment of the present invention.

[0126] When a plurality of the cartridges (130) are provided inside the above mid-case (110), if the baffle (150) and mid-end cap (160) are not provided as shown in FIG. 8, there is a risk that the flow distribution inside the mid-case (110) will deteriorate.

[0127] A membrane humidifier for a fuel cell equipped with a baffle according to an embodiment of the present invention can primarily disperse flow through the mid-end cap (160) whose cross-sectional area increases from one side to the other, and can improve flow distribution within the mid-case (110) by secondarily distributing the flow through the baffle (150) before the flow reaches the cartridge (130).

[0128] Referring to FIG. 9, a membrane humidifier for a fuel cell equipped with a baffle according to an embodiment of the present invention can improve the flow distribution inside the mid case (110) by primarily distributing the flow through the mid end cap (160) whose cross-sectional area increases from one side to the other.

[0129] Referring to FIG. 10, a membrane humidifier for a fuel cell equipped with a baffle according to an embodiment of the present invention can further improve the flow distribution inside the mid case (110) by first distributing the flow through the mid end cap (160) and secondarily distributing the flow through the baffle (150) before the flow reaches the cartridge (130).

[0130] According to an embodiment of the present invention, the fluid movement hole (111) provided in the mid-case (110) may be open in any one of the upper direction of the mid-case (110), the lateral direction of the mid-case (110), and the diagonal direction of the mid-case (110).

[0131] Referring to FIG. 1, the fluid movement hole (111) provided in the mid-case (110) may be open in the upper direction of the mid-case (110). The fluid movement hole (111) may be provided in the upper portion of the mid-case (110) and may be open in the upper direction of the mid-case (110). Here, the upper direction of the mid-case (110) may be a direction looking upwards at the mid-case (110) with reference to FIG. 1.

[0132] In addition, the fluid movement hole (111) provided in the mid-case (110) may be open in the downward direction of the mid-case (110). The fluid movement hole (111) may be provided at the lower portion of the mid-case (110) and may be open in the downward direction of the mid-case (110). Here, the downward direction of the mid-case (110) may be a direction looking downward of the mid-case (110) with reference to FIG. 1.

[0133] Referring to Fig. 11, the fluid movement hole (111) provided in the mid-case (110) may be open in the lateral direction of the mid-case (110). Specifically, the point where the fluid movement hole (111) is provided in the mid-case (110) may be vertically bent.

[0134] As the point where the fluid movement hole (111) is provided in the mid-case (110) is vertically bent, the fluid movement hole (110) may be open in the lateral direction of the mid-case (110). The fluid movement hole (111) may be provided at the upper or lower portion of the mid-case (110) and may be open in the lateral direction of the mid-case (110). Here, the lateral direction of the mid-case (110) may be a direction looking left and right of the mid-case (110) with reference to FIG. 1 and FIG. 11.

[0135] Referring to Fig. 11, the fluid movement hole (111) provided in the mid-case (110) may be open in a diagonal direction of the mid-case (110). Specifically, the point where the fluid movement hole (111) is provided in the mid-case (110) may be bent in a diagonal direction.

[0136] As the point where the fluid movement hole (111) is provided in the mid-case (110) is bent in a diagonal direction, the fluid movement hole (110) can be open in the diagonal direction of the mid-case (110). The fluid movement hole (111) can be provided at the upper or lower portion of the mid-case (110) and can be open in the diagonal direction of the mid-case (110).

[0137] Here, the diagonal direction of the mid-case (110) may be a direction formed between the side direction of the mid-case (110) and the upper direction of the mid-case (110) or between the side direction of the mid-case (110) and the lower direction of the mid-case (110) based on FIGS. 1 and 11.

[0138] In this way, by forming the fluid movement hole (111) provided in the mid-case (110) to be open in any one of the upper direction of the mid-case (110), the lower direction of the mid-case (110), the lateral direction of the mid-case (110), and the diagonal direction of the mid-case (110), the direction of the fluid flowing into the mid-case (110) can be formed in various directions. Through this, the position of the fluid port (170) through which the fluid is discharged or introduced can be changed in various ways according to the design conditions.

[0139] Referring to FIG. 12, when the fluid movement hole (111) provided in the mid-case (110) is open in either the lateral direction of the mid-case (110) or the diagonal direction of the mid-case (110), an inclined portion (162) may be provided on the side wall of the mid-end cap (160).

[0140] Specifically, the inclined surface (162) may be provided at a side wall point of the mid-end cap (160) that faces or is opposite to the inlet point (171) of the fluid port (170). Referring to Fig. 12, the inclined portion (162) may be formed in a round shape. Specifically, the inclined portion (162) may be formed in a round shape in which a curvature is formed.

[0141] In addition, the inclined portion (162) may also be formed as a flat surface that is bent at a specified angle with respect to a direction parallel to the direction in which air is introduced into the fluid port (170). Specifically, the inclined portion (162) may be formed as an inclined surface that is bent at a specified angle with respect to a direction parallel to the direction in which air is introduced into the fluid port (170).

[0142] Here, the inclined portion (162) is preferably bent at an acute angle with respect to the direction parallel to the direction in which air flows into the fluid port (170), but may also be bent at a right angle. In addition, it may include two inclined surfaces bent at different angles with respect to the direction parallel to the direction in which air flows into the fluid port (170).

[0143] In this way, by providing the inclined portion (162) at the side wall point of the mid end cap (160), the fluid passing through the mid end cap (160) can be smoothly moved.

[0144] Referring to Fig. 12, the mid end cap (160) may additionally be provided with a mid end cap baffle (163). The mid end cap baffle (163) may be the same as the baffle (150), and the features applied to the baffle (150) may be applied to the mid end cap baffle (163).

[0145] By additionally providing the mid end cap baffle (163) inside the mid end cap (160), the flow distribution of the fluid moving through the mid end cap (160) can be improved.

[0146] The membrane humidifier for a fuel cell equipped with a baffle according to the embodiment of the present invention described above has the following effects.

[0147] A membrane humidifier for a fuel cell equipped with a baffle according to an embodiment of the present invention includes a baffle and a mid-end cap, and has the advantage of improving the fluid distribution of a large-capacity membrane humidifier by combining a fluid moving part through which fluid flows in and out to a mid-case.

[0148] In addition, the membrane humidifier for a fuel cell equipped with a baffle according to an embodiment of the present invention has the advantage of improving the flow distribution of the membrane humidifier by first distributing the flow through a mid-end cap whose cross-sectional area increases from one side to the other, and secondarily distributing the flow through the baffle before the flow reaches the cartridge.

[0149] In addition, the membrane humidifier for a fuel cell equipped with a baffle according to an embodiment of the present invention has the advantage of improving the humidification performance of the membrane humidifier by improving the flow distribution by dispersing the flow through the baffle and mid-end cap in a high-power membrane humidifier equipped with three or more cartridges.

[0150] In addition, the membrane humidifier for a fuel cell equipped with a baffle according to an embodiment of the present invention has the advantage of improving the durability of the membrane humidifier by improving the flow distribution by dispersing the flow through the baffle and mid-end cap in a high-power membrane humidifier equipped with three or more cartridges.

[0151] In addition, the membrane humidifier for a fuel cell equipped with a baffle according to an embodiment of the present invention has the advantage of improving the airtightness between the fluid moving portion and the mid-case by using a first packing member provided between the fluid port and the mid-end cap and a second packing member arranged between the mid-end cap and the mid-case.

[0152] In addition, the membrane humidifier for a fuel cell equipped with a baffle according to an embodiment of the present invention has the advantage of simultaneously securing the stability of the baffle while improving the sealing performance between the mid-case and the mid-end cap through the second packing member.

[0153] While the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will appreciate that various modifications and variations of the embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

Claims

1. In a membrane humidifier for a fuel cell that humidifies gas to be supplied to a fuel cell stack, A mid-case having a fluid passage through which the fluid passes; A fluid moving part arranged in the fluid moving hole of the above mid-case; A cartridge is disposed inside the above mid-case and includes a humidifying membrane; The above fluid moving part, A baffle provided in the above fluid moving hole and having a plurality of windows, A membrane humidifier for a fuel cell having a baffle, characterized by including a mid end cap connected to the mid case on the outside of the fluid moving hole.

2. In paragraph 1, The above fluid moving part includes a fluid port provided on one side of the mid end cap, A membrane humidifier for a fuel cell equipped with a baffle, characterized in that the fluid port is provided on one side of the mid end cap, and the mid case is connected to the other side of the mid end cap.

3. In paragraph 2, The above fluid moving part, A membrane humidifier for a fuel cell equipped with a baffle, characterized by including a first packing member provided between the mid end cap and the fluid port.

4. In paragraph 3, A membrane humidifier for a fuel cell equipped with a baffle, characterized in that one side of the mid end cap is provided with a first packing groove into which the first packing member can be inserted.

5. In paragraph 1, A membrane humidifier for a fuel cell equipped with a baffle, characterized in that the other side of the mid end cap has a larger cross-sectional area than one side of the mid end cap.

6. In paragraph 1, The above fluid moving part, A membrane humidifier for a fuel cell equipped with a baffle, characterized by including a second packing member provided between the mid case and the mid end cap.

7. In paragraph 6, A membrane humidifier for a fuel cell equipped with a baffle, characterized in that the mid-case is provided with a second packing groove into which the second packing member can be inserted.

8. In paragraph 7, The above second packing member, A main body portion positioned outside the above fluid movement hole, Includes a protrusion protruding from the above main body, A membrane humidifier for a fuel cell equipped with a baffle, characterized in that the protrusion is inserted into the second packing home.

9. In paragraph 8, The above main body part covers the baffle while coming into contact with the upper part of the baffle, The above protrusion is, A membrane humidifier for a fuel cell equipped with a baffle, characterized in that the baffle is inserted into the second packing groove formed at a point spaced outwardly from the fluid movement hole into which the baffle is inserted on the inside.

10. In paragraph 1, The above baffle, A lower plate having a plurality of the above windows, A membrane humidifier for a fuel cell having a baffle, characterized by including a side plate protruding upward along the outer edge of the lower plate.

11. In paragraph 10, A membrane humidifier for a fuel cell having a baffle, characterized in that the side plate is provided with a through hole.

12. In paragraph 10, On the upper part of the side plate of the above baffle, a connecting part protruding outward from the side plate is provided, In the upper part of the fluid movement hole of the above mid-case, a joining groove extending to the outside of the fluid movement hole is provided. A membrane humidifier for a fuel cell equipped with a baffle, characterized in that the above-mentioned joint is seated in the above-mentioned joint groove.

13. In paragraph 1, The above baffle, A plurality of openings through which the fluid moves are provided with a plurality of above-mentioned windows, A membrane humidifier for a fuel cell equipped with a baffle, characterized by including a plurality of blocking portions provided between the above-mentioned opening portions and blocking the movement of fluid.

14. In paragraph 1, The fluid moving hole provided in the above mid-case is A membrane humidifier for a fuel cell equipped with a baffle, characterized in that it is open in any one of the upper direction of the mid-case, the lower direction of the mid-case, the lateral direction of the mid-case, and the diagonal direction of the mid-case.

15. In paragraph 1, A membrane humidifier for a fuel cell having a baffle, characterized in that the side wall of the mid-end cap is provided with a slope.

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