JP2010112613A - Humidifying unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a humidifying unit, in which humidifiers can be arranged in a compact manner while simplifying a joint. <P>SOLUTION: Humidifiers 10A-10C are vertically stacked in such a manner that the humidifier 10B is shifted forward relative to the humidifier 10A, and the humidifier 10C is shifted forward relative to the humidifier 10B. An air outlet port 21c1 communicating with the inside of a hollow fiber membrane 12 of the humidifier 10A is connected to an air inlet port 21a3 communicating with the outside of a hollow fiber membrane 12 of the humidifier 10B through a joint 30. An offgas outlet port 21a2 communicating with the outside of the hollow fiber membrane 12 of the humidifier 10A is connected to an offgas inlet port 21b2 communicating with the inside of the hollow fiber membrane 12 of the humidifier 10B through a joint 40. The joints 30 and 40 are disposed in spaces Q1 and Q3 formed by shifting the humidifier 10A and the humidifier 10B. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a humidifying unit formed by combining a plurality of humidifiers.

For example, a square humidification unit configured by combining a plurality of humidifiers provided with hollow fiber membranes has been proposed (see Patent Document 1). However, in the humidification unit described in Patent Document 1, since it is difficult to improve the humidification performance, various humidifiers in which a hollow fiber membrane is accommodated in a case and partitions are provided at both ends of the hollow fiber membrane have been proposed. (For example, refer to Patent Document 2). This type of humidifier is configured so that gas (or water) flows inside the hollow fiber membrane and water (or gas) flows outside the hollow fiber membrane between the partitions.
Japanese Patent Laid-Open No. 10-197016 (FIG. 2) JP-A-8-273687 (FIGS. 3 and 4)

  However, when a plurality of humidifiers described in Patent Document 2 are laminated, the outlet of the humidifier through which the fluid passing through the outside of the hollow fiber membrane is discharged and the outside of the hollow fiber membrane adjacent to the humidifier are passed. Since the inlet of the humidifier to which the fluid is introduced needs to be connected via a joint, both the joint connecting the insides of the hollow fiber membranes and the joint connecting the outsides of the hollow fiber membranes are humidified respectively. There is a problem that the humidification unit is increased in size due to a large protrusion from the main body.

  In addition, by providing an inlet / outlet communicating with the outside of the hollow fiber membrane above and below each humidifier, and connecting the outlet and inlet of the adjacent humidifier with a joint, a joint is formed between the faces where the humidifier and the humidifier face each other. There is a problem in that a space for connection via the air-conditioner is required, the vertical dimension of the humidifying unit increases, and the humidifying unit increases in size. Furthermore, since the joint that connects the insides of the hollow fiber membranes and the joint that connects the outsides of the hollow fiber membranes have different shapes, there is a problem that the number of parts of the joint increases.

  This invention solves the said conventional subject, and aims at providing the humidification unit which can arrange humidifiers compactly and can simplify a joint.

  The present invention relates to a humidification unit in which a plurality of humidifiers containing hollow fiber membranes are stacked, and in one of the humidifiers, a first fluid flows outside the hollow fiber membrane, and a second fluid is the hollow fiber membrane. In the other humidifier adjacent to the one humidifier, the second fluid flows outside the hollow fiber membrane, and the first fluid flows inside the hollow fiber membrane. The adjacent humidifiers are arranged so as to penetrate both planes orthogonal to the gas flow direction inside the hollow fiber membrane, and are displaced in the gas flow direction inside the hollow fiber membrane. The space formed by shifting the position is provided with a joint that connects the opening communicating with the inside of the hollow fiber membrane and the opening communicating with the outside of the hollow fiber membrane. .

  According to this, the humidifiers are arranged with their positions shifted in the gas flow direction inside the hollow fiber membrane, and the first fluid and the second fluid are circulated with the inside and outside of the hollow fiber membrane being exchanged with each other. This makes it possible to place the joint in the space formed by shifting the humidifier. Therefore, the joint does not protrude from the humidifier, and the humidification unit can be configured compactly. Furthermore, since the outlet and the inlet can be close, the joint can be miniaturized and the joint shape can be made common, so the number of joint parts can be reduced and the joint can be simplified. Can be achieved.

  Further, the plurality of humidifiers are adjacent to each other in a step shape. According to this, since it can be made into the state which arranged the width | variety of each humidifier, it can comprise more compactly.

  Further, the flow from the end surface of the humidifier is connected to the lower surface or the upper surface of the adjacent humidifier, and the flow from the upper surface or the lower surface of the humidifier is connected to the end surface of the adjacent humidifier. Features. According to this, the length of the joint connecting the outlet (inlet) communicating with the outside of the hollow fiber membrane and the inlet (outlet) communicating with the inside of the hollow fiber membrane can be minimized.

  The joint may be fastened to the same end face of the plurality of humidifiers to connect the plurality of humidifiers. This makes it possible to reduce the number of components and simplify the manufacturing process.

  According to the present invention, humidifiers can be arranged compactly, and the joint can be simplified.

  FIG. 1 is a block diagram showing an example in which the humidification unit of this embodiment is applied to a fuel cell system, FIG. 2 is an external perspective view showing the humidification unit of this embodiment, and FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG.

  As shown in FIG. 1, a fuel cell system 100 in which the humidifying unit 1 of this embodiment is incorporated is mounted on a fuel cell vehicle (mobile body) (not shown), and includes a fuel cell stack 110, a hydrogen tank 121, an air compressor. 131, the humidification unit 1 etc. are provided.

  The fuel cell stack 110 is a polymer electrolyte fuel cell (PEFC), and a plurality of single cells formed by sandwiching MEA (Membrane Electrode Assembly) with separators (not shown) are stacked. Has been configured. The MEA includes an electrolyte membrane (solid polymer membrane) and a cathode and an anode that sandwich the membrane. Each separator is formed with an anode flow path 111 and a cathode flow path 112 formed of grooves and through holes.

  Further, in the fuel cell stack 110, hydrogen is supplied from the hydrogen tank 121 to the anode via the pipe 121a and the anode flow path 111, and oxygen-containing air takes in the outside air from the air compressor 131, and the pipe 131a and the humidification unit. 1. When supplied to the cathode via the pipe 131b and the cathode flow path 112, an electrode reaction occurs on the catalyst (Pt or the like) contained in the anode and the cathode, and the fuel cell stack 110 is in a state capable of generating power.

  The fuel cell stack 110 in a state where power can be generated in this way and an external load (for example, a motor for traveling) are electrically connected, and when the current is taken out, the fuel cell stack 110 generates power.

  Further, the anode off gas discharged from the anode channel 111 is discharged to the diluter 132 through the pipe 121b. On the other hand, the cathode offgas discharged from the cathode channel 112 is discharged to the diluter 132 via the pipe 131c, the humidification unit 1, and the pipe 132a, and the diluter 132 dilutes unconsumed hydrogen in the anode offgas. It has become. The diluted gas is discharged out of the vehicle via the pipe 132b. The cathode off gas is humid due to water vapor (water) generated by the electrode reaction at the cathode. In addition, since a part of the generated water vapor passes through the electrolyte membrane to the anode side, the anode off gas is also humid.

  As shown in FIG. 2, the humidifying unit 1 discharges air (first fluid) to be humidified from the air compressor 131 (see FIG. 1) toward the cathode channel 112 (see FIG. 1) from the cathode channel 112. The humidifier 10A, 10B, and 10C are combined to humidify with a highly humid cathode off gas (second fluid).

  Each of the humidifiers 10A, 10B, and 10C has a substantially rectangular parallelepiped shape, the humidifier 10A is disposed in the lower stage, the humidifier 10B is shifted forward from the upper surface of the humidifier 10A, and the width direction (left-right direction) ), And the humidifier 10C is stacked on the upper surface of the humidifier 10B while shifting the position forward and aligning the position in the width direction (left-right direction). That is, the humidifier 10B is disposed so as to be shifted forward only with respect to the humidifier 10A, and the humidifier 10C is disposed so as to be shifted only forward in the same manner as described above with respect to the humidifier 10B. It is arranged in steps.

  Each of the humidifiers 10A to 10C has the same shape, and includes a case 21a that has a rectangular tube shape and caps 21b and 21c that cover both ends in the longitudinal direction (front-rear direction) of the case 21a.

  The case 21a of the humidifier 10A is a rectangular tube-like container that accommodates a hollow fiber membrane bundle 11 to be described later, for example, a hard resin such as PC (polycarbonate) or PPO (polyphenylene oxide), or aluminum. It is made of metal. Further, an off-gas inlet 21a1 into which the cathode off-gas (second fluid) from the fuel cell stack 110 is introduced is formed on the lower surface of the case 21a on the front end side. Further, an off-gas outlet 21a2 through which the cathode off-gas is discharged is formed on the upper surface of the case 21a on the rear end side. Further, the cap 21b is formed of a hard resin or metal similarly to the case 21a, and is formed with a tubular air inlet 21b1 into which dried air (air before humidification, first fluid) from the air compressor 131 is introduced. ing. The cap 21c is formed with an air outlet 21c1 through which the air (first fluid) is discharged.

  The other humidifiers 10B and 10C each have a case 21a and caps 21b and 21c formed of the same material and shape as the humidifier 10A. The case 21a of the humidifier 10B has an air inlet 21a3 formed on the lower surface and an air outlet 21a4 formed on the upper surface. Further, the cap 21b of the humidifier 10B has an off-gas inlet 21b2, and the cap 21c has an off-gas outlet 21c2. Further, in the case 21a of the humidifier 10C, an off-gas inlet 21a5 is formed on the lower surface, and an off-gas outlet 21a6 is formed on the upper surface. The cap 21b of the humidifier 10C is formed with an air introduction port 21b3, and the cap 21c is formed with an air outlet port 21c3 through which humidified air discharged toward the fuel cell stack 110 is discharged. Yes.

  In the present embodiment, each end of the air outlet port 21c1, the off gas inlet port 21b2, the off gas outlet port 21c2, and the air inlet port 21b3 corresponds to an opening communicating with the inside of the hollow fiber membrane 12, and the off gas outlet port 21a2. Each end of the air inlet 21a3, the off-gas inlet 21a5, and the air outlet 21a4 corresponds to an opening communicating with the outside of the hollow fiber membrane 12.

  Further, the adjacent humidifiers 10A and 10B are, for example, which of the humidifier 10A and the humidifier 10B with respect to a plane orthogonal to the gas flow direction inside the hollow fiber membrane 12 at the position of the arrow Z (see FIG. 3). Are also arranged in a penetrating manner. That is, the humidifier 10 </ b> A and the humidifier 10 </ b> B are disposed so as to partially overlap each other. The adjacent humidifier 10B and the humidifier 10C are similarly arranged so that both the humidifier 10B and the humidifier 10C penetrate the plane perpendicular to the gas flow direction inside the hollow fiber membrane 12. Has been.

  Further, the air outlet 21 c 1 of the humidifier 10 A and the air inlet 21 a 3 of the humidifier 10 B are connected via a tubular joint 30. The air outlet 21a4 of the humidifier 10B and the air inlet 21b3 of the humidifier 10C are connected via a joint 31.

  Further, the off-gas outlet 21a2 of the humidifier 10A and the off-gas inlet 21b2 of the humidifier 10B are connected via a joint 40. Further, the off-gas outlet 21c2 of the humidifier 10B and the off-gas inlet 21a5 of the humidifier 10C are connected via a joint 41. The joints 30, 31, 40, and 41 are all formed in an L shape with a hard resin or the like, and are connected to air inlets 21a3 and 21b3, air outlets 21c1, 21a4, and the like through seal members (not shown). The off gas inlets 21b2 and 21a5 and the off gas outlets 21a2 and 21c2 are connected.

  In the present embodiment, the air inlets 21b1, 21a3, 21b3, the air outlets 21c1, 21a4, 21c3, the offgas inlets 21a1, 21b2, 21a5, and the offgas outlets 21a2, 21c2, 21a6 are all formed in a circular tube shape. However, it is not limited to such a shape, and may be a square opening and can be appropriately changed.

  As shown in FIG. 3, in the humidifiers 10A, 10B, and 10C, the hollow fiber membrane bundle 11 is accommodated in the case 21a. In addition, the axial direction (longitudinal direction) of the hollow fiber membrane bundle 11 and the case 21 coincides.

  The hollow fiber membrane bundle 11 is made of polyimide or the like, and a plurality of (for example, several thousand or more) straw-like hollow fiber membranes 12 having moisture permeability are bundled. Further, both front and rear end portions of the hollow fiber membrane bundle 11 are fixed to the inner wall of the case 21a via potting portions 13 and 13 (sealing portions) formed of an epoxy resin or the like. Thereby, between the outer peripheral surface of each hollow fiber membrane 12, and the outer peripheral surface of the hollow fiber membrane 2, and the inner wall surface of case 21a are each obstruct | occluded.

  In the humidification unit 1 configured in this way, as shown in FIG. 3, air from the air compressor 131 (see FIG. 1) passes through the cap 21b from the air inlet 21b1 of the cap 21b of the humidifier 10A. After passing through the inside of the hollow fiber membrane 12 and flowing through each hollow fiber membrane 12 forward, it passes through the cap 21c and flows out from the air outlet port 21c1 of the cap 21c.

  The air that flows out of the humidifier 10A is introduced from the air inlet 21a3 of the case 21a of the humidifier 10B through the joint 30, and conversely, passes through the outside of each hollow fiber membrane 12 and out of each hollow fiber membrane 12. And then flows out from the air outlet 21a4 of the case 21a.

  The air flowing out from the humidifier 10B passes through the inside of the cap 21b from the air inlet 21b3 of the cap 21b of the humidifier 10C through the joint 31 and passes through the inside of each hollow fiber membrane 12 and moves forward in each hollow fiber membrane 12. And then flows out from the air outlet 21c3 of the cap 21c through the cap 21c. The humidified air that flows out from the air outlet 21c3 is supplied to the cathode of the fuel cell stack 110 through the pipe 131b.

  On the other hand, the cathode offgas from the pipe 131c connected to the fuel cell stack 110 passes through the outside of each hollow fiber membrane 12 from the offgas inlet 21a1 of the case 21a of the humidifier 10A, and travels outward from each hollow fiber membrane 12 to the rear. Then, the air flows while facing the air, and then flows out from the off-gas outlet 21a2 of the case 21a.

  The cathode off-gas flowing out of the humidifier 10A passes through the inside of each hollow fiber membrane 12 through the inside of the cap 21b from the off-gas inlet 21b2 of the cap 21b of the humidifier 10B through the joint 40, and passes through the inside of each hollow fiber membrane 12. After flowing forward, the gas flows through the cap 21c and flows out from the off-gas outlet 21c2 of the cap 21c.

  The cathode off-gas flowing out of the humidifier 10B passes through the outside of each hollow fiber membrane 12 from the off-gas inlet 21a5 of the case 21a of the humidifier 10C via the joint 41, and passes outside the hollow fiber membrane 12 to the rear. Then, the gas flows out from the off-gas outlet 21a6 of the case 21a. The cathode offgas flowing out from the offgas outlet 21a6 is discharged to the diluter 132 through the pipe 132a.

  Since each of the hollow fiber membranes 2 has an infinite number of capillaries, the water vapor contained in the cathode offgas (second fluid) introduced outside the hollow fiber membrane 2 in the humidifiers 10A and 10C By condensing in the section and moving to the inside of the hollow fiber membrane 2, moisture is passed to the dried air (first fluid). Further, in the humidifier 10B, the cathode offgas (second fluid) passes inside the hollow fiber membrane 2 and the air (first fluid) passes outside the hollow fiber membrane 2 by the same mechanism as described above. Moisture contained in the off-gas is passed to the air. With such a mechanism, the moisture in the cathode off-gas is supplied to the air in the humidifying unit 1, and the air becomes the humidified gas (humidified air).

  As described above, according to the humidification unit 1 of the present embodiment, the plurality of humidifiers 10A to 10C are stacked in a staircase manner with the positions shifted toward the gas flow direction (front-rear direction) inside the hollow fiber membrane 12. At the same time, the air (first fluid) that has flowed inside the hollow fiber membrane 12 in the humidifier 10A flows further to the outside of the hollow fiber membrane 12 in the humidifier 10B adjacent to the humidifier 10A, and further adjacent to the humidifier 10B. The cathode off-gas (second fluid) that flows inside the hollow fiber membrane 12 in the humidifier 10C that flows to the outside of the hollow fiber membrane 12 in the humidifier 10A is generated in the humidifier 10B adjacent to the humidifier 10A. The humidifier 10C adjacent to the humidifier 10B flows outside the hollow fiber membrane 12 so that it flows inside the hollow fiber membrane 12, so that the position where the air and the cathode off-gas flow can be adjusted. Each by flowing between the inside and the outside of the hollow fiber membranes 12 as Waru alternated, each humidifier 10A~10C can be stacked in close contact with the upper and lower surfaces to each other. In addition, since the humidifiers 10A to 10C are arranged with their positions shifted in the front-rear direction, they do not protrude from the left and right side surfaces of the humidifiers 10A to 10C. Therefore, the vertical dimension (height) and the horizontal dimension (width) of the humidifying unit 1 can be reduced, and the humidifying unit 1 can be formed compactly.

  Furthermore, according to the humidification unit 1 of this embodiment, as shown in FIG. 3, the air outlet 21c1 and the air introduction are connected by connecting the flow from the end face of the humidifier 10A to the lower surface of the adjacent humidifier 10B. The air outlet 21a4 and the air inlet 21b3 can be brought close to each other by connecting the flow from the upper surface of the humidifier 10B to the end surface of the adjacent humidifier 10C. Can be arranged. Similarly, the off-gas outlet 21a2 and the off-gas inlet 21b2 can be arranged close to each other, and the off-gas outlet 21c2 and the off-gas inlet 21a5 can be arranged close to each other. Thereby, the joint 30 can be arranged in the space Q1 having a triangular cross section formed by the surface m1 facing the front of the cap 21c of the humidifier 10A and the lower surface m2 of the case 21a of the humidifier 10B, and the humidifier 10B. The joint 31 can be disposed in the air Q2 having a triangular cross section formed by the upper surface m3 of the case 21a and the surface m4 directed to the rear of the cap 21b of the humidifier 10C. Similarly, the joint 40 can be arranged in a space Q3 having a triangular cross section formed by the upper surface m5 of the case 21a of the humidifier 10A and the surface m6 directed toward the rear of the cap 21b of the humidifier 10B. The joint 41 in the space Q4 having a triangular cross section formed by the surface m7 directed to the front of the cap 21c and the lower surface m8 of the case 21a of the humidifier 10C can be disposed.

  Therefore, since the joints 30, 31, 40, and 41 can be formed with short pipes, the pipes can be reduced in size. Furthermore, in any of the spaces Q1 to Q4, the outlet (inlet) formed in the caps 21b and 21c and the inlet (outlet) formed in the case 21a are connected, so the shapes of the joints 30, 31, 40, and 41 Can be shared, and the number of parts can be reduced. Therefore, according to the present embodiment, it is possible to simplify the joints 30, 31, 40, 41 by downsizing and sharing.

  Moreover, when the humidification unit 1 of this embodiment is applied to the fuel cell system 100, the fuel cell system 100 can be reduced in size. In the present embodiment, the case where the humidifiers 10A to 10C are horizontally stacked behind the fuel cell stack 110 has been described as an example, but the positions of the joints 30 and 41 are on the lower side, and the joint 31 , 40 may be arranged in a state where the axial directions of the humidifiers 10A to 10C are inclined so that the position of 40 is on the upper side or vice versa.

  Next, the humidification unit 50 of another embodiment is demonstrated with reference to FIG. 4 and FIG. 4 is an external perspective view showing a humidifying unit according to another embodiment, and FIG. 5 is a partially omitted sectional view taken along line BB of FIG. In addition, about the structure similar to embodiment shown in FIG. 2 and FIG. 3, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 4, each of the humidifying units 50 has humidifiers 10 </ b> A to 10 </ b> C having the same shape and a case 21 a having a rectangular tube shape, which are stacked adjacent to each other in a staircase shape. 52 are connected. Fastening pieces 51a are formed on the joint 51 on the top, bottom, left and right, respectively, and the fastening pieces 51 are formed on the left and right of the attachment piece 21s formed on the lower portion of the case 21a of the humidifier 10A and the case 21a of the humidifier 10B. The mounting piece 21s is fastened to the mounting piece 21s formed on the upper portion of the case 21a of the humidifier 10C via a bolt 23 and a nut 24 (see FIG. 5). Similarly, the joint 52 is fastened to the humidifiers 10 </ b> A to 10 </ b> C by the fastening pieces 51 a, the attachment pieces 21 s, the bolts 23, and the nuts 24 for the other joint 52. In addition, a fastening location is not limited to 4 locations.

  As shown in FIG. 5, the joint 51 is formed of, for example, a casting, communicates with the air introduction port 21 b 1 and communicates with the inside of each hollow fiber membrane 12 formed on the end surface s 1 of the humidifier 10 A, the humidifier. A space R2 communicating with the inside of each hollow fiber membrane 12 formed in the off-gas outlet 21a2 of 10A and the end face s2 of the humidifier 10B, and each of the air outlet 21a4 of the humidifier 10B and the end face s3 of the humidifier 10C. A space R3 communicating with the inside of the hollow fiber membrane 12 is provided. Although not shown, the air from the air inlet 21b1 does not flow outside the hollow fiber membrane 12 that opens to the end surface s1 of the humidifier 10A, and the offgas from the offgas outlet 21a2 is humidified. The air from the air outlet 21a4 flows to other than the inside of the hollow fiber membrane 12 that opens to the end surface s3 of the humidifier 10C so that it does not flow outside the inside of the hollow fiber membrane 12 that opens to the end surface s2 of the vessel 10B. In order to prevent this, it is appropriately sealed with a sealing member. The joint 52 is similarly formed.

  Thus, according to embodiment shown in FIG.4 and FIG.5, the said caps (21b, 21c) attached to each end surface s1-s3 of each humidifier 10A-10C to the joints 51, 52, and piping are connected. Thus, the role of the joints (30, 31, 40, 41) can be given, and the number of parts can be reduced and the manufacturing process can be simplified.

  In addition, in this embodiment, although the case where the humidifiers 10A to 10C were stacked in the vertical direction was described as an example, the present invention is not limited to this, and the horizontal direction (surface formed in the left-right front-rear direction) is described. You may make it laminate in steps. Thereby, it becomes possible to constitute a thin and compact humidification unit. Further, in the present embodiment, the case where the humidifiers 10B and 10C are shifted forward has been described as an example, but the present invention is not limited to this, and the positions of 10B and 10C may be shifted backward. Alternatively, the position may be shifted leftward or rightward.

  In the present embodiment, the case where the humidifiers 10A to 10C are stacked in three stages has been described as an example. However, the present invention is not limited to this, and may be two stages or four stages or more. May be.

  In the present embodiment, the hollow fiber membrane bundle 11 composed of a plurality of hollow fiber membranes 12 has been described as an example. However, a sheet-like exchange membrane formed into a spiral shape can also be applied.

It is a block diagram which shows an example at the time of applying the humidification unit of this embodiment to a fuel cell system. It is an external appearance perspective view which shows the humidification unit of this embodiment. It is the sectional view on the AA line of FIG. It is an external appearance perspective view which shows the humidification unit of another embodiment. FIG. 5 is a partially omitted cross-sectional view taken along line BB in FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,50 Humidification unit 10A-10C Humidifier 11 Hollow fiber membrane 12 Hollow fiber membrane bundle 13 Potting part 21a Case 21b, 21c Cap 21a1, 21b2, 21a5 Off-gas inlet 21a2, 21c2, 21a6 Off-gas outlet 21b1, 21a3, 21b3 Air Inlet 21c1, 21a4, 21a3 Air outlet 30, 31, 40, 41, 51, 52 Joint Q1-Q4 space

Claims (4)

In a humidifying unit in which a plurality of humidifiers that contain hollow fiber membranes are stacked,
In the one humidifier, the first fluid flows outside the hollow fiber membrane, the second fluid flows inside the hollow fiber membrane,
In the other humidifier adjacent to the one humidifier, the second fluid flows outside the hollow fiber membrane, and the first fluid flows inside the hollow fiber membrane,
Adjacent humidifiers are arranged so as to penetrate both planes perpendicular to the gas flow direction inside the hollow fiber membrane, and are arranged in a shifted position in the gas flow direction inside the hollow fiber membrane. And
A humidifying unit characterized in that a joint that connects an opening communicating with the inside of the hollow fiber membrane and an opening communicating with the outside of the hollow fiber membrane is provided in a space formed by shifting the position.   The humidifying unit according to claim 1, wherein the plurality of humidifiers are adjacent to each other in a stepped manner.   The flow from the end surface of the humidifier is connected to the lower surface or the upper surface of the adjacent humidifier, and the flow from the upper surface or the lower surface of the humidifier is connected to the end surface of the adjacent humidifier. The humidifying unit according to claim 1 or 2.   The humidifying unit according to any one of claims 1 to 3, wherein the joint is fastened to an end face on the same side of the plurality of humidifiers to connect the plurality of humidifiers.

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