FUEL CELL HUMIDIFIER AND PACKING MEMBER FOR SAME

Abstract

Disclosed are: a fuel cell humidifier, which can be manufactured at improved productivity and can significantly reduce maintenance and repair costs; and a packing member for same. The fuel cell humidifier of the present invention comprises: a humidification module for humidifying, with the moisture in exhaust gas discharged from a fuel cell stack, the air supplied from the outside; and a cap coupled to one end of the humidification module, wherein the humidification module includes a middle case and at least one cartridge, which is arranged inside the middle case and includes a plurality of hollow-fiber membranes, and the fuel cell humidifier further includes the packing member coupled to one end of the humidification module in an airtight manner through a mechanical assembly so that fluid-communication can be performed between the cap and only the hollow-fiber membranes.

Claims

1. A humidifier for a fuel cell, the humidifier comprising: a humidification module configured to humidify air supplied from outside using moisture in off-gas discharged from a fuel cell stack; and a cap coupled to one end of the humidification module, wherein the humidification module comprises: a middle case; and at least one cartridge disposed in the middle case, the cartridge comprising a plurality of hollow fiber membranes, and the humidifier further comprises a packing member airtightly coupled to one end of the humidification module through a mechanical assembly method such that the cap fluidly communicates only with the hollow fiber membranes.

2. The humidifier according to claim 1, wherein the packing member comprises: a packing portion having a hole into which an end of the cartridge is inserted, the packing portion being interposed between the middle case and the cartridge; and an edge portion surrounding the packing portion.

3. The humidifier according to claim 2, wherein the packing portion comprises: a main body; and a wing portion surrounding the hole and clinging to the end of the cartridge inserted into the hole.

4. The humidifier according to claim 3, wherein the wing portion is inclined relative to the main body at a predetermined angle such that the packing portion has a first groove between the main body and the wing portion.

5. The humidifier according to claim 4, wherein the packing portion has a first surface facing the cap and a second surface opposite thereto, and the first groove is formed on the first surface.

6. The humidifier according to claim 3, wherein the wing portion projects from the main body toward a center of the hole.

7. The humidifier according to claim 3, wherein the wing portion comprises first and second sub-wing portions arranged side by side in a central axial direction of the hole.

8. The humidifier according to claim 7, wherein each of the first and second sub-wing portions projects from the main body toward a center of the hole.

9. The humidifier according to claim 7, wherein one of the first and second sub-wing portions projects from the main body toward a center of the hole, and the other of the first and second sub-wing portions is inclined relative to the main body at a predetermined angle.

10. The humidifier according to claim 3, wherein each of the hole and the wing portion has a shape corresponding to a shape of the end of the cartridge inserted into the hole.

11. The humidifier according to claim 3, wherein the edge portion has a second groove into which at least a portion of an end of the middle case is inserted.

12. The humidifier according to claim 11, wherein the main body has a first surface facing the cap and a second surface opposite thereto, and the main body has a third groove formed on at least one of the first and second surfaces.

13. The humidifier according to claim 3, wherein each of the packing portion and the edge portion has first hardness of 10 to 100 Shore A, and the packing member further comprises a reinforcement member inserted into at least a portion of the main body, the reinforcement member having second hardness higher than the first hardness.

14. The humidifier according to claim 3, wherein the humidification module comprises two or more cartridges, the packing portion has two or more holes into which the cartridges are inserted, respectively, the packing portion comprises two or more wing portions respectively surrounding the holes, and the main body comprises: a peripheral portion; and at least one rib between the holes.

15. The humidifier according to claim 14, wherein the packing member has a first surface facing the cap and a second surface opposite thereto, the edge portion has a second groove into which at least a portion of an end of the middle case is inserted, the second groove being formed on the second surface, and the rib has a third groove formed on at least one of the first and second surfaces.

16. The humidifier according to claim 14, wherein each of the packing portion and the edge portion has first hardness of 10 to 100 Shore A, and the packing member further comprises a reinforcement member inserted into at least a portion of the main body, the reinforcement member having second hardness higher than the first hardness.

17. The humidifier according to claim 16, wherein the reinforcement member is inserted into the rib.

18. The humidifier according to claim 3, wherein the cartridge further comprises: an inner case having an opening at an end thereof, the plurality of hollow fiber membranes being disposed in the inner case; and a fixing layer in which ends of the plurality of hollow fiber membranes are potted, the fixing layer closing the opening of the inner case.

19. The humidifier according to claim 18, wherein at least a portion of the fixing layer is located outside the inner case, and the wing portion is in tight contact with the fixing layer.

20. The humidifier according to claim 18, wherein an entirety of the fixing layer is located inside the inner case, and the wing portion is in tight contact with the inner case.

21-33. (canceled)

Description

BRIEF DESCRIPTION OF DRAWINGS

[0060] The accompanying drawings, which are included to assist in understanding of the present disclosure and are incorporated in and constitute a part of the present specification, illustrate embodiments of the present disclosure and serve to explain the principle of the present disclosure together with the detailed description of the present disclosure.

[0061] FIG. 1 is an exploded perspective view schematically showing a conventional humidifier for a fuel cell.

[0062] FIGS. 2(a) to 2(c) are an exploded perspective view, an exploded sectional view, and a sectional view schematically showing a humidifier for a fuel cell according to a first embodiment of the present disclosure including a packing member according to a first embodiment of the present disclosure, respectively.

[0063] FIGS. 3(a) and 3(b) show various methods of coupling between the packing member and a middle case.

[0064] FIG. 4 is a sectional view schematically showing a humidifier for a fuel cell according to a second embodiment of the present disclosure including the packing member according to the first embodiment of the present disclosure.

[0065] FIG. 5 is a sectional view schematically showing a humidifier for a fuel cell according to a third embodiment of the present disclosure including the packing member according to the first embodiment of the present disclosure.

[0066] FIGS. 6(a) to 6(c) are an exploded perspective view, an exploded sectional view, and a sectional view schematically showing a humidifier for a fuel cell according to a fourth embodiment of the present disclosure including a packing member according to a second embodiment of the present disclosure, respectively.

[0067] FIG. 7 is a sectional view schematically showing a humidifier for a fuel cell according to a fifth embodiment of the present disclosure including the packing member according to the second embodiment of the present disclosure.

[0068] FIGS. 8(a) and 8(b) are sectional views schematically showing packing members according to third and fourth embodiments of the present disclosure, respectively.

[0069] FIGS. 9(a) and 9(b) are sectional views schematically showing packing members according to fifth and sixth embodiments of the present disclosure, respectively.

[0070] FIGS. 10(a) and 10(b) are sectional views schematically showing packing members according to seventh and eighth embodiments of the present disclosure, respectively.

[0071] FIGS. 11(a) and 11(b) are sectional views schematically showing packing members according to ninth and tenth embodiments of the present disclosure, respectively.

[0072] FIGS. 12(a) and 12(b) are sectional views schematically showing packing members according to eleventh and twelfth embodiments of the present disclosure, respectively.

DETAILED DESCRIPTION OF INVENTION

[0073] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. However, the following embodiments are illustratively provided merely for clear understanding of the present disclosure and do not limit the scope of the present disclosure.

[0074] FIGS. 2(a) to 2(c) are an exploded perspective view, an exploded sectional view, and a sectional view schematically showing a humidifier for a fuel cell according to a first embodiment of the present disclosure including a packing member according to a first embodiment of the present disclosure, respectively.

[0075] As illustrated in FIGS. 2(a) to 2(c), the humidifier 200 for a fuel cell according to the present disclosure includes a humidification module 210 configured to humidify air supplied from the outside using moisture in off-gas discharged from a fuel cell stack. Opposite ends of the humidification module 210 are coupled to caps 220, respectively.

[0076] One of the caps 220 transmits air supplied from the outside to the humidification module 210, and the other cap transmits air humidified by the humidification module 210 to the fuel cell stack.

[0077] The humidification module 210, in which moisture exchange is performed between air supplied from the outside and off-gas, includes a middle case 211 having an off-gas inlet 211a and an off-gas outlet 211b and at least one cartridge 212 disposed in the middle case 211.

[0078] Each of the middle case 211 and the caps 220 according to the present disclosure may be made of hard plastic (e.g. polycarbonate) or metal, and may have a circular or polygonal section in a lateral direction. The circle includes an oval, and the polygon includes a polygon having rounded corners.

[0079] The cartridge 212 may include a plurality of hollow fiber membranes 212a and a fixing layer 212b configured to fix the hollow fiber membranes. For example, the ends of the hollow fiber membranes 212a may be potted in the fixing layer 212b.

[0080] Each of the hollow fiber membranes 212a may include a polymer membrane made of polysulfone resin, polyethersulfone resin, sulfonated polysulfone resin, polyvinylidene fluoride (PVDF) resin, polyacrylonitrile (PAN) resin, polyimide resin, polyamide imide resin, polyester imide resin, or a mixture of two or more thereof, and the fixing layer 212b may be formed by hardening liquid resin, such as liquid polyurethane resin, using a casting method, such as dip potting or centrifugal potting.

[0081] Air supplied from the outside flows along lumens of the hollow fiber membranes 212a. Off-gas introduced into the middle case 211 through the off-gas inlet 211a comes into contact with the outer surfaces of the hollow fiber membranes 212a, and is discharged from the middle case 211 through the off-gas outlet 211b. When the off-gas comes into contact with the outer surfaces of the hollow fiber membranes 212a, moisture contained in the off-gas is transmitted through the hollow fiber membranes 212a to humidify air flowing along the lumens of the hollow fiber membranes 212a.

[0082] As previously described, the caps 220 must fluidly communicate only with the lumens of the hollow fiber membranes 212a in a state of being completely isolated from an inner space S of the middle case 211. If not, air leakage due to pressure difference occurs, whereby the amount of humidified air supplied to the fuel cell stack is reduced, and therefore power generation efficiency of a fuel cell is reduced.

[0083] Consequently, the humidifier 200 for a fuel cell according to the present disclosure further includes a packing member 230 airtightly coupled to each end of the humidification module 210 through a mechanical assembly method.

[0084] Since air leakage between the middle case 211 and each cap 220 is prevented through mechanical assembly of the packing member 230 according to the present disclosure, a conventional casting process (i.e. a process of injecting a liquid resin into a mold and hardening the liquid resin) and an additional sealing process (i.e. a process of applying and hardening a sealant) may be omitted. According to the present disclosure, therefore, production time of the humidifier 200 for a fuel cell is reduced while air leakage between the middle case 211 and each cap 220 is prevented, whereby it is possible to remarkably improve productivity thereof.

[0085] In addition, since the packing member 230 according to the present disclosure configured to prevent air leakage between the middle case 211 and each cap 220 is coupled to the humidification module 210 through a mechanical assembly method, when a problem occurs at a certain part (e.g., the cartridge 212) of the humidification module 210, it is possible to mechanically and thus easily separate the packing member 230 therefrom and repair or replace only the problematic part. According to the present disclosure, therefore, it is possible considerably reduce maintenance expenses of the humidifier 200 for a fuel cell.

[0086] The packing member 230 according to the present disclosure includes a packing portion 231 and an edge portion 232 surrounding the packing portion. The packing member 230 according to the present disclosure, i.e. the packing portion 231 and the edge portion 232, may be made of an elastic material having a hardness of 10 to 100 Shore A, preferably 30 to 70 Shore A, more preferably 40 to 60 Shore A (e.g. silicone or rubber).

[0087] The packing portion 231 has a hole H into which the end of the cartridge 212 (the fixing layer 212b in this embodiment) can be inserted, and is configured to be interposed between the middle case 211 and the cartridge 212.

[0088] The packing portion 231 includes a main body 231a and a wing portion 231b surrounding the hole H and clinging to the end of the cartridge 212 inserted into the hole H.

[0089] According to an embodiment of the present disclosure, as illustrated in FIG. 2(b), the wing portion 231b may be inclined relative to the main body 231a at a predetermined angle such that the packing portion 231 has a first groove G1 between the main body 231a and the wing portion 231b.

[0090] FIG. 2(b) illustrates the packing portion 231 configured such that one end of the wing portion 231b is connected to one end of the main body 231a; however, the present disclosure is not limited thereto. One end of the wing portion 231b may be connected to any portion of the main body 231.

[0091] The first groove G1 may be formed on any one of a first surface of the packing portion 231 that faces the cap 220 and a second surface of the packing portion, which is opposite to the first surface. However, it may be preferable for the first groove G1 to be formed on the first surface in consideration of assembly convenience. Also, when a humidifier has a structure in which humid off-gas flows outside the hollow fiber membranes 212a and air supplied from the outside flows along the lumens of the hollow fiber membranes 212a (i.e., when the internal pressure of the cap 220 is generally higher than the internal pressure of the middle case 211), only the first groove G1 formed on the first surface can allow the wing portion 231b to be pressurized and come into tight contact with the end of the cartridge 212 such that air leakage can be definitely avoided. By contrast, when a humidifier has a structure in which air supplied from the outside flows outside the hollow fiber membranes 212a and humid off-gas flows along the lumens of the hollow fiber membranes 212a (i.e., when the internal pressure of the middle case 211 is generally higher than the internal pressure of the cap 220), it may be desirable that the first groove G1 be formed on the second surface, since only the first groove G1 formed on the second surface can allow the wing portion 231b to be pressurized and come into tight contact with the end of the cartridge 212.

[0092] In addition, since the wing portion 231b is inclined relative to the main body 231a at a predetermined angle (i.e. the wing portion is inclined toward the center of the hole H) before the packing member 230 according to the present disclosure is assembled to the humidification module 210, as illustrated in FIG. 2(b), the wing portion 231b may come into tighter contact with the end of the cartridge 212 when the end of the cartridge 212 is inserted into the hole H.

[0093] Before the packing member 230 according to the present disclosure is assembled to the humidification module 210, the angle θ between the wing portion 231b and the main body 231a in the first groove G1 may be 5° or more and less than 90°, preferably 10° to 75°, more preferably 15° to 60°. When the end of the cartridge 2121 is inserted into the hole H, the wing portion 231b, which is made of an elastic material, may be pushed, whereby the angle θ may be reduced, and the wing portion 231b may come into tighter contact with the end of the cartridge 212 due to elastic force thereof.

[0094] Since the wing portion 231b according to the present disclosure is elastic, the wing portion may perform a vibration absorption function, and therefore it is possible to prevent damage to the humidifier due to vibration.

[0095] In order to prevent a gap from being formed between the packing member 230 and the cartridge 212, thus preventing air leakage therethrough, it is preferable for each of the hole H and the wing portion 231b of the packing portion 231 to have a shape corresponding to the shape of the end of the cartridge 212 inserted into the hole H. For example, when the end of the cartridge 212 inserted into the hole H is the fixing layer 212b, as in this embodiment, the hole H and the wing portion 231b of the packing portion 231 need to be designed so as to correspond to the shape of the fixing layer 212b which is to be determined by a mold used in a casting process.

[0096] In order to prevent a gap from being formed between the packing member 230 and the middle case 211, and thus prevent air leakage therethrough, the edge portion 232 may be provided with a second groove G2 into which at least a portion of an end of the middle case 211 is inserted. The second groove G2 may be formed on the surface of the packing member 230 opposite the surface of the packing member in which the first groove G1 is formed.

[0097] For example, as illustrated in FIG. 2(c), the entirety of one end of the middle case 211 may be inserted into the second groove G2 of the edge portion 232.

[0098] Alternatively, as illustrated in FIG. 3(a), one end of the middle case 211 may include an outer rim 211d and an inner rim 211e, between which a groove MG is provided, and only the inner rim 211e of the middle case 211 may be inserted into the second groove G2 of the edge portion 232. At this time, an outer rim 232a of the edge portion 232 abutting the second groove G2 is inserted into the groove MG of the middle case 211. This engagement structure more securely prevents air leakage through the packing member 230 and the middle case 211.

[0099] As another alternative, as illustrated in FIG. 3(b), one end of the middle case 211 may include an outer rim 211d and an inner rim 211e, between which a groove MG is provided, and an outer projection 232b of the edge portion 232 may be inserted into the groove MG of the middle case 211.

[0100] Hereinafter, a humidifier 300 for a fuel cell according to a second embodiment of the present disclosure including the packing member 230 according to the first embodiment of the present disclosure will be described with reference to FIG. 4.

[0101] As illustrated in FIG. 4, the humidifier 300 for a fuel cell according to the second embodiment of the present disclosure is substantially identical to the humidifier 200 for a fuel cell according to the first embodiment described above except that (i) the inner space of the middle case 211 is partitioned into a first space S1 and a second space S2 by partitions 211c and (ii) the cartridge 212 further includes an inner case 212c.

[0102] The inner case 212 is provided with an opening at each end thereof, and the hollow fiber membranes 212a are disposed in the inner case. The fixing layer 212b, in which the ends of the hollow fiber membranes 212a are potted, closes the opening of the inner case 212c.

[0103] As shown in FIG. 4, at least a portion of the fixing layer 212b may be located outside the inner case 212c, and the wing portion 231b of the packing member 230 may come into tight contact with the fixing layer 212b.

[0104] The inner case 212c has a plurality of holes MH1 arranged in a mesh shape for fluidic communication with the first space S1 (hereinafter referred to as “first mesh holes”) and a plurality of holes MH2 arranged in a mesh shape for fluidic communication with the second space S2 (hereinafter referred to as “second mesh holes”).

[0105] Off-gas introduced into the first space S1 of the middle case 211 through the off-gas inlet 211a flows into the inner case 212c through the first mesh holes MH1 and comes into contact with the outer surfaces of the hollow fiber membranes 212a. Subsequently, the off-gas, from which moisture has been removed, flows into the second space S2 through the second mesh holes MH2 and is discharged from the middle case 211 through the off-gas outlet 211c.

[0106] The cartridge 212 including the inner case 212c described above may not only be easily assembled to the middle case 211 but also may be easily replaced.

[0107] FIG. 5 is a sectional view schematically showing a humidifier 400 for a fuel cell according to a third embodiment of the present disclosure including the packing member 230 according to the first embodiment of the present disclosure.

[0108] As illustrated in FIG. 5, the humidifier 400 for a fuel cell according to the third embodiment of the present disclosure is substantially identical to the humidifier 300 for a fuel cell according to the second embodiment described above except that the entirety of the fixing layer 212b is located in the inner case 212c and that the wing portion 231b of the packing member 230 comes into tight contact with the inner case 212c, rather than the fixing layer 212b.

[0109] FIGS. 6(a) to 6(c) are an exploded perspective view, an exploded sectional view, and a sectional view schematically showing a humidifier 500 for a fuel cell according to a fourth embodiment of the present disclosure including a packing member 530 according to a second embodiment of the present disclosure, respectively.

[0110] As illustrated in FIGS. 6(a) to 6(c), the humidifier 500 for a fuel cell according to the fourth embodiment of the present disclosure is substantially identical to the humidifier 300 for a fuel cell according to the second embodiment described above except that (i) the humidification module 210 includes two or more cartridges 212, (ii) the packing portion 231 has two or more holes H into which the cartridges 212 are inserted, respectively, (iii) the packing portion 231 includes two or more wing portions 231b respectively surrounding the holes H, and (iv) the main body 231a includes a peripheral portion 231aa and at least one rib 23 lab between the holes H.

[0111] Since the plurality of cartridges 212, each of which includes the inner case 212c, is mounted in the middle case 211 so as to be spaced apart from each other by a predetermined distance, off-gas may be uniformly distributed to all of the hollow fiber membranes 212a, and only specific one(s) of the cartridges 212 that are defective may be selectively replaced, whereby it is possible to further reduce maintenance expenses of the humidifier 500 for a fuel cell.

[0112] FIG. 7 is a sectional view schematically showing a humidifier 600 for a fuel cell according to a fifth embodiment of the present disclosure including the packing member 530 according to the second embodiment of the present disclosure.

[0113] As illustrated in FIG. 7, the humidifier 600 for a fuel cell according to the fifth embodiment of the present disclosure is substantially identical to the humidifier 500 for a fuel cell according to the fourth embodiment described above except that the entirety of the fixing layer 212b of each of the cartridges 212 is located in an inner case 212c corresponding thereto and that the wing portions 231b of the packing member 230 come into tight contact with the inner cases 212c, rather than the fixing layers 212b.

[0114] FIGS. 8(a) and 8(b) are sectional views schematically showing packing members 230a and 530a according to third and fourth embodiments of the present disclosure, respectively.

[0115] The packing member 230a according to the third embodiment of the present disclosure is substantially identical to the packing member 230 according to the first embodiment described above except that the main body 231a has a third groove G3 formed on at least one of a first surface thereof that faces the cap 220 and a second surface thereof, which is opposite the first surface. For example, as shown in FIG. 8(a), the third groove G3 may be formed on the surface of the packing member 230a opposite the surface of the packing member in which the first groove G1 is formed (i.e. the second surface).

[0116] Similarly, the packing member 530a according to the fourth embodiment of the present disclosure is substantially identical to the packing member 530 according to the second embodiment described above except that the main body 231a (i.e. the peripheral portion 231aa and/or the rib 23 lab) has a third groove G3 formed on at least one of a first surface thereof that faces the cap 220 and a second surface thereof, which is opposite the first surface. For example, as shown in FIG. 8(b), the third groove G3 may be formed on the surface of the packing member 530a opposite the surface of the packing member in which the first groove G1 is formed (i.e. the second surface).

[0117] The third groove G3 of the packing member 230a or 530a (i) may enable easy mechanical assembly between the packing member 230a or 530a and the humidification module 210, (ii) may provide elastic force to the packing member 230a or 530a at the time of mechanical assembly, thereby improving airtightness, and (iii) may perform a vibration absorption function, thereby preventing damage to the apparatus due to vibration.

[0118] FIGS. 9(a) and 9(b) are sectional views schematically showing packing members 230b and 530b according to fifth and sixth embodiments of the present disclosure, respectively.

[0119] As illustrated in FIG. 9(a), the packing member 230b according to the fifth embodiment of the present disclosure is substantially identical to the packing member 230 according to the first embodiment described above except that the packing member further includes a reinforcement member 233 inserted into at least a portion of the main body 231a.

[0120] Similarly, the packing member 530b according to the sixth embodiment of the present disclosure is substantially identical to the packing member 530 according to the second embodiment described above except that the packing member further includes a reinforcement member 233 inserted into at least a portion of the main body 231a. For example, as shown in FIG. 9(b), the reinforcement member 233 may be inserted into the rib 23 lab of the main body 231a, which is particularly deformable. In addition, the reinforcement member 233 may be embedded in the peripheral portion 231aa of the main body 231a as well as the rib 231ab, although not shown.

[0121] The packing portion 231 and the edge portion 232 of the packing member 230b or 530b may be made of an elastic material having first hardness of 10 to 100 Shore A, preferably 30 to 70 Shore A, more preferably 40 to 60 Shore A (e.g. silicone or rubber), and the reinforcement member 233 may have second hardness, which is higher than the first hardness. For example, the reinforcement member 233 may be made of metal, thermoplastic resin, or thermosetting resin.

[0122] The reinforcement member 233, the hardness of which is higher than the hardness of the packing member 230b or 530b, prevents the main body 231a from being deformed when the packing member 230b or 530b is mechanically assembled to the humidification module 210 or during operation of the humidifier, whereby it is possible to more securely prevent air leakage.

[0123] FIGS. 10(a) and 10(b) are sectional views schematically showing packing members according to seventh and eighth embodiments of the present disclosure, respectively.

[0124] The packing member 230c according to the seventh embodiment of the present disclosure is substantially identical to the packing member 230 according to the first embodiment described above except that the wing portion 231b projects from the main body 231a toward the center of the hole H. That is, as shown in FIG. 10(a), the wing portion 231b according to the seventh embodiment of the present disclosure projects perpendicularly from the inner circumferential surface of the main body 231a toward the center of the hole H.

[0125] Similarly, as shown in FIG. 10(b), the packing member 530c according to the eighth embodiment of the present disclosure is substantially identical to the packing member 530 according to the second embodiment described above except that the wing portions 231b project from the main body 231a (i.e. the peripheral portion 231aa and the rib 231ab) toward the center of the hole H. That is, each of the wing portions 231b according to the eighth embodiment of the present disclosure projects perpendicularly from the inner circumferential surface of the peripheral portion 231aa and/or the rib 231ab toward the center of a corresponding one of the holes H.

[0126] Since the wing portion(s) 231b projects perpendicularly from the main body 231a toward the center of the hole H, the wing portion 231b, which is made of an elastic material, may be deformed when the end of the cartridge 212 is inserted into the hole H, whereby the volume of the wing portion may be reduced, and therefore the wing portion 231b may come into tighter contact with the end of the cartridge 212 due to elastic force thereof.

[0127] FIGS. 11(a) and 11(b) are sectional views schematically showing packing members according to ninth and tenth embodiments of the present disclosure, respectively.

[0128] As shown in FIG. 11(a), the packing member 230d according to the ninth embodiment of the present disclosure is substantially identical to the packing member 230 according to the first embodiment described above except that the wing portion 231b includes first and second sub-wing portions 231ba and 231bb arranged side by side in a central axial direction of the hole H and that both the first and second sub-wing portions 231ba and 231bb project toward the center of the hole H. The wing portion 231b may further include at least one third sub-wing portion (not shown) arranged parallel to the first and second sub-wing portions 231ba and 231bb in the central axial direction of the hole H, the third sub-wing portion projecting toward the center of the hole H.

[0129] Similarly, as shown in FIG. 11(b), the packing member 530d according to the tenth embodiment of the present disclosure is substantially identical to the packing member 530 according to the second embodiment described above except that each of the wing portions 231b includes first and second sub-wing portions 231ba and 231bb arranged side by side in a central axial direction of a corresponding one of the holes H and that both the first and second sub-wing portions 231ba and 231bb project from the main body 231a (i.e. the peripheral portion 231aa and the rib 231ab) toward the center of the hole H. Each of the wing portions 231b according to the tenth embodiment of the present disclosure may also further include at least one third sub-wing portion (not shown) arranged parallel to the first and second sub-wing portions 231ba and 231bb in the central axial direction of a corresponding one of the holes H, the third sub-wing portion projecting toward the center of the hole H.

[0130] FIGS. 12(a) and 12(b) are sectional views schematically showing packing members according to eleventh and twelfth embodiments of the present disclosure, respectively.

[0131] As shown in FIG. 12(a), the packing member 230d according to the eleventh embodiment of the present disclosure is substantially identical to the packing member 230 according to the first embodiment described above except that the wing portion 231b includes first and second sub-wing portions 231ba and 231bb arranged side by side in the central axial direction of the hole H, that one of the first and second sub-wing portions (the first sub-wing portion 231ba in FIG. 12(a)) projects from the main body 231a toward the center of the hole H, and that the other sub-wing (the second sub-wing portion 231bb in FIG. 12(a)) is inclined relative to the main body 231a at a predetermined angle (e.g. 5° or more and less than 90°). The wing portion 231b may further include at least one third sub-wing portion (not shown) arranged parallel to the first and second sub-wing portions 231ba and 231bb in the central axial direction of the hole H, the third sub-wing portion projecting toward the center of the hole H or being inclined relative to the main body 231a at a predetermined angle.

[0132] Similarly, as shown in FIG. 12(b), the packing member 530e according to the twelfth embodiment of the present disclosure is substantially identical to the packing member 530 according to the second embodiment described above except that each of the wing portions 231b includes first and second sub-wing portions 231ba and 231bb arranged side by side in the central axial direction of a corresponding one of the holes H, that one of the first and second sub-wing portions (the first sub-wing portion 231ba in FIG. 12(b)) projects from the main body 231a toward the center of the hole H, and that the other sub-wing (the second sub-wing portion 231bb in FIG. 12(b)) is inclined relative to the main body 231a at a predetermined angle (e.g. 5° or more and less than 90°). Each of the wing portions 231b according to the twelfth embodiment of the present disclosure may also further include at least one third sub-wing portion (not shown) arranged parallel to the first and second sub-wing portions 231ba and 231bb in the central axial direction of a corresponding one of the holes H, the third sub-wing portion projecting toward the center of the hole H or being inclined relative to the main body 231a at a predetermined angle.

[0133] In the eleventh and twelfth embodiments described above, the first sub-wing portion 231ba, which projects from the main body 231a toward the center of the hole H, may be disposed so as to face the first groove G1 between the second sub-wing portion 231bb and the main body 231a, as illustrated in FIGS. 11(a) and 11(b). However, the positions of the first and second sub-wing portions 231ba and 231bb may be interchanged.

[0134] According to the ninth to twelfth embodiments of the present disclosure, it is possible to achieve double packing through the first and second sub-wing portions 231ba and 231bb spaced apart from each other by a predetermined distance, and therefore it is possible to more securely prevent gas leakage.

[0135] It should be understood that the features of various embodiments of the present disclosure described above may be combined using an arbitrary method to derive various modifications of the embodiments and that the derived modifications also fall into the scope of rights of the present disclosure. For example, each of the packing members 230a and 530a according to the third and fourth embodiments of the present disclosure may also include the reinforcement member 233 according to the fifth or sixth embodiment, and each of the packing members 230c, 530c, 230d, 530d, 230e, and 530e according to the seventh to twelfth embodiments of the present disclosure may also include the third groove G3 and/or the reinforcement member 233 according to the third to sixth embodiments.