JP2006064189A - Humidifier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a humidifier capable of preventing the fracture of an inner pipe caused by thermal contraction of a hollow fiber membrane even when an inter cooler is eliminated. <P>SOLUTION: A housing 10 is provided with the inner pipe 20 and a connecting member 30 at its center part. Further the housing 10 stores a bundle of hollow fiber membranes 2A at an outer side of the inner pipe 20 and the connecting member 30. When the hollow fiber membranes 2 are thermally contracted by a dry gas of high temperature introduced to the inside of the hollow fiber membrane 2, the inner pipe 20 and the connecting member 30 are slid to each other, and further a first cylindrical body 11 and a second cylindrical body 12 are slid to each other to absorb the thermal contraction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a humidifying device in which a hollow fiber membrane bundle is provided in a housing.

  A fuel cell mounted on a fuel cell vehicle or the like is a membrane electrode in which an anode electrode (hydrogen electrode) containing a catalyst is provided on one side of a solid polymer electrolyte membrane and a cathode electrode (oxygen electrode) containing a catalyst on the other side. The structure (MEA; Membrane Electrode Assembly) has a structure in which a plurality of single cells each provided with a conductive separator on both sides are stacked in the thickness direction. In this fuel cell, when fuel gas (for example, hydrogen gas) is supplied to the anode electrode and oxidant gas (for example, air) is supplied to the cathode electrode, hydrogen ions are generated by the action of the catalyst at the anode electrode. Moves to the cathode electrode through the solid polymer electrolyte membrane. In the anode electrode, electrons are generated when hydrogen ions are generated, and the electrons move to the cathode electrode via an external load. Hydrogen ions and electrons that have moved to the cathode electrode react with oxygen in the air by the action of the catalyst on the cathode electrode to produce water.

Since the solid polymer electrolyte membrane provided in this type of fuel cell has a reduced ionic conductivity and reduced power generation efficiency when the membrane is dried, an air humidifier is used when supplying air to the cathode electrode of the fuel cell. It is used to humidify. As humidifiers for humidifying the air, those described in the following Patent Documents 1 to 5 have been proposed.
JP 2002-147802 (paragraphs 0026 to 0028, FIG. 1) JP 2002-292233 (paragraphs 0015 and 0016, FIG. 1) JP 2002-29883A (paragraph 0014, FIG. 3) Japanese Patent Laying-Open No. 2003-157872 (paragraphs 0015 and 0016, FIG. 1) JP 2002-289228 A (paragraph 0065)

  By the way, in the fuel cell system, when air is sent into the fuel cell, the air is generally compressed by a compressor and sent. In addition, when air is pressurized with a compressor, the air becomes high temperature, and therefore, an intercooler is connected between the compressor and a humidifier to cool the fuel cell to a temperature suitable for power generation. In order to reduce the cost of the fuel cell system, the intercooler is abolished and high-temperature air is supplied as it is to the humidifier, or high-temperature air that is not sufficiently cooled as a simple intercooler is supplied to the humidifier If the high-temperature air that is not cooled due to the malfunction of the intercooler without being abolished is supplied to the humidifier, the hollow fiber membrane provided in the housing is thermally contracted, Due to the heat shrinkage force, the inner pipe may be damaged, and in some cases, the potting portion for maintaining the airtightness in the housing may be peeled off from the cylindrical case or the inner pipe.

  Therefore, as a means for preventing the thermal shrinkage of the hollow fiber membrane, the hollow fiber membrane is annealed (a process for removing the thermal shrinkage of the hollow fiber membrane) before the hollow fiber membrane is incorporated in the housing, and is thermally contracted in advance. It has been proposed to incorporate a hollow fiber membrane in a fresh state (see Patent Document 5). In this case, if the annealing temperature is set too high in order to sufficiently heat-shrink the hollow fiber membrane, the heat shrinkage of the hollow fiber membrane can be reduced, but at the same time, the water vapor permeability coefficient is lowered and the water vapor permeable membrane is reduced. As a result, the air supplied to the fuel cell cannot be sufficiently humidified.

  Therefore, in Patent Document 5, it is proposed to set the temperature of the annealing treatment of the hollow fiber membrane to a low level so as not to impair the function as the water vapor permeable membrane. However, when applied to a fuel cell system or the like not equipped with an intercooler at the set temperature described in Patent Document 5, the heat shrinkage force of the hollow fiber membrane cannot be sufficiently absorbed and the inner pipe contracts during use. It may be damaged or the potting part may peel off.

  In addition, since the humidifiers described in Patent Documents 1, 3, and 4 have a structure in which the inner pipe is supported by the housing at both ends of the hollow fiber membrane, the inner pipe is damaged by the heat shrinkage force of the hollow fiber membrane. May occur. Moreover, since the humidification apparatus of patent document 2 is a structure where the one side of an inner pipe is supported by a housing, although a damage of an inner pipe can be prevented, there exists a possibility that a potting part may peel off.

  The present invention solves the above-described conventional problems, and provides a humidifier that can prevent damage to the inner pipe due to thermal contraction of the hollow fiber membrane even if the intercooler is eliminated. Objective.

  The present invention provides a hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled, a housing that accommodates the hollow fiber membrane bundle, and a first fluid that is provided in the housing and flows outside the hollow fiber membranes. And a humidifier that delivers moisture between the first fluid and the second fluid when the second fluid is passed through the hollow portion inside each hollow fiber membrane. The housing includes a connecting member slidably connected to the inner pipe.

  According to the present invention, when the hollow fiber membrane is thermally contracted, the inner pipe slides in the shrinking direction of the hollow fiber membrane so that the thermal shrinkage that cannot be absorbed by the annealing treatment of the hollow fiber membrane can be absorbed. Become.

  The housing has a first cylinder and a second cylinder divided in the axial direction, and the first cylinder and the second cylinder have at least a length of the housing. A structure that is slidably connected in the shrinking direction may be added.

  Also in this configuration, when the hollow fiber membrane is thermally contracted, the first cylinder and the second cylinder slide with each other in the shrinking direction of the hollow fiber membrane, so that the hollow fiber membrane is absorbed by the annealing treatment. It becomes possible to absorb the heat shrinkage that could not be done.

  In this case, an annular seal member is provided at a position where the outer peripheral surface of the first cylinder and the inner peripheral surface of the second cylinder face each other, and the first seal member corresponding to the seal member is provided. It is preferable that a reinforcing member is provided on the inner peripheral surface of the cylindrical body.

  Thereby, it can prevent that a 1st cylinder deform | transforms with the compressive force to the radial center direction by a sealing member.

  According to the first aspect of the present invention, it can be mounted on a fuel cell system not equipped with an intercooler, or a fuel cell system equipped with an intercooler with a simple mechanism, and moreover, due to thermal contraction of the hollow fiber membrane, Breakage of the inner pipe and peeling of the potting portion can be prevented. According to the second aspect of the present invention, it is possible to more reliably prevent damage to the inner pipe and peeling of the potting portion. According to invention of Claim 3, it can prevent that the sealing performance of the connection part of a 1st cylinder and a 2nd cylinder is impaired.

  1 is a cross-sectional view showing a humidifying device of the present embodiment, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, FIG. 3 is a cross-sectional view taken along the line BB in FIG. C sectional view, FIG. 5 is an overall configuration diagram showing an example of a fuel cell system, FIG. 6 is an operation explanatory view of the hollow fiber membrane, (a) before operation, and (b) after operation. In FIG. 1, for convenience of explanation, the interval between the hollow fiber membranes is shown wider than the actual distance.

  As shown in FIG. 1, the humidifier 1 includes a housing 10 in which a hollow fiber membrane bundle 2 </ b> A obtained by bundling a plurality of hollow fiber membranes 2 is accommodated, an inner pipe 20, and a connecting member 30.

  The housing 10 includes a first cylindrical body 11 and a second cylindrical body 12 formed of synthetic resin or the like, and the first cylindrical body 11 is located inside and the second cylindrical body 12 at the center. Are slidably connected in the axial direction so as to be located outside. Specifically, step portions are formed at the distal end portion 11a of the first cylindrical body 11 and the distal end portion 12a of the second cylindrical body 12, respectively, and the inner peripheral surface 11b of the first cylindrical body 11 is Both are connected so that the internal peripheral surface 12b of the 2nd cylinder 12 may become a substantially identical surface mutually.

  A concave portion 12c is formed on the inner peripheral surface 12b of the distal end portion 12a of the second cylindrical body 12 along the circumferential direction, and an O (o) ring 13 (FIG. 5) functions as an annular seal member in the concave portion 12c. 2). By providing this O-ring 13, the sealing performance of the connecting sliding portion between the tip portion 11 a of the first cylinder 11 and the tip portion 12 a of the second cylinder 12 is ensured. Further, as shown in FIG. 4, a plurality (eight in this embodiment) of opening portions 12d are formed in the circumferential surface on the proximal end side of the second cylindrical body 12 along the circumferential direction. Note that the shape and number of the openings 12d can be changed as appropriate.

  A concave portion 11c having a predetermined width along the circumferential direction is formed on the inner peripheral surface 11b of the distal end portion 11a of the first cylindrical body 11, and a plate material such as metal is ring-shaped in the concave portion 11c. The reinforcing member 14 formed in (see FIG. 2) is fitted. The reinforcing member 14 is further provided at a position corresponding to the O-ring 13 so that the surface thereof is flush with the inner peripheral surface 11 b of the first cylindrical body 11.

  As shown in FIG. 1, the inner pipe 20 has a tube shape having openings 20a and 20b at both ends, and a plurality of through holes 20c are formed in a mesh shape on the peripheral surface (see FIGS. 1 and 3). . In addition, the inner pipe 20 is formed with a dimension sufficiently shorter than the dimension in the longitudinal direction (axial direction) of the housing 10, and is installed at the central portion in the housing 10 so as to extend in the axial direction from one end side.

  As shown in FIGS. 1 and 2, the connecting member 30 is installed at the center of the housing 10 so as to extend from the other end opposite to the inner pipe 20. Further, the connecting member 30 is formed so as to have the same diameter as the inner pipe 20 from the base end portion toward the tip portion, and a connecting portion 31 to be inserted into the pipe of the inner pipe 20 is formed at the distal end. . The connecting portion 31 has a conical shape with a tapered tip, which facilitates insertion of the connecting member 30 into the opening 20b of the inner pipe 20 during assembly, and fluid is introduced from the opening 20a side of the inner pipe 20. When this is done, it becomes easy to direct this fluid toward the through hole 20c, and the flow of the fluid can be made smooth.

  The inner pipe 20 and the connecting member 30 are each formed of the same type of synthetic resin material.

  As shown in FIG. 1, a hollow fiber membrane bundle 2 </ b> A in which a plurality of hollow fiber membranes 2 are bundled is formed in an annular space between the inside of the housing 10 and the outer peripheral side of the inner pipe 20 and the outer peripheral side of the connecting member 30. Is housed in. Further, potting portions 15 and 16 that are bonded to the hollow fiber membranes 2 or the housing 10 by an adhesive are provided at both ends of the hollow fiber membrane bundle 2A. Between the outer peripheral surface of the yarn membrane 2 and the inner peripheral surface of the housing 10, between the outer peripheral surface of the hollow fiber membrane 2 and the outer peripheral surface of the end of the inner pipe 20, between the outer peripheral surface of the hollow fiber membrane 2 and the connecting member 30. The space between the outer peripheral surface of the end portions is closed.

  As shown in FIG. 5, the humidifier 1 of the present embodiment can be applied to a fuel cell system 40 such as an automobile. The fuel cell system 40 includes a fuel cell FC, an air supply device 41, a hydrogen supply device 42, and the like.

  The fuel cell FC is a solid polymer type fuel cell, and in the same manner as described in the background art, an anode electrode (hydrogen electrode) p1 including a catalyst on one surface side of the solid polymer electrolyte membrane m, the other surface side. A plurality of unit cells are stacked in the thickness direction, sandwiching both sides of a membrane electrode structure (MEA) having a cathode electrode (oxygen electrode) p2 containing a catalyst on it and sandwiched by conductive separators (not shown). Have a structure.

  The air supply device 41 has a configuration in which the intercooler is eliminated, and includes the humidifying device 1 and a supercharger (S / C) 43. The supercharger 43 is a mechanical supercharger that sucks and pressurizes atmospheric air. The pressurized air is humidified by the humidifier 1 and supplied to the cathode electrode p2 of the fuel cell FC.

  The hydrogen supply device 42 supplies hydrogen as fuel gas to the anode electrode p1 of the fuel cell FC. An ejector 44 is provided between the hydrogen supply device 42 and the fuel cell FC, and the hydrogen supplied from the hydrogen supply device 42 by the ejector 44 is recirculated for use. Thereby, waste of fuel consumption can be omitted.

  In the fuel cell system 40 configured as described above, when hydrogen is supplied to the anode electrode p1 and air (oxygen) is supplied to the cathode electrode p2, it becomes possible to generate electric power and to extract electric power generation current. The extracted generated current is supplied to a load 45 such as a travel motor or a motor of a compressor (supercharger) 43. Further, at the cathode p2 of the fuel cell FC, water is generated by the reaction of oxygen, hydrogen ions that have moved through the solid polymer electrolyte membrane m, and electrons that have passed through the load 45 by the action of the catalyst. . The produced water at this time is discharged as off gas (wet gas) from the fuel cell FC together with unreacted air. This off-gas is sent to the humidifier 1 and is pressurized by the supercharger 43, and moisture is transferred to and from the dry gas (air). The gas humidified by receiving moisture is sent to the cathode electrode p2 of the fuel cell FC. The off gas discharged from the humidifier 1 is discharged out of the system.

  Next, the effect | action in the humidification apparatus 1 is explained in full detail. Here, the first fluid is off-gas (wet gas) fa discharged from the fuel cell FC (see FIG. 5), and the second fluid is dry air supplied via the supercharger 43 (see FIG. 5). This will be described as (dry gas) fb.

  As shown in FIG. 1, the off-gas fa is introduced into the inner pipe 20 from the right end of the housing 10, and is sent to the outside of each hollow fiber membrane 2 through the plurality of through holes 20c. Further, the off gas fa flows between the hollow fiber membranes 2 from the right side to the left side in the figure, and is discharged from the opening 12 d formed in the second cylindrical body 12 to the outside of the housing 10. On the other hand, the dry gas fb is introduced from the left end of the housing 10 so as to pass through the hollow portion inside each hollow fiber membrane 2, flows from the left side to the right side in the hollow fiber membrane 2, Discharged. Since each of the hollow fiber membranes 2 has an infinite number of capillaries, water vapor contained in the off-gas fa introduced outside the hollow fiber membrane 2 is condensed inside the capillaries and moves to the inside of the hollow fiber membrane 2. By doing so, moisture is delivered to the dry gas fb. With such a mechanism, the moisture in the off-gas fa is supplied to the dry gas fb in the humidifier 1, and the dry gas fb is discharged as humidified gas (humidified air).

  By the way, since the hollow fiber membrane 2 has a characteristic of being thermally contracted when heated, it needs to be annealed before being housed in the housing 10. If the annealing temperature is set too high, the water vapor transmission coefficient decreases and the humidification performance is impaired. Therefore, the annealing treatment is performed in a state where the treatment temperature is set low enough that the humidification performance is not impaired. However, the annealing treatment at this temperature alone cannot completely prevent the thermal shrinkage of the hollow fiber membrane 2 in use, which may cause the inner pipe 20 to be damaged due to thermal shrinkage during use. there were.

  Therefore, in the present embodiment, the inner pipe 20 and the connecting member 30 are connected to each other so that the first cylinder 11 and the second cylinder 12 of the housing 10 are slidably connected. In this case, considering the heat shrinkage of the hollow fiber membrane 2, a predetermined clearance CL1 is set between the inner pipe 20 and the connecting member 30 as shown in FIG. A predetermined clearance CL2 is set between the cylinder 11 and the second cylinder 12. The clearance CL1 and the clearance CL2 are set to the same size, for example, and are determined based on the thermal contraction rate of the hollow fiber membrane 2.

  As shown in FIG. 6 (b), the dry gas fb having a temperature higher than that of the annealing treatment is introduced inside each hollow fiber membrane 2 provided in the humidifier 1, and each hollow fiber membrane 2 is indicated by a broken line. When the heat shrinks from the state to the state indicated by the solid line, the inner pipe 20 and the connecting member 30 are further slid and moved so that the first cylinder 11 and the second cylinder 12 approach each other. As a result, the stress acting on the inner pipe 20 due to the thermal contraction of the hollow fiber membrane 2 can be absorbed, the inner pipe 20 is damaged, and the potting portion 15 (see FIG. 1) is It is possible to prevent the potting portion 16 (see FIG. 1) from being peeled off from the one cylindrical body 11 and from the connecting member 30 and the second cylindrical body 12, respectively.

  Further, because the housing 10 has a slide structure, an O-ring 13 is provided to ensure the sealing performance of the connecting portion between the first cylinder 11 and the second cylinder 12. However, if the first cylindrical body is not reinforced when the O-ring 13 is provided, the compressive force F in the radial center direction is applied to the distal end portion 11a of the first cylindrical body 11 as shown in FIG. In order to act, the front-end | tip part 11a of the 1st cylinder 11 deform | transforms, Between the outer peripheral surface of the front-end | tip part 11a of the 1st cylinder 11, and the inner peripheral surface of the front-end | tip part 12a of the 2nd cylinder 12 A gap 17 is generated, and the off gas fa introduced to the outside of the hollow fiber membrane 2 through the gap 17 may leak out of the housing 10.

  Therefore, in the humidifying device 1 of the present embodiment, by providing the ring-shaped reinforcing member 14 at a position corresponding to the O-ring 13 at the distal end portion 11a of the first cylindrical body 11 located inside the O-ring 13, It is possible to prevent a decrease in sealing performance due to the deformation of the first cylinder 11. Further, as shown in FIG. 1, the reinforcing member 14 is fitted into the first cylindrical body 11 so that the surface of the reinforcing member 14 and the inner peripheral surface 11 b of the first cylindrical body 11 are substantially flush with each other. In addition, it is possible to prevent the off-gas fa from being disturbed and to efficiently flow the off-gas fa.

  Next, a modified example of the slide structure of the inner pipe 20 and the connecting member 30 will be described. 8 to 12 show first to fifth modifications, respectively. In addition, the basic shapes of the inner pipe 20 and the connecting members 30A to 30D in the modified examples in FIGS.

  In the first modification shown in FIG. 8A, a plurality of convex guide portions 31 a are formed on the peripheral surface of the connecting portion 31 of the connecting member 30 </ b> A, and the concave guide groove 20 d is formed on the inner peripheral surface of the inner pipe 20. Are formed. As shown in FIG. 8B, the guide portions 31a are formed to protrude at 90 ° intervals, and the guide grooves 20d are formed at 90 ° intervals at positions corresponding to the guide portions 31a. In this modification, the inner pipe 20 and the connecting member 30A are slidable in a direction approaching each other while the respective guide portions 31a are guided in the respective guide grooves 20d.

  In the second modification shown in FIG. 9A, an annular guide recess 32 (see FIG. 9B) into which the end of the inner pipe 20 is inserted is formed at the tip of the connecting member 30B. . In this modification, the inner pipe 20 and the connecting member 30 </ b> B are slidable in a direction in which the inner pipe 20 and the connecting member 30 </ b> B approach each other while being guided by the guide recess 32.

  In the third modified example shown in FIG. 10, a taper 33 that increases in diameter toward the base end side is formed on the peripheral surface of the connecting portion 31 formed at the distal end of the connecting member 30 </ b> C. By forming the taper 33 in this way, when the connecting portion 31 of the connecting member 30C slides in the inner pipe 20, the connecting portion 31 is press-fitted into the inner pipe 20, and the inner pipe 20 and the connecting member 30C are connected. It is designed to prevent gaps between them.

  In the fourth modification shown in FIG. 11A, an O-ring 34 (see FIG. 11B) is interposed on the peripheral surface of the connecting portion 31 of the connecting member 30D. By providing the O-ring 34 in this way, the sliding operation between the inner pipe 20 and the connecting member 30D can be performed smoothly. That is, it is possible to prevent the slide mechanism from working due to the galling of the resin between the inner pipe 20 and the connecting member 30D.

  Moreover, in each modification mentioned above, although the structure where the both ends of the inner pipe 20 were open | released was demonstrated, it is not limited to such a shape. For example, as shown in FIG. 12, one side of the inner pipe 20A is closed, a conical protrusion 21 is provided at the inner end, and the inner pipe 20A is slidably guided to the tip of the connecting member 30E. The guide recess 35 may be provided. Thus, by closing one side of the inner pipe 20A, the off-gas (first fluid) introduced into the inner pipe 20A can be reliably discharged from the through hole 20c formed in the inner pipe 20A. The (first fluid) is efficiently introduced to the outside of each hollow fiber membrane 2 (see FIG. 1).

  As described above, the humidifying device 1 of the present embodiment can be applied to the fuel cell system 40 that is not equipped with an intercooler, so that the cost of the fuel cell system 40 can be reduced. However, it is not always necessary to install the intercooler in the fuel cell system 40. In order to reduce the cost, the air is not sufficiently cooled in the humidifier 1 by installing it in a fuel cell system equipped with a simple intercooler. You may make it introduce. Further, a fuel cell system equipped with an intercooler may be configured to be a humidifier 1 that does not cause a malfunction even if air that is not cooled due to a malfunction in the intercooler is introduced into the humidifier 1.

  In addition, this invention is not limited to above-described embodiment, In the range which does not deviate from the main point of this invention, it can change variously. For example, the first fluid fa passing through the outside of the hollow fiber membrane 2 may be a dry gas, and the second fluid fb passing through the inside of the hollow fiber membrane 2 may be an off gas. The direction in which the second fluid fb flows has been described by taking as an example the case where the second fluid fb flows from the opening 20a of the inner pipe 20 toward the opening 12d of the housing 10, but the second fluid fb flows from the opening 12d of the housing 10. It may be set to be introduced and discharged from the opening 20 a of the inner pipe 20. Further, the slide mechanism may be provided only between the inner pipe 20 and the connecting member 30. The inner pipe 20 and the connecting member 30 may be slidable in the extending direction of the first cylinder 11 and the second cylinder 12.

It is sectional drawing which shows the humidification apparatus of this embodiment. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is a whole lineblock diagram showing an example of a fuel cell system. It is operation | movement explanatory drawing of a hollow fiber membrane, (a) is before operation | movement, (b) is after operation | movement. It is an effect | action figure for demonstrating the malfunction which arises when the reinforcement member is not provided. (A) is an exploded view which shows the 1st modification of the sliding mechanism of an inner pipe and a connection member, (b) is DD sectional drawing. (A) is an exploded view which shows the 2nd modification of the sliding mechanism of an inner pipe and a connection member, (b) is EE sectional drawing. It is an exploded view which shows the 3rd modification of the slide mechanism of an inner pipe and a connection member. (A) is an exploded view which shows the 4th modification of the sliding mechanism of an inner pipe and a connection member, (b) is FF sectional drawing. It is an exploded view which shows the 5th modification of the slide mechanism of an inner pipe and a connection member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Humidifier 2 Hollow fiber membrane 2A Hollow fiber membrane bundle 10 Housing 11 1st cylinder 11a Tip part 11b Inner peripheral surface 12 2nd cylinder 12a Tip part 12b Inner peripheral surface 12d Opening part 13 O-ring (seal member)
DESCRIPTION OF SYMBOLS 14 Reinforcement member 15,16 Potting part 20 Inner pipe 20a, 20b Opening 30 Connection member 31 Connection part 40 Fuel cell system 41 Air supply apparatus 42 Hydrogen supply apparatus 43 Supercharger fa Off gas (1st fluid)
fb Drying gas (second fluid)
FC Fuel cell CL1, CL2 Clearance

Claims (3)

A hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled, a housing that accommodates the hollow fiber membrane bundle, an inner pipe that is provided in the housing and allows a first fluid to flow outside the hollow fiber membranes. In a humidifying device that delivers moisture between the first fluid and the second fluid when the second fluid is passed through the hollow portion inside each hollow fiber membrane,
A humidifying device, wherein a connecting member slidably connected to the inner pipe is provided in the housing.   The housing has a first cylindrical body and a second cylindrical body that are divided in the axial direction, and the first cylindrical body and the second cylindrical body contract at least in a length of the housing. The humidifying device according to claim 1, wherein the humidifying device is slidably connected to the device.   An annular seal member is provided at a position where the outer peripheral surface of the first cylinder and the inner peripheral surface of the second cylinder face each other, and the inner periphery of the first cylinder corresponding to the seal member The humidifying device according to claim 2, wherein a reinforcing member is provided on the surface.

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