CN217933890U - Humidifier suitable for fuel cell - Google Patents

Abstract

The utility model relates to the technical field of fuel cells, and provides a humidifier suitable for fuel cells, including major structure, membrane tube and the guiding gutter that sets up in the major structure, the membrane tube is crooked type structure to dry air is suitable for flowing in the membrane tube, the membrane tube sets up in the guiding gutter, and moisture is suitable for flowing in the guiding gutter, so that the moisture in the guiding gutter permeates into in the membrane tube and humidifies dry air; the flow directions of the wet air and the dry air are opposite, and the flow guide grooves are of a bent structure matched with the membrane tubes, so that the flow guide grooves guide the flow of the wet air to flow along a bent route; the utility model discloses can increase the humidification time of moisture to the dry-air to make the moisture fully humidify the dry-air, improve humidification efficiency.

Description

Humidifier suitable for fuel cell

Technical Field

The utility model relates to a fuel cell technical field particularly, relates to a humidifier suitable for fuel cell.

Background

The proton exchange membrane in the fuel cell can conduct protons only in a state of being wetted by water, so that dry air needs to be humidified by a humidifier during operation of the fuel cell to ensure that the proton exchange membrane can effectively conduct protons. The existing humidifier for fuel cell is usually provided with a chamber in the main structure, so that moisture enters from one end of the chamber and flows out from the other end of the chamber, and dry air circulates in the membrane tube by arranging a plurality of membrane tubes with straight tube type structures in the chamber in an array manner, thereby realizing the purpose that the moisture permeates into the membrane tube to humidify the dry air in the membrane tube.

However, in the structure of the humidifier, the membrane tube of the straight tube structure is adopted, and the length of the membrane tube is short in a specific space, so that the distance of dry air flowing through the membrane tube of the straight tube structure is short, and meanwhile, the distance of moisture flowing through the membrane tube is short because the moisture flows linearly, so that the time of humidifying the dry air by the moisture is short, the dry air is insufficiently humidified by the moisture, and the humidifying effect is affected.

SUMMERY OF THE UTILITY MODEL

The utility model solves the problem of how to increase the humidifying time of the moisture to the dry air, thereby improving the humidifying effect of the humidifier.

In order to solve the above problems, the present invention provides a humidifier for a fuel cell, comprising a main structure, a membrane tube and a guiding groove arranged in the main structure, wherein the membrane tube is of a bending structure, and dry air is suitable for flowing in the membrane tube, the membrane tube is arranged in the guiding groove, and moisture is suitable for flowing in the guiding groove, so that the moisture in the guiding groove permeates into the membrane tube to humidify the dry air; the flow directions of the wet air and the dry air are opposite, and the guide grooves are of a bent structure matched with the film tubes, so that the guide grooves guide the wet air to flow along a bent route.

Optionally, the main body structure includes a housing and an end cover, the end cover is connected to one end of the housing, and a dry gas inlet and a dry gas outlet are oppositely disposed on one side of the end cover away from the housing, and the dry gas inlet and the dry gas outlet are respectively connected to the gas inlet end and the gas outlet end of the membrane tube correspondingly; the opposite two sides of the shell are respectively provided with a moisture inlet and a moisture outlet, the moisture inlet and the moisture outlet are respectively connected with two ends of the diversion trench correspondingly, and the diversion trench is arranged in the shell.

Optionally, the membrane tube is of a U-shaped structure, the diversion trench is correspondingly of a U-shaped structure, and the end cover is connected with one end of the shell close to the diversion trench opening.

Optionally, the membrane tube is of a wave linear structure, the air inlet end and the air outlet end of the membrane tube are in the same direction, the corresponding diversion trench is also of a wave linear structure, and the end cover is connected with one side of the shell, which is close to the air inlet end or the air outlet end of the membrane tube.

Optionally, the number of membrane pipe is a plurality of, and is a plurality of the membrane pipe parallel arrangement is and be arranged the form and distribute, and is a plurality of the inlet end of membrane pipe and the end of giving vent to anger correspond respectively with dry gas import and dry gas outlet connection.

Optionally, the membrane tube is made of a hydrophilic material.

Optionally, a humidifier suitable for fuel cell still includes the gas distribution pipeline that is the trumpet-shaped structure, gas inlet and the gas outlet of gas distribution pipeline respectively correspond with the dry gas import is connected with a plurality of the air inlet of membrane tube for will get into dry gas import is evenly distributed to a plurality of in the membrane tube.

Optionally, the humidifier for fuel cell further includes a fixing device, the fixing device includes fixing rings, two of the fixing rings are respectively sleeved at two ends of the plurality of membrane tubes, and the fixing rings are connected to the housing and are used for fixing the ends of the plurality of membrane tubes to the housing.

Optionally, the fixing device further includes a fixing plate, the fixing plates are distributed in the diversion trench between the two fixing rings at intervals in a zigzag shape, a plurality of fixing holes are formed in the fixing plate, and each fixing hole is correspondingly clamped with each membrane tube.

Optionally, the humidifier suitable for fuel cell still includes the pouring sealant resin layer, the pouring sealant resin layer set up in the guiding gutter is close to the one end of end cover to fill in the gap between membrane tube and the guiding gutter wall, be used for sealing the tip of guiding gutter.

Compared with the prior art, the utility model discloses a set up the guiding gutter in the major structure, so that the moisture that gets into in the major structure is located the guiding gutter, the guiding gutter is used for carrying out the water conservancy diversion to the moisture, the membrane tube sets up in the guiding gutter, and dry air is suitable for and flows in the membrane tube, thereby can make the moisture infiltration in the guiding gutter advance the membrane intraductal humidification to dry air, the flow direction of moisture is opposite with the flow direction of dry air, thereby can make the moisture fully humidify to dry air, the membrane tube sets up to crooked type structure, thereby can make its length be greater than the length of the membrane tube of straight tube type structure in the same distance, thereby can increase the length that dry air flowed through in the membrane tube, the guiding gutter be with membrane tube assorted crooked type structure, thereby can guide the moisture to flow along crooked route, thereby increase the length that the humid air flowed through and make moisture fully contact with membrane tube outer wall, thereby make the time that the moisture carry out the humidification become long to dry air, thereby strengthened the humidification effect to dry air.

Drawings

Fig. 1 is one of the schematic internal structural diagrams of the main structure of the embodiment of the present invention;

fig. 2 is a schematic view of the internal structure of the housing according to the embodiment of the present invention;

fig. 3 is a schematic structural diagram of a fuel cell humidifier according to an embodiment of the present invention;

fig. 4 is a second schematic view of the internal structure of the main body structure according to the embodiment of the present invention;

fig. 5 is a third schematic view of the internal structure of the main body structure according to the embodiment of the present invention.

Description of reference numerals: 1-a body structure; 11-a housing; 12-an end cap; 13-dry gas inlet; 14-a dry gas outlet; 15-moisture inlet; 16-a moisture outlet; 2-a membrane tube; 3-a diversion trench; 4-a gas distribution conduit; 5-a fixing device; 51-a fixed ring; 52-a fixing plate; 6-pouring an adhesive resin layer.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

It should be noted that, in the coordinate system XYZ provided herein, the X-axis forward direction represents the right direction, the X-axis reverse direction represents the left direction, the Y-axis forward direction represents the front direction, the Y-axis reverse direction represents the rear direction, the Z-axis forward direction represents the upper direction, and the Z-axis reverse direction represents the lower direction. Also, it is noted that the terms "first," "second," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the terms "an example," "one example," and "one implementation," etc., mean that a particular feature, structure, material, or characteristic described in connection with the example or implementation is included in at least one example or implementation of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or implementation. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or implementations.

In order to solve the above problem, as shown in fig. 1 and 2, an embodiment of the present invention provides a humidifier for a fuel cell, including a main body structure 1, a membrane tube 2 and a guiding gutter 3 disposed in the main body structure 1, wherein the membrane tube 2 is of a bent structure, and dry air is adapted to flow in the membrane tube 2, the membrane tube 2 is disposed in the guiding gutter 3, and moisture is adapted to flow in the guiding gutter 3, so that the moisture in the guiding gutter 3 permeates into the membrane tube 2 to humidify the dry air; the flow directions of the moisture and the dry air are opposite, and the guide grooves 3 are of a curved structure matched with the film tubes 2, so that the guide grooves 3 guide the moisture to flow along a curved route.

It should be noted that, a diversion trench 3 is arranged in the main structure 1, moisture generated by the fuel cell enters the main structure 1 and then is located in the diversion trench 3, the moisture is guided by the diversion trench 3 to flow according to a predetermined route, the membrane tube 2 is arranged in the diversion trench 3, and dry air is suitable for flowing in the membrane tube 2, the direction of the moisture flowing in the diversion trench 3 is opposite to the direction of the dry air flowing in the membrane tube 2, the moisture can permeate into the membrane tube 2 to humidify the dry air in the process of relative flow of the moisture and the dry air, the membrane tube 2 is of a bent structure, so that the length of the bent structure membrane tube 2 can be larger than that of the straight tube structure membrane tube 2 within the same distance, so as to increase the distance of the dry air flowing in the membrane tube 2, the diversion trench 3 is of a bent structure matched with the membrane tube 2, so as to increase the distance of the moisture flowing in the diversion trench 3, and at the same time of the moisture flowing outside the membrane tube 2, so as to increase the moisture and further improve the effect of the moisture humidification.

In an embodiment of the present invention, as shown in fig. 3, the main body structure 1 includes a housing 11 and an end cover 12, the end cover 12 is connected to one end of the housing 11, and a side of the end cover 12 away from the housing 11 is relatively provided with a dry gas inlet 13 and a dry gas outlet 14, the dry gas inlet 13 and the dry gas outlet 14 are respectively connected to an air inlet end and an air outlet end of the membrane tube 2; the opposite sides of the housing 11 are respectively provided with a moisture inlet 15 and a moisture outlet 16, the moisture inlet 15 and the moisture outlet 16 are respectively connected with two ends of the diversion trench 3, and the diversion trench 3 is arranged in the housing 11.

It should be noted that the moisture inlet 15 and the moisture outlet 16 are respectively disposed at the upper and lower sides of the housing 11, the moisture inlet 15 and the moisture outlet 16 are respectively connected to two ends of the diversion trench 3, and the diversion trench 3 is disposed in the housing 11, so that the moisture generated by the fuel cell enters the diversion trench 3 in the housing 11 through the moisture inlet 15, and flows through the diversion trench 3 to humidify the dry air in the membrane tube 2, and then is discharged from the moisture outlet 16; the end cover 12 is connected with the right end of the shell 11, so that a closed space is formed in the shell 11, and the outflow of moisture in the diversion trench 3 is avoided, the dry gas outlet 14 and the dry gas inlet 13 are respectively arranged at the upper end and the lower end of the right side of the end cover 12, and the dry gas inlet 13 and the dry gas outlet 14 are respectively correspondingly connected with the gas inlet end and the gas outlet end of the membrane tube 2, so that dry air enters the membrane tube 2 from the dry gas inlet 13 and flows out of the dry gas outlet 14 after flowing through the membrane tube 2; because the membrane tube 2 is of a bent structure, the air inlet end and the air outlet end of the membrane tube 2 can be arranged on the same side, so that the dry air inlet 13 and the dry air outlet 14 can be arranged on the same side, and the end cover 12 can be arranged, so that the dry air inlet 13 and the dry air outlet 14 which are arranged on the same side are arranged on the end cover 12, and the volume of the humidifier is reduced.

Wherein, the upper side of the housing 11 refers to the side of the housing 11 in the coordinate system in the positive direction of the Z axis, the lower side of the housing 11 refers to the side of the housing 11 in the negative direction of the Z axis, and the right end of the housing 11 refers to the end of the housing 11 in the positive direction of the X axis; the upper end of the end cap 12 refers to one end of the end cap 12 in the coordinate system in the positive Z-axis direction, and the lower end of the end cap 12 refers to one end of the end cap 12 in the negative Z-axis direction.

In an embodiment of the present invention, as shown in fig. 1 and fig. 2, the membrane tube 2 is a U-shaped structure, correspondingly, the guiding gutter 3 is also a U-shaped structure, and the end cover 12 is connected to the end of the shell 11 close to the opening of the guiding gutter 3.

It should be noted that the membrane tube 2 may be configured as a U-shaped structure, as shown in fig. 1, within the same distance in the X-axis direction in the coordinate system, the distance through which the dry air in the membrane tube 2 of the U-shaped structure flows through is greater than twice the distance through which the dry air in the membrane tube 2 of the straight tube structure flows through, so as to increase the flow time of the dry air in the membrane tube 2, the diversion trench 3 is a U-shaped structure matched with the membrane tube 2, the membrane tube 2 is disposed in the diversion trench 3, and the distance through which the moisture flows through the U-shaped diversion trench 3 is also increased by two times, so as to increase the flow time through which the moisture flows through the diversion trench 3, so as to increase the humidification time of the moisture on the dry air, and to sufficiently humidify the dry air by the moisture, thereby improving the humidification effect; the opening of the membrane tube 2 of U type structure faces the right side to make the inlet end of membrane tube 2 all be located the right side of membrane tube 2 with the end of giving vent to anger, because the inlet end of membrane tube 2 with give vent to anger the end and correspond respectively and be connected with dry gas import 13 and dry gas export 14, thereby make dry gas import 13 and dry gas export 14 all be located the right side, can set up an end cover 12 on the right side of casing 11, with dry gas import 13 and dry gas export 14 and set up on end cover 12, thereby reduce the volume of humidifier.

In an embodiment of the present invention, as shown in fig. 4, the membrane tube 2 is a wave line structure, and the air inlet end of the membrane tube 2 and the air outlet end face towards the same direction, correspondingly the guiding gutter 3 is also a wave line structure, the end cap 12 is close to the shell 11 one side of the air inlet end or the air outlet end of the membrane tube 2 is connected.

It should be noted that the film tube 2 may be configured as a wave-shaped structure, as shown in fig. 4, in the X-axis direction of the coordinate system, since the film tube 2 with the wave-shaped structure may be bent many times, the dry air flowing distance in the film tube 2 is greater than the dry air flowing distance in the film tube 2 with the straight tube structure under the condition of the same length, thereby increasing the flowing time of the dry air in the film tube 2; the diversion trench 3 is a wave line structure matched with the membrane tube 2, so that the distance of the moisture flowing through the diversion trench 3 is also increased, the time of the moisture flowing through is increased, the humidifying time of the moisture to the dry air is increased, the moisture can fully humidify the dry air, and the humidifying effect is improved; the membrane tube 2 of wave line type can be through bending many times to can make the inlet end of membrane tube 2 the same with the orientation of the end of giving vent to anger, the inlet end of membrane tube 2 all is located the same one side of membrane tube 2 with the end of giving vent to anger promptly for example the right side, because the inlet end of membrane tube 2 and the end of giving vent to anger correspond respectively and are connected with dry gas import 13 and dry gas export 14, thereby make dry gas import 13 and dry gas export 14 all be located the right side, can be with setting up an end cover 12 on the right side of casing 11, set up dry gas import 13 and dry gas export 14 on end cover 12, thereby reduce the volume of humidifier.

In an embodiment of the present invention, as shown in fig. 1, the number of the membrane tubes 2 is a plurality of, a plurality of the membrane tubes 2 are arranged in parallel and distributed in rows, and a plurality of the air inlet and the air outlet of the membrane tubes 2 are respectively connected to the dry air inlet 13 and the dry air outlet 14.

It should be noted that, the number of the membrane tubes 2 may be multiple, the air inlet ends of the multiple membrane tubes 2 are all connected with the dry air inlet 13, the air outlet ends of the multiple membrane tubes 2 are all connected with the dry air outlet 14, so that the dry air is dispersed in the multiple membrane tubes 2 to flow, and the moisture is dispersed outside the multiple membrane tubes 2, so that the contact surface between the moisture and the membrane tubes 2 is increased, so that the moisture can more effectively permeate into the membrane tubes 2 to humidify the dry air, and thus the humidifying effect is improved; the plurality of membrane tubes 2 are arranged in parallel with each other, and the plurality of membrane tubes 2 are distributed in a plurality of rows, and the number of each row of membrane tubes 2 is the same and the membrane tubes are arranged at equal intervals, so that the moisture can be uniformly dispersed among the plurality of membrane tubes 2, and the humidifying effect of the moisture on the dry air in each membrane tube 2 is the same.

In one embodiment of the present invention, the membrane tube 2 is made of hydrophilic material.

It should be noted that the membrane tube 2 is made of hydrophilic material, so that moisture can smoothly permeate into the membrane tube 2 to humidify the dry air in the membrane tube 2, and the hydrophilic material may be hydrophilic cotton, hydrophilic fiber, etc.

In an embodiment of the present invention, as shown in fig. 5, a humidifier suitable for fuel cell further includes a gas distribution pipe 4 in a trumpet-shaped structure, the gas inlet and gas outlet of the gas distribution pipe 4 correspond to the dry gas inlet 13 and are multiple respectively the gas inlet end of the membrane tube 2 is connected to evenly distribute the dry gas entering the dry gas inlet 13 into the membrane tube 2.

It should be noted that the gas distribution pipeline 4 is used for uniformly distributing dry air from the dry air inlet 13 to each membrane tube 2, the gas distribution pipeline 4 is in a horn-shaped structure, the gas inlet of the gas distribution pipeline 4 is located at one end with a smaller opening of the horn-shaped structure, the gas outlet of the gas distribution pipeline 4 is located at one end with a larger opening of the horn-shaped structure, the gas inlet of the gas distribution pipeline 4 is connected with the dry air inlet 13, the gas outlet of the gas distribution pipeline 4 is respectively connected with the gas inlet ends of the plurality of membrane tubes 2, the dry air in the dry air inlet 13 enters the gas distribution pipeline 4, and the gas distribution pipeline 4 is in the horn-shaped structure, so that the dry air entering the gas distribution pipeline 4 can be diffused and then uniformly conveyed into each membrane tube 2, so that the dry air is uniformly distributed in each membrane tube 2, and the humidification effect of moisture on the dry air in each membrane tube 2 is the same.

In an embodiment of the present invention, as shown in fig. 5, a humidifier suitable for fuel cell further includes a fixing device 5, the fixing device 5 includes a fixing ring 51, two fixing rings 51 are respectively provided at two ends of the membrane tube 2 corresponding to the sleeves, and the fixing ring 51 is connected to the housing 11, for fixing the ends of the membrane tube 2 to the housing 11.

It should be noted that, the shape of fixed ring 51 matches with the shape after a plurality of membrane tubes 2 are arranged, two fixed ring 51 correspond the cover respectively and locate the inlet end of membrane tubes 2 and the tip at the end of giving vent to anger, thereby fix the end of a plurality of membrane tubes 2 in fixed ring 51, avoid membrane tubes 2 in disorder, fixed ring 51's the outside can be connected with casing 11 through the bolt, thereby be fixed in casing 11 with fixed ring 51 on, and then with the end fixing of a plurality of membrane tubes 2 on casing 11, thereby avoid membrane tubes 2 to rock.

Wherein, evenly be provided with a plurality of air vents on the lateral wall of solid fixed ring 51 to the moisture in the guiding gutter 3 can get into the outside of membrane tube 2 tip through the air vent, thereby makes the moisture carry out the humidification to the dry air in the membrane tube 2 tip, thereby further improves the humidification effect.

In an embodiment of the present invention, as shown in fig. 5, the fixing device 5 further includes a fixing plate 52, a plurality of fixing plates 52 are distributed in the guiding groove 3 between the two fixing rings 51 at intervals in a zigzag manner, a plurality of fixing holes are opened on the fixing plate 52, and each of the fixing holes corresponds to each of the film tubes 2 and is connected to the corresponding fixing hole.

It should be noted that, a plurality of fixing plates 52 are distributed in the guiding gutter 3 between the two fixing rings 51 at intervals, and are used for fixing different parts of the middle part of the membrane tubes 2 arranged in the guiding gutter 3, a plurality of fixing holes are formed in the fixing plates 52, and each fixing hole is correspondingly clamped with each membrane tube 2, so that different parts of the middle part of the membrane tubes 2 are fixed, and after the membrane tubes 2 are fixed by the fixing holes, the distance between each membrane tube 2 can be fixed, so that moisture is uniformly distributed among the membrane tubes 2, and thus, the moisture can uniformly humidify dry air in each membrane tube 2; the fixing plates 52 are distributed in a zigzag shape, so that the moisture in the flow guide grooves can be further guided, and the moisture can flow along zigzag paths among the fixing plates 52, thereby further increasing the flowing distance of the moisture, prolonging the humidifying time of the moisture to the dry air, and improving the humidifying effect.

In an embodiment of the present invention, as shown in fig. 1, a humidifier suitable for fuel cell further includes a pouring sealant layer 6, the pouring sealant layer 6 is disposed on the end of the end cover 12 close to the guiding gutter 3, and is filled in the gap between the membrane tube 2 and the wall of the guiding gutter 3, so as to seal the end of the guiding gutter 3.

It should be noted that, as shown in fig. 1, the potting adhesive resin layer 6 is disposed at the right end of the diversion trench 3, and is used for sealing gaps between the right ends of the membrane tubes 2 and gaps between the membrane tubes 2 and the inner walls of the diversion trench 3, so as to prevent moisture from leaking, and to enable the moisture to better humidify dry air in the membrane tubes 2; the potting adhesive resin layer 6 is a sealing layer formed by filling gaps between the right ends of the membrane tubes 2 and gaps between the membrane tubes 2 and the inner walls of the diversion trenches 3 with potting resin adhesive.

The right end of the membrane tube 2 refers to one end of the membrane tube 2 in the positive direction of the X axis in the coordinate system.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to fall within the scope of the present disclosure.

Claims (10)

1. A humidifier suitable for a fuel cell, comprising a main body structure (1), a membrane tube (2) and a guiding gutter (3) arranged in the main body structure (1), wherein the membrane tube (2) is of a bent type structure, dry air is suitable for flowing in the membrane tube (2), the membrane tube (2) is arranged in the guiding gutter (3), and moisture is suitable for flowing in the guiding gutter (3), so that the moisture in the guiding gutter (3) penetrates into the membrane tube (2) to humidify the dry air; the flow direction of the moisture in the diversion trench (3) is opposite to the flow direction of the dry air in the membrane tube (2), and the diversion trench (3) is of a bent structure matched with the membrane tube (2), so that the diversion trench (3) guides the moisture to flow along a bent route.

2. The humidifier for the fuel cell according to claim 1, wherein the main body structure (1) comprises a housing (11) and an end cover (12), the end cover (12) is connected with one end of the housing (11), and a dry gas inlet (13) and a dry gas outlet (14) are oppositely arranged on one side of the end cover (12) far away from the housing (11), and the dry gas inlet (13) and the dry gas outlet (14) are respectively connected with the gas inlet end and the gas outlet end of the membrane tube (2); the two opposite sides of the shell (11) are respectively provided with a moisture inlet (15) and a moisture outlet (16), the moisture inlet (15) and the moisture outlet (16) are respectively connected with two ends of the diversion trench (3), and the diversion trench (3) is arranged in the shell (11).

3. The humidifier for a fuel cell according to claim 2, wherein the membrane tubes (2) are of a U-shaped configuration, the corresponding channels (3) are also of a U-shaped configuration, and the end cap (12) is connected to the end of the housing (11) near the opening of the channels (3).

4. The humidifier for a fuel cell according to claim 2, wherein the membrane tubes (2) are of a wavy linear structure, the inlet ends and the outlet ends of the membrane tubes (2) are oriented in the same direction, the corresponding guide grooves (3) are also of a wavy linear structure, and the end cover (12) is connected to the side of the housing (11) near the inlet ends or the outlet ends of the membrane tubes (2).

5. The humidifier for fuel cells according to claim 3 or 4, wherein the number of the membrane tubes (2) is plural, a plurality of the membrane tubes (2) are arranged in parallel and distributed in a row, and the air inlet ends and the air outlet ends of the plurality of the membrane tubes (2) are respectively connected to the dry air inlet (13) and the dry air outlet (14) correspondingly.

6. Humidifier for a fuel cell according to claim 5, characterized in that the membrane tubes (2) are made of hydrophilic material.

7. The humidifier for fuel cells according to claim 5, further comprising a gas distribution pipe (4) having a trumpet-shaped structure, wherein the gas inlet and the gas outlet of the gas distribution pipe (4) are respectively connected to the dry gas inlet (13) and the gas inlets of the plurality of membrane tubes (2) for uniformly distributing the dry air entering the dry gas inlet (13) into the plurality of membrane tubes (2).

8. The humidifier for fuel cell according to claim 5, further comprising a fixing device (5), wherein the fixing device (5) comprises fixing rings (51), two fixing rings (51) are respectively sleeved on two ends of the plurality of membrane tubes (2), and the fixing rings (51) are connected to the housing (11) for fixing the ends of the plurality of membrane tubes (2) to the housing (11).

9. The humidifier applicable to the fuel cell according to claim 8, wherein the fixing device (5) further comprises a fixing plate (52), the fixing plates (52) are distributed in the diversion trench (3) between the two fixing rings (51) at intervals in a zigzag manner, a plurality of fixing holes are formed in the fixing plate (52), and each fixing hole is correspondingly clamped with each membrane tube (2).

10. The humidifier for fuel cells according to claim 3, further comprising a pouring sealant layer (6), wherein the pouring sealant layer (6) is disposed at one end of the diversion trench (3) close to the end cap (12), and is filled in a gap between the membrane tube (2) and the wall of the diversion trench (3) for sealing the end of the diversion trench (3).

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