Pipeline connection structure and fuel cell

Abstract

The utility model relates to the technical field of fuel cells, and provides a pipeline connecting structure and a fuel cell, the pipeline connecting structure comprises a first connecting piece, a first sealing piece, a second sealing piece and a second connecting piece, the first connecting piece comprises a first pipe body, a first connecting part and a supporting part; the first sealing piece is located in the containing groove between the first connecting part and the first pipe body. The second sealing piece is sleeved outside the supporting part; the second connecting piece comprises a second pipe body, a second connecting part, a first abutting part and a second abutting part, the second connecting part is located between the first abutting part and the second abutting part, the end of the first pipe body is located in the second pipe body, and the first abutting part and the second abutting part abut against the first sealing piece and the second sealing piece correspondingly; and the second connecting part is connected with the first connecting part. By means of the arrangement, the first sealing piece and the second sealing piece are matched to achieve double sealing between the first connecting piece and the second connecting piece, and the air tightness is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to a pipeline connection structure and a fuel cell. Background Art

[0002] A fuel cell is a chemical device that directly converts the chemical energy of a fuel into electrical energy. It is also called an electrochemical generator. It has the advantages of high power generation efficiency and less environmental pollution. Fuel cells drive electric devices by converting hydrogen and oxygen into electrical energy and water under the catalytic action of hydrogen plates and oxygen plates.

[0003] The end plate of the fuel cell is provided with a hydrogen inlet and a hydrogen outlet, and both the hydrogen inlet and the hydrogen outlet are connected to a hydrogen transmission pipeline. The hydrogen inlet supplies hydrogen from the hydrogen source to enter the interior of the fuel cell, and the hydrogen outlet supplies hydrogen that has not participated in the chemical reaction to be discharged. When the hydrogen transmission pipeline is connected to the hydrogen inlet or hydrogen outlet, generally only a single-layer sealing ring is used. The sealing structure is simple and prone to aging, cracks, wear or damage. The airtightness cannot be guaranteed, resulting in hydrogen leakage. Hydrogen is a flammable and explosive gas. When mixed with air at a certain concentration, it may cause a fire or explosion, threatening personnel safety and equipment integrity.

[0004] Therefore, how to solve the problem of poor airtightness at the connection position between the fuel cell and the hydrogen gas transmission pipeline in the prior art has become an important technical problem to be solved by those skilled in the art. Utility Model Content

[0005] The utility model provides a pipeline connection structure and a fuel cell, which are used to solve the defect of poor air tightness at the connection position between the fuel cell and the hydrogen gas transmission pipeline in the prior art.

[0006] The utility model provides a pipeline connection structure, comprising:

[0007] A first connecting member includes a first tube body, and a first connecting portion and a supporting portion fixedly disposed outside the first tube body, wherein a receiving groove is formed between the first connecting portion and an outer side wall of the first tube body;

[0008] A first sealing member, embedded in the receiving groove;

[0009] A second sealing member is sleeved on the outside of the supporting portion;

[0010] The second connecting member includes a second tube body and a second connecting portion fixedly arranged at one end of the second tube body, a first pressing portion and a second pressing portion, wherein the second connecting portion is located between the first pressing portion and the second pressing portion, the first end of the first tube body is located inside the second tube body, the first pressing portion is located in the accommodating groove and presses against the first sealing member, the second connecting portion is connected to the first connecting portion, and the second pressing portion presses against the second sealing member.

[0011] According to a pipeline connection structure provided by the utility model, an escape space is formed between the second connection part and the first pressing part, the first connection part is located in the escape space, and the first connection part is threadedly connected to the second connection part.

[0012] According to a pipeline connection structure provided by the utility model, the support portion is located on a side of the first connection portion away from the first end of the first tube body, the support portion is sleeved on the outside of the first tube body, and the cross-sectional shape of the support portion, the cross-sectional shape of the second sealing member, and the cross-sectional shape of the second abutting portion are all circular rings;

[0013] The outer diameter of the supporting portion, the inner diameter of the second sealing member, the outer diameter of the second sealing member and the inner diameter of the second abutting portion all gradually increase in a direction away from the first connecting portion.

[0014] According to a pipeline connection structure provided by the utility model, the generatrix of the outer side surface of the support portion, the generatrix of the inner side surface of the second seal, the generatrix of the outer side surface of the second seal and the generatrix of the inner side surface of the second abutting portion are parallel straight lines.

[0015] According to a pipeline connection structure provided by the utility model, the angle between the generatrix of the outer side surface of the support portion and the central axis of the first tube body is 20° to 40°.

[0016] According to a pipeline connection structure provided by the utility model, an inner flange is provided at one end of the second tube body away from the second connection portion, and the first end of the first tube body abuts against the inner flange.

[0017] According to a pipeline connection structure provided by the utility model, the second pipe body, the second connecting portion, the first pressing portion and the second pressing portion are integrally formed.

[0018] According to a pipeline connection structure provided by the utility model, the first sealing component is a sealing ring.

[0019] The utility model also provides a fuel cell, comprising an end plate and the above-mentioned pipeline connection structure, wherein the end plate is connected to the gas transmission pipeline through the pipeline connection structure.

[0020] According to a fuel cell provided by the utility model, a hydrogen inlet and a hydrogen outlet are provided on the end plate, and the gas transmission pipeline includes a hydrogen inlet pipeline and a hydrogen outlet pipeline;

[0021] The hydrogen inlet is connected to the hydrogen inlet pipeline via the pipeline connection structure, and / or the hydrogen outlet is connected to the hydrogen outlet pipeline via the pipeline connection structure.

[0022] The pipeline connection structure provided by the utility model includes a first connector, a first seal, a second seal and a second connector. The first connector includes a first tube body, a first connecting portion and a supporting portion. The first connecting portion and the supporting portion are fixedly arranged on the outside of the first tube body. A receiving groove is formed between the first connecting portion and the outer wall of the first tube body, and the first seal is embedded in the receiving groove. The second seal is sleeved on the outside of the supporting portion. The second connector includes a second tube body, a second connecting portion, a first abutting portion and a second abutting portion. The second connecting portion, the first abutting portion and the second abutting portion are all fixedly arranged on one end of the second tube body, and the second connecting portion is located between the first abutting portion and the second abutting portion. The first end of the first tube body can extend into the interior of the second tube body, and the second connecting portion is connected to the first connecting portion to connect the first connector and the second connector together. The first abutting portion can extend into the receiving groove and abut the first seal to achieve a first seal. At the same time, the second abutting portion abuts the second seal against the supporting portion to achieve a second seal. With such an arrangement, the first seal and the second seal cooperate to achieve double sealing between the first connector and the second connector, greatly improving the airtightness between the first connector and the second connector, and solving the problem of poor airtightness at the connection position between the fuel cell and the hydrogen gas pipeline in the prior art.

[0023] Furthermore, in the fuel cell provided by the present invention, since it has the pipe connection structure as described above, it also has the various advantages as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of a fuel cell with a pipeline connection structure provided by the utility model.

[0026] Figure 2It is a cross-sectional view of the pipeline connection structure provided by the utility model.

[0027] Figure 3 yes Figure 2 Enlarged view of I.

[0028] Figure 4 It is an exploded view of the pipeline connection structure provided by the utility model.

[0029] Figure 5 It is an exploded view of a fuel cell with a pipeline connection structure provided by the utility model.

[0030] Reference numerals:

[0031] 1. First tube body; 2. First connecting part; 3. Support part; 4. First sealing member; 5. Second sealing member; 6. Second connecting member; 7. Second tube body; 8. Second connecting part; 9. Abutting part; 10. Pressing part; 11. Inner flange; 12. Hydrogen inlet pipeline; 13. Hydrogen outlet pipeline; 14. Hydrogen inlet port; 15. First end plate; 16. Hydrogen electrode plate; 17. First diffusion layer; 18. First catalyst layer; 19. Displacement film; 20. Second catalyst layer; 21. Second diffusion layer; 22. Oxygen electrode plate; 23. Second end plate; 24. Guide channel; 25. Fixing bolt; 26. Limiting groove; 27. Oxygen inlet pipe; 28. Oxygen outlet pipe; 29. ​​Fixing hole. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0034] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0035] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0037] Combine the following Figures 1 to 5 The utility model is described in detail.

[0038] like Figures 1 to 5 As shown, the pipeline connection structure provided by the embodiment of the utility model includes a first connecting member, a first sealing member 4, a second sealing member 5 and a second connecting member 6.

[0039] Specifically, when two gas pipelines are connected, the first connector can be fixedly connected to one of the gas pipelines, and the second connector 6 can be fixedly connected to the other gas pipeline. The connection between the first connector and the gas pipeline and the connection between the second connector 6 and the gas pipeline can be achieved by welding. When the end plate of the fuel cell is connected to the gas pipeline, the first connector can be fixedly connected to the end plate, and the second connector 6 can be fixedly connected to the gas pipeline. The connection between the first connector and the end plate and the connection between the second connector 6 and the gas pipeline can be achieved by welding.

[0040] The first connecting member includes a first tube body 1, a first connecting portion 2 and a supporting portion 3, wherein the first connecting portion 2 and the supporting portion 3 are fixedly arranged outside the first tube body 1. A receiving groove is formed between the first connecting portion 2 and the outer side wall of the first tube body 1, and the first sealing member 4 is embedded in the receiving groove. The second sealing member 5 is sleeved outside the supporting portion 3.

[0041] The second connecting member 6 includes a second tube body 7, a second connecting portion 8, an abutting portion 9 and a pressing portion 10. The second connecting portion 8, the abutting portion 9 and the pressing portion 10 are all fixedly arranged at one end of the second tube body 7, and the second connecting portion 8 is located between the abutting portion 9 and the pressing portion 10.

[0042] The first end of the first tube body 1 can extend into the interior of the second tube body 7 , and the second connecting portion 8 is connected to the first connecting portion 2 to connect the first connecting member and the second connecting member 6 together.

[0043] The abutting portion 9 can extend into the receiving groove and abut against the first sealing member 4 to achieve a first seal. Meanwhile, the pressing portion 10 abuts against the second sealing member 5 to the supporting portion 3 to achieve a second seal.

[0044] With such arrangement, the first sealing member 4 and the second sealing member 5 cooperate to achieve double sealing between the first connecting member and the second connecting member 6, thereby greatly improving the airtightness between the first connecting member and the second connecting member 6, and solving the problem of poor airtightness at the connection position between the fuel cell and the hydrogen gas transmission pipeline in the prior art, thereby avoiding leakage of flammable gases such as hydrogen during transportation, and further avoiding dangerous events such as fire and explosion due to leakage of flammable gases such as hydrogen during use, thereby improving safety of use.

[0045] In the embodiment of the utility model, an escape space is formed between the second connection portion 8 and the abutting portion 9 , and the escape space is used to escape the first connection portion 2 so that the first connection portion 2 can extend between the second connection portion 8 and the abutting portion 9 .

[0046] The first connection part 2 is threadedly connected to the second connection part 8. Specifically, an external thread may be provided on the outer side of the first connection part 2, and an internal thread may be provided on the inner side of the second connection part 8, and the internal thread is adapted to the external thread.

[0047] The threaded connection structure between the first connection part 2 and the second connection part 8 can be regarded as another seal in addition to the first sealing member 4 and the second sealing member 5 , which can further improve the air tightness between the first connection member and the second connection member 6 .

[0048] The connection structure between the first connection part 2 and the second connection part 8 is simple, and the first connection part 2 extends between the second connection part 8 and the abutment part 9, which is compact in structure, and is conducive to reducing the length dimension of the pipeline connection structure along the axis direction of the first tube body 1, and occupies a small space. Moreover, the setting of the avoidance space enables the joint gap between the first connection member and the second connection member 6 to have multiple detours, which can further improve the airtightness between the first connection member and the second connection member 6.

[0049] In other embodiments, no escape space is provided between the second connection portion 8 and the abutment portion 9, the abutment portion 9, the second connection portion 8 and the pressing portion 10 are sequentially distributed, the length dimension of the second connection member 6 along the axial direction of the second tube body 7 is relatively large, and accordingly, the length dimension of the pipeline connection structure along the axial direction of the first tube body 1 is relatively large, and the occupied space is relatively large. Moreover, the detour portion of the joint gap between the first connection member and the second connection member 6 is relatively small, and the air tightness is relatively poor.

[0050] In the embodiment of the utility model, the support portion 3 is arranged on a side of the first connection portion 2 away from the first end of the first tube body 1 . Specifically, the support portion 3 and the first connection portion 2 can be distributed sequentially starting from the second end of the first tube body 1 .

[0051] When the first connector is connected to the gas pipeline or the first connector is connected to the end plate, the first tube body 1 and the support portion 3 can be fixedly connected to the gas pipeline at the same time or the first tube body 1 and the support portion 3 can be fixedly connected to the end plate at the same time. Taking the connection of the first connector to the end plate as an example, the first tube body 1 and the support portion 3 are both fixedly connected to the end plate, and the support portion 3 cooperates with the first tube body 1, which increases the contact area between the first connector and the end plate, and can improve the stability and reliability of the connection structure between the first connector and the end plate.

[0052] In this embodiment, the support part 3 is configured as an annular structure, so that the support part 3 is sleeved outside the first tube 1. The cross-sectional shapes of the support part 3, the second sealing member 5 and the pressing part 10 are all circular.

[0053] It should be noted that the cross section of the supporting portion 3 , the cross section of the second sealing member 5 and the cross section of the pressing portion 10 are all perpendicular to the axis of the first tube body 1 .

[0054] The inner side surface of the supporting portion 3 is a cylindrical surface, which is matched with the outer side surface of the first tube body 1 .

[0055] The outer diameter of the support portion 3, the inner diameter of the second seal 5, the outer diameter of the second seal 5 and the inner diameter of the clamping portion 10 all gradually increase in the direction away from the first connecting portion 2. When the clamping portion 10 presses the second seal 5 against the support portion 3, the pressing force generated by the clamping portion 10 and the support portion 3 on the second seal 5 has both a component force along the axial direction of the first tube body 1 and a component force along the radial direction of the second tube body 7, which is beneficial to improving the stability of the second seal 5 and ensuring that the second seal 5 is evenly stressed.

[0056] The generatrix of the outer side surface of the support portion 3 , the generatrix of the inner side surface of the second seal 5 , the generatrix of the outer side surface of the second seal 5 and the generatrix of the inner side surface of the pressing portion 10 are parallel to each other, which can further improve the force uniformity of the second seal 5 .

[0057] The generatrix of the outer side surface of the support portion 3 may be a straight line, that is, the support portion 3 is in the shape of a hollow truncated cone.

[0058] In other embodiments, the generatrix of the outer side surface of the support portion 3 is an arc shape, that is, the outer side surface of the support portion 3, the inner side surface of the second seal 5, the outer side surface of the second seal 5 and the inner side surface of the pressing portion 10 are similar to the side surface of a table, also known as a ball zone surface. In this case, although the stability of the second seal 5 can be ensured and the force on the second seal 5 can be evenly applied, the ball zone surface is difficult to process, that is, the support portion 3, the second seal 5 and the pressing portion 10 are difficult to process, which leads to a high cost of the pipeline connection structure.

[0059] In this embodiment, the generatrix of the outer side surface of the support portion 3, the generatrix of the inner side surface of the second seal 5, the generatrix of the outer side surface of the second seal 5 and the generatrix of the inner side surface of the clamping portion 10 are arranged to be straight lines parallel to each other, and the angle between the generatrix of the outer side surface of the support portion 3 and the central axis of the first tube body 1 is 20° to 40°.

[0060] Specifically, the angle between the generatrix of the outer side surface of the support portion 3 and the central axis of the first tube body 1 can be set to 30°.

[0061] In other embodiments, the angle between the generatrix of the outer side surface of the support portion 3 and the central axis of the first tube body 1 is less than 20° or greater than 40°, which makes the outer side surface of the support portion 3 too steep or too gentle, resulting in poor stability and uneven force of the second seal 5, which is not conducive to improving the airtightness between the first seal 4 and the second seal 5.

[0062] In the embodiment of the utility model, an inner flange 11 is provided at one end of the second tube body 7 away from the second connecting portion 8, and the inner flange 11 forms a step structure with the inner side wall of the second tube body 7. The first end of the first tube body 1 abuts against the inner flange 11 to limit the relative position of the first tube body 1 and the second tube body 7 along the axial direction of the first tube body 1. At the same time, the abutment between the first tube body 1 and the inner flange 11 can further improve the airtightness between the first connecting member 6 and the second connecting member 6.

[0063] It should be noted that the inner diameter of the gas pipeline connected to the second connecting member 6 needs to be consistent with the inner diameter of the inner flange 11 .

[0064] In other embodiments, the inner flange 11 is not provided on the second tube body 7, and the relative position of the first tube body 1 and the second tube body 7 along their own axial direction is realized only by the interaction between the abutting portion 9 and the bottom wall of the accommodating groove and the interaction between the clamping portion 10 and the supporting portion 3. When the first connecting portion 2 and the second connecting portion 8 are connected together, it is easy to cause excessive clamping force on the first seal 4 and the second seal 5, thereby damaging the first seal 4 and the second seal 5, and causing the sealing failure of the first seal 4 and the second seal 5.

[0065] In some embodiments, the first connecting member and the second connecting member 6 are both made of metal.

[0066] In the embodiment of the utility model, the second tube body 7, the second connecting portion 8, the abutting portion 9 and the pressing portion 10 are integrally formed by a casting process, which has a simple process and a low cost.

[0067] In other embodiments, the second tube body 7, the second connecting portion 8, the abutting portion 9 and the pressing portion 10 can be processed into corresponding shapes respectively, and then the second tube body 7, the second connecting portion 8, the pressing portion 10 and the pressing portion 10 are fixedly connected together by welding.

[0068] In this embodiment, a sealing ring can be directly selected as the first sealing member 4, and the sealing ring can be, but is not limited to, an O-type rubber sealing ring. The sealing ring is a standard part, which is conducive to reducing costs.

[0069] On the other hand, the embodiment of the utility model further provides a fuel cell, comprising an end plate and a pipe connection structure provided in any of the above embodiments, wherein the end plate is connected to a gas pipeline through the pipe connection structure provided in the above embodiments. The pipe connection structure in the above embodiments has strong air tightness, so the fuel cell in this embodiment can effectively avoid hydrogen leakage and has high safety. The derivation process of the beneficial effects of the fuel cell in the embodiment of the utility model is generally similar to the derivation process of the beneficial effects of the above pipe connection structure, so it will not be repeated here.

[0070] The gas pipeline can be, but is not limited to, a pipeline for conveying flammable gas, and can also be a pipeline for conveying non-flammable gas. For a fuel cell, the gas pipeline can be not only a hydrogen gas pipeline, but also an oxygen gas pipeline.

[0071] In this embodiment, the above-mentioned pipeline connection structure is only applied between the end plate and the hydrogen gas transmission pipe.

[0072] In a specific embodiment, a hydrogen inlet 14 and a hydrogen outlet are provided on the end plate, and the gas delivery pipeline includes a hydrogen inlet pipeline 12 and a hydrogen outlet pipeline 13. The hydrogen inlet 14 is connected to the hydrogen inlet pipeline 12 to provide sufficient hydrogen to the interior of the fuel cell. The hydrogen outlet is connected to the hydrogen outlet pipeline 13 to discharge the hydrogen that has not been completely reacted inside the fuel cell.

[0073] Only the hydrogen inlet 14 can be connected to the hydrogen inlet pipeline 12 through the above-mentioned pipeline connection structure, or only the hydrogen outlet can be connected to the hydrogen outlet pipeline 13 through the above-mentioned pipeline connection structure. Alternatively, both the hydrogen inlet 14 and the hydrogen outlet can be connected to the hydrogen inlet pipeline 12 and the hydrogen outlet can be connected to the hydrogen outlet pipeline 13 through the above-mentioned pipeline connection structure.

[0074] The safety of the fuel cell can be greatly improved by connecting the hydrogen inlet 14 and the hydrogen outlet to the hydrogen inlet pipeline 12 and the hydrogen outlet pipeline 13 through the above pipeline connection structure.

[0075] In addition to the above-mentioned end plate (the above-mentioned end plate is referred to as the first end plate 15), the fuel cell also includes a hydrogen electrode plate 16, a first diffusion layer 17, a first catalyst layer 18, a replacement membrane 19, a second catalyst layer 20, a second diffusion layer 21, an oxygen electrode plate 22 and a second end plate 23 which are arranged in sequence on one side of the first end plate 15.

[0076] An air inlet is formed through the outer wall of the hydrogen electrode plate 16, a guide channel 24 is fixedly connected to the outer wall of the hydrogen electrode plate 16, and an air outlet is formed through the outer wall of the hydrogen electrode plate 16. By setting the air inlet and the guide channel 24, hydrogen can flow more smoothly after entering the hydrogen electrode plate 16.

[0077] The outer wall of the first end plate 15 and the outer wall of the second end plate 23 are penetrated with fixing holes 29, and the first end plate 15 is fixedly connected with fixing bolts 25 through the fixing holes 29. The outer wall of the hydrogen electrode plate 16 and the outer wall of the oxygen electrode plate 22 are penetrated with limiting grooves 26, and the fixing bolts 25 apply force to the first end plate 15 and the second end plate 23 to clamp and fix the various parts between the first end plate 15 and the second end plate 23. By providing the fixing bolts 25 and the limiting grooves 26, it is convenient to limit the positions of the hydrogen electrode plate 16 and the oxygen electrode plate 22, so as to avoid the position of the hydrogen electrode plate 16 from being offset during use.

[0078] The first diffusion layer 17 facilitates the diffusion of hydrogen so that the hydrogen can fully react. The first catalyst layer 18 facilitates the catalysis of hydrogen to increase the reaction rate. After the hydrogen enters the flow guide channel 24, it diffuses through the first diffusion layer 17. While diffusing, it is catalyzed by the first catalyst layer 18 and finally contacts with oxygen at the displacement membrane 19 to exchange protons.

[0079] The arrangement of the oxygen electrode plate 22 facilitates the conduction of oxygen so that the oxygen can fully contact and react with the hydrogen. When in use, the oxygen enters the oxygen electrode plate 22, diffuses through the second diffusion layer 21 and is catalyzed by the second catalyst layer 20, and then reacts with the hydrogen at the displacement film 19.

[0080] An oxygen inlet pipe 27 and an oxygen outlet pipe 28 are fixedly connected to the outer side wall of the second end plate 23. The oxygen inlet pipe 27 is convenient for providing oxygen, and the oxygen outlet pipe 28 is convenient for discharging oxygen that has not completely reacted with hydrogen.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A pipeline connection structure, characterized in that: include: A first connecting member includes a first tube body, and a first connecting portion and a supporting portion fixedly disposed outside the first tube body, wherein a receiving groove is formed between the first connecting portion and an outer side wall of the first tube body; A first sealing member, embedded in the receiving groove; A second sealing member is sleeved on the outside of the supporting portion; The second connecting member includes a second tube body and a second connecting portion, an abutting portion and a pressing portion fixedly arranged at one end of the second tube body, the second connecting portion is located between the abutting portion and the pressing portion, the first end of the first tube body is located inside the second tube body, the abutting portion is located in the accommodating groove and presses against the first sealing member, the second connecting portion is connected to the first connecting portion, and the pressing portion presses against the second sealing member.

2. The pipeline connection structure according to claim 1, characterized in that: An escape space is formed between the second connection portion and the abutting portion, the first connection portion is located in the escape space, and the first connection portion is threadedly connected to the second connection portion.

3. The pipeline connection structure according to claim 1 or 2, characterized in that: The support portion is located at a side of the first connecting portion away from the first end of the first tube body, the support portion is sleeved on the outside of the first tube body, and the cross-sectional shapes of the support portion, the second sealing member and the pressing portion are all circular; The outer diameter of the supporting portion, the inner diameter of the second sealing member, the outer diameter of the second sealing member, and the inner diameter of the pressing portion all gradually increase in a direction away from the first connecting portion.

4. The pipeline connection structure according to claim 3, characterized in that: The generatrix of the outer side surface of the support portion, the generatrix of the inner side surface of the second seal, the generatrix of the outer side surface of the second seal, and the generatrix of the inner side surface of the pressing portion are straight lines parallel to each other.

5. The pipeline connection structure according to claim 4, characterized in that: The included angle between the generatrix of the outer side surface of the support portion and the central axis of the first tube body is 20° to 40°.

6. The pipeline connection structure according to claim 1, characterized in that: An inner flange is disposed at one end of the second tube away from the second connecting portion, and the first end of the first tube abuts against the inner flange.

7. The pipeline connection structure according to claim 1, characterized in that: The second tube body, the second connecting portion, the abutting portion and the pressing portion are integrally formed.

8. The pipeline connection structure according to claim 1, characterized in that: The first sealing member is a sealing ring.

9. A fuel cell, characterized in that: It comprises an end plate and a pipeline connection structure as claimed in any one of claims 1 to 8, wherein the end plate is connected to the gas pipeline through the pipeline connection structure.

10. The fuel cell according to claim 9, characterized in that The end plate is provided with a hydrogen inlet and a hydrogen outlet, and the gas transmission pipeline includes a hydrogen inlet pipeline and a hydrogen outlet pipeline; The hydrogen inlet is connected to the hydrogen inlet pipeline via the pipeline connection structure, and / or the hydrogen outlet is connected to the hydrogen outlet pipeline via the pipeline connection structure.

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