Pipeline joint and fuel cell system with same

Abstract

The utility model discloses a pipeline joint and a fuel cell system with the same. Belongs to the technical field of fuel cell systems, the pipeline joint comprises a shell assembly, a filter element and an elastic piece, the shell assembly is provided with a communicating cavity, a joint inlet and a joint outlet, the joint inlet and the joint outlet are communicated with the communicating cavity, and the filter element is arranged in the communicating cavity and used for filtering fluid media flowing through the communicating cavity and can filter impurities flowing along with the fluid media; the elastic piece is connected between the filter element and the inner end wall of the communicating cavity in an abutting mode and used for exerting pressing force on the filter element, and the direction of the pressing force is the same as the flowing direction of the fluid medium passing through the filter element, so that the edge of the filter element and the inner ring wall of the communicating cavity are connected in an abutting and sealing mode, impurities can be effectively prevented from directly flowing to the connector outlet, and the filter element is prevented from being damaged. And the filtering effect of the filter element is ensured.

Description

Technical Field

[0001] This utility model relates to the field of fuel cell system technology, and more specifically, to a pipeline connector and a fuel cell system having the same. Background Technology

[0002] In related technologies, the fuel cell in the fuel cell system is directly connected to the hydrogen storage device. When the hydrogen storage device supplies hydrogen to the fuel cell, it may carry impurities. Impurities entering the fuel cell will not only affect the working efficiency of the fuel cell, but may also affect the service life of the fuel cell. Therefore, it is urgent to design a filtration structure to filter out impurities. Utility Model Content

[0003] This invention aims to at least partially solve one of the aforementioned technical problems in the prior art. To this end, this invention proposes a pipe connector that can filter out impurities and achieve cleaning of the fluid medium.

[0004] This invention also proposes a fuel cell system having the aforementioned pipeline connector.

[0005] A pipe connector according to an embodiment of the present invention includes: a housing assembly, a filter element, and an elastic element. The housing assembly has a communicating cavity and a connector inlet and a connector outlet communicating with the communicating cavity. The filter element is disposed in the communicating cavity and is used to filter the fluid medium flowing through the communicating cavity. The elastic element abuts between the filter element and the inner end wall of the communicating cavity, and the elastic element is used to apply a clamping force to the filter element. The direction of the clamping force is the same as the flow direction of the fluid medium through the filter element, so that the edge of the filter element abuts and seals against the inner annular wall of the communicating cavity.

[0006] According to the embodiment of the present utility model, the filter element of the pipe connector is used to filter the fluid medium flowing through the connecting cavity. It can filter out impurities that flow along with the fluid medium, thereby cleaning the fluid medium. The elastic element in the pipe connector can apply a clamping force to the filter element so that the edge of the filter element abuts and seals against the inner ring wall of the connecting cavity. This can effectively prevent impurities from flowing directly to the connector outlet, which is beneficial to ensuring the filtration effect of the filter element.

[0007] According to some embodiments of the present invention, the inner annular wall of the communicating cavity has an annular centering surface with an inner diameter that gradually decreases in the direction away from the connector inlet, and the edge of the filter element abuts and seals against the annular centering surface.

[0008] According to some embodiments of the present invention, the filter element includes: a mesh cylinder and a mesh plate, wherein the edge of the mesh cylinder away from the connector inlet abuts and seals against the inner annular wall of the communicating cavity; the end of the mesh cylinder near the connector inlet is connected to the mesh plate, and the elastic element abuts against the mesh plate.

[0009] According to some embodiments of this utility model, the filter element is made of stainless steel.

[0010] According to some embodiments of this utility model, the opening directions of the connector inlet and the connector outlet are different.

[0011] According to some embodiments of the present invention, the communicating cavity includes: a first communicating segment and a second communicating segment, wherein the connector inlet, the first communicating segment, the second communicating segment and the connector outlet are connected in sequence, and the first communicating segment and the second communicating segment extend in different directions.

[0012] According to some embodiments of the present invention, the housing assembly includes: a first housing, a second housing, and a housing connector. The first housing has the connector inlet; the second housing has the connector outlet; the second housing and the first housing are mated together and jointly define the communicating cavity; the housing connector is sleeved on the outside of the first housing and the second housing; one of the first housing and the second housing is threadedly engaged with the housing connector, and the other of the two housings is limitedly engaged with the housing connector.

[0013] According to some embodiments of the present invention, the housing assembly further includes a sealing gasket, which is sandwiched at the joint between the first housing and the second housing.

[0014] According to some embodiments of the present invention, the housing assembly further includes: a limiting plate and a locking nut, the locking nut being sleeved on the outside of the second housing and threadedly engaged with the second housing, the limiting plate being located on the side of the locking nut closer to the connector outlet, and the locking nut being used to adjust the distance between the limiting plate and the connector outlet.

[0015] A fuel cell system according to another embodiment of the present invention includes: a hydrogen storage device, a fuel cell, and the aforementioned pipeline connector, wherein the hydrogen storage device is connected to the inlet of the connector, and the fuel cell is connected to the outlet of the connector.

[0016] According to the fuel cell system of this utility model embodiment, the filter element in its pipeline joint can be used to filter the hydrogen supplied to the fuel cell by the hydrogen storage device, so as to clean the hydrogen and improve the working efficiency of the fuel cell. The elastic element in the pipeline joint can apply a clamping force to the filter element so that the edge of the filter element abuts and seals against the inner ring wall of the connecting cavity, which can effectively prevent impurities from flowing into the fuel cell and achieve the purpose of protecting the hydrogen injection and stack of the fuel cell.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of a pipe joint according to an embodiment of the present utility model;

[0019] Figure 2 This is a front view of a pipe connector according to an embodiment of the present utility model;

[0020] Figure 3 This is a schematic diagram of a fuel cell system according to an embodiment of the present invention.

[0021] Figure label:

[0022] Housing assembly 1; First housing 11; Connector inlet 111; Second housing 12; Connector outlet 121; Housing connector 13; Sleeve 131; Limiting ring 132; Communicating cavity 14; Annular centering surface 141; First communicating section 142; Second communicating section 143; Sealing gasket 15; Limiting piece 16; Locking nut 17;

[0023] Filter element 2; mesh cylinder 21; mesh plate 22; elastic element 3;

[0024] Pipeline connector 10; hydrogen storage device 20; supply pipeline 201; fuel cell 30; fuel cell system 100. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0026] In the description of this utility model, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] The following is combined Figures 1-3 A detailed description is given of the pipe connector 10 and the fuel cell system 100 having the same according to an embodiment of the present invention.

[0030] Reference Figure 1 and Figure 2 As shown, the pipe connector 10 according to an embodiment of the present invention includes: a housing assembly 1, a filter element 2, and an elastic element 3. The housing assembly 1 has a communicating cavity 14 and a connector inlet 111 and a connector outlet 121 communicating with the communicating cavity 14. The filter element 2 is disposed in the communicating cavity 14 and is used to filter the fluid medium flowing through the communicating cavity 14. The elastic element 3 abuts between the filter element 2 and the inner end wall of the communicating cavity 14. The elastic element 3 is used to apply a pressing force to the filter element 2. The direction of the pressing force is the same as the flow direction of the fluid medium through the filter element 2, so that the edge of the filter element 2 abuts and seals with the inner ring wall of the communicating cavity 14.

[0031] It is understandable that filter element 2 is used to filter the fluid medium flowing through the connecting cavity 14, and can filter out impurities flowing along with the fluid medium, thereby cleaning the fluid medium. Under the action of the clamping force applied by the elastic element 3, the edge of filter element 2 abuts and seals against the inner ring wall of the connecting cavity 14, so as to eliminate the gap between the edge of filter element 2 and the inner ring wall of the connecting cavity 14. The fluid medium needs to pass through filter element 2 to flow to connector outlet 121, which can prevent impurities from flowing directly from the gap between the edge of filter element 2 and the inner ring wall of the connecting cavity 14 to connector outlet 121, thereby improving the filtration effect of filter element 2.

[0032] The flow direction of the fluid medium through the filter element 2 is the same as the direction of the clamping force. When the fluid medium flows, it can apply a thrust to the filter element 2 in the same direction as the clamping force. This helps the edge of the filter element 2 to maintain a tight seal with the inner ring wall of the connecting cavity 14, reducing the risk of the filter element 2 shaking due to the impact of the fluid medium. It can effectively prevent impurities from flowing directly from the gap between the edge of the filter element 2 and the inner ring wall of the connecting cavity 14 to the connector outlet 121, thereby ensuring the filtration effect of the filter element 2.

[0033] Among them, elastic element 3 can be a compression spring, see reference. Figure 3As shown, the connector inlet 111 of the pipe connector 10 can be used to connect to the supply pipe 201 of the hydrogen storage device 20 in the fuel cell system 100, and the connector outlet 121 can be used to connect to the fuel cell 30 of the fuel cell system 100. The hydrogen storage device 20 is suitable for supplying hydrogen to the fuel cell 30. The filter element 2 of the pipe connector 10 can be used to filter hydrogen to remove impurities, thereby cleaning the hydrogen. This is beneficial to improving the working efficiency of the fuel cell 30 and preventing impurities from flowing into the fuel cell 30, thus protecting the hydrogen injection and stack of the fuel cell 30 and improving the reliability and lifespan of the fuel cell 30.

[0034] According to the embodiment of the present utility model, the pipe connector 10 has a filter element 2 for filtering the fluid medium flowing through the connecting cavity 14. It can filter out impurities that flow along with the fluid medium, thereby cleaning the fluid medium. The elastic element 3 inside the pipe connector 10 can apply a clamping force to the filter element 2 so that the edge of the filter element 2 abuts and seals against the inner ring wall of the connecting cavity 14. This can effectively prevent impurities from flowing directly to the connector outlet 121, which is beneficial to ensuring the filtration effect of the filter element 2.

[0035] In some embodiments of this utility model, reference is made to Figure 1 As shown, the inner ring wall of the connecting cavity 14 has an annular centering surface 141 whose inner diameter gradually decreases in the direction away from the connector inlet 111, and the edge of the filter element 2 abuts and seals against the annular centering surface 141.

[0036] Understandably, the inner radial direction of the annular centering surface 141 gradually decreases away from the connector inlet 111. The annular centering surface 141 is constructed as a conical surface, which can realize the automatic centering of the filter element 2, reduce the positioning requirements of the filter element 2, help reduce the assembly difficulty of the pipeline connector 10, and prevent the filter element 2 from tilting. It also helps the edge of the filter element 2 to maintain abutment and seal with the inner annular wall of the connecting cavity 14, thereby ensuring the filtration effect of the filter element 2. In addition, it also helps the edge of the filter element 2 to be evenly stressed, which can avoid excessive local stress on the edge of the filter element 2 and deformation, thus helping to improve the service life of the filter element 2.

[0037] In some embodiments of this utility model, reference is made to Figure 1 As shown, the filter element 2 includes a mesh cylinder 21 and a mesh plate 22. The edge of the end of the mesh cylinder 21 away from the connector inlet 111 is sealed to the inner ring wall of the connecting cavity 14. The end of the mesh cylinder 21 near the connector inlet 111 is connected to the mesh plate 22. The elastic element 3 abuts against the mesh plate 22.

[0038] It is understandable that both the mesh cylinder 21 and the mesh plate 22 can filter fluid media, which is beneficial to increasing the flow area. While filtering the fluid media flowing through the connecting cavity 14, the flow rate of the fluid media can be ensured. Furthermore, the elastic element 3 abuts against the mesh plate 22, and the mesh plate 22 is constructed as a flat plate structure. The connection between the two is stable and reliable, which is beneficial to the elastic element 3 applying a stable and reliable clamping force to the filter element 2.

[0039] Both the mesh cylinder 21 and the mesh plate 22 can be provided with multiple mesh holes, which allow the fluid medium to flow through and block impurities, thereby realizing the filtration function of the filter element 2.

[0040] In some embodiments of this utility model, the filter element 2 is made of stainless steel. Stainless steel has good corrosion resistance, which can reduce the risk of the filter element 2 being corroded. In addition, stainless steel has good structural strength. When the filter element 2 is subjected to the fluid pressure of the fluid medium and the clamping force applied by the elastic element 3, the risk of the filter element 2 being deformed can be reduced, which is conducive to ensuring the long-term use of the filter element 2.

[0041] In some embodiments of this utility model, reference is made to Figure 1 As shown, the opening directions of the connector inlet 111 and the connector outlet 121 are different. The pipe connector 10 is constructed as an angle connector, which is beneficial for adapting to the layout of the hydrogen storage device 20 and the fuel cell 30, so that the pipe connector 10 can be connected to the hydrogen storage device 20 and the fuel cell 30.

[0042] In some embodiments of this utility model, reference is made to Figure 1 As shown, the connecting cavity 14 includes a first connecting section 142 and a second connecting section 143. The connector inlet 111, the first connecting section 142, the second connecting section 143 and the connector outlet 121 are connected in sequence. The first connecting section 142 and the second connecting section 143 extend in different directions, which is beneficial for adapting to the layout of the hydrogen storage device 20 and the fuel cell 30.

[0043] In some embodiments of this utility model, reference is made to Figure 1 As shown, the housing assembly 1 includes: a first housing 11, a second housing 12, and a housing connector 13. The first housing 11 has a connector inlet 111, and the second housing 12 has a connector outlet 121. The second housing 12 and the first housing 11 are mated together and jointly define a communicating cavity 14. The housing connector 13 is sleeved on the outside of the first housing 11 and the second housing 12. One of the first housing 11 and the second housing 12 is threadedly engaged with the housing connector 13, and the other of the two is limitedly engaged with the housing connector 13 to connect the first housing 11 and the second housing 12 together. The connection method is simple and facilitates the assembly and disassembly of the housing assembly 1.

[0044] Reference Figure 1As shown, the housing connector 13 may include a sleeve 131 and a limiting ring 132. The limiting ring 132 is connected to the radial inner side of the sleeve 131. The sleeve 131 is sleeved on the outer side of the first housing 11 and the second housing 12. The inner sidewall of the sleeve 131 has an internal thread, which is suitable for thread engagement with the external thread of the end of the second housing 12 away from the connector outlet 121. The limiting ring 132 is suitable for abutting against the first housing 11 to stop and limit the first housing 11, thereby realizing the limiting engagement between the housing connector 13 and the first housing 11, which can effectively prevent the first housing 11 from separating from the second housing 12.

[0045] Specifically, when assembling the housing assembly 1, the housing connector 13 can be rotated clockwise to make the housing connector 13 threadedly engage with the second housing 12 and the limiting ring 132 abut against the first housing 11, thereby fixing the first housing 11 and the second housing 12 together and assembling the housing assembly 1. When disassembling the housing assembly 1, the housing connector 13 can be rotated counterclockwise to separate the housing connector 13 from the second housing 12 and the limiting ring 132 from the first housing 11, thereby disassembling the housing assembly 1. The disassembly and assembly of the housing assembly 1 is simple and easy to implement, and the housing assembly 1 is detachable, which facilitates the cleaning of impurities filtered out by the filter element 2 in the connecting cavity 14, thereby facilitating the cleaning and maintenance of the pipeline joint 10.

[0046] In some embodiments of this utility model, reference is made to Figure 1 As shown, the housing assembly 1 further includes a sealing gasket 15, which is sandwiched at the mating point of the first housing 11 and the second housing 12 to fill the gap between the first housing 11 and the second housing 12, thereby achieving a seal at the mating point and effectively preventing leakage of the fluid medium within the communicating cavity 14. The sealing gasket 15 can be a copper gasket, which helps ensure the sealing performance of the first housing 11 and the second housing 12 at the mating point.

[0047] In some embodiments of this utility model, reference is made to Figure 1 and Figure 2 As shown, the housing assembly 1 also includes a limiting piece 16 and a locking nut 17. The locking nut 17 is sleeved on the outside of the second housing 12 and threadedly engaged with the second housing 12. The limiting piece 16 is located on the side of the locking nut 17 near the connector outlet 121. The locking nut 17 is used to adjust the distance between the limiting piece 16 and the connector outlet 121, and can be used to fix and lock the pipe connector 10 after it is installed.

[0048] Understandably, the second housing 12 has an external thread at one end of the connector outlet 121. This external thread can be an SAE thread, suitable for thread engagement with the fuel cell 30. The connector inlet 111 of the first housing 11 is suitable for connection to the supply line 201 of the hydrogen storage device 20. When connecting the fuel cell 30 and the hydrogen storage device 20 via the pipe connector 10, the pipe connector 10 can be screwed onto the fuel cell 30 first, and then the supply line 201 can be connected to the connector inlet 111. During the process of screwing the pipe connector 10 onto the fuel cell 30, the connector inlet 111... The opening direction changes in real time. The opening direction of the connector inlet 111 can be adjusted to be opposite to the outlet of the supply line 201, which can shorten the distance between the opening of the connector inlet 111 and the outlet of the supply line 201, so that the supply line 201 can be connected to the connector inlet 111. Then, the locking nut 17 can be turned to adjust the distance between the limiting plate 16 and the connector outlet 121. When the limiting plate 16 is adjusted to abut against the fuel cell 30, it can restrict the rotation of the pipeline connector 10, so as to fix and lock the pipeline connector 10, which is conducive to the pipeline connector 10 being firmly installed on the fuel cell 30.

[0049] Reference Figures 1-3 As shown, a fuel cell system 100 according to another embodiment of the present invention includes: a hydrogen storage device 20, a fuel cell 30 and a pipeline connector 10 as described in the above embodiment. The hydrogen storage device 20 is connected to the connector inlet 111, and the fuel cell 30 is connected to the connector outlet 121.

[0050] According to the embodiment of the present invention, the filter element 2 in the pipeline connector 10 of the fuel cell system 100 can be used to filter the hydrogen supplied by the hydrogen storage device 20 to the fuel cell 30, so as to clean the hydrogen and improve the working efficiency of the fuel cell 30. The elastic element 3 in the pipeline connector 10 can apply a clamping force to the filter element 2 so that the edge of the filter element 2 abuts and seals with the inner ring wall of the connecting cavity 14, which can effectively prevent impurities from flowing into the fuel cell 30 and achieve the purpose of protecting the hydrogen injection and stack of the fuel cell 30.

[0051] In some embodiments of this utility model, reference is made to Figure 1 As shown in the figure, the arrow indicates the direction of hydrogen flow. The pressure reducer of the hydrogen storage device 20 reduces the pressure of the hydrogen to the pressure value required by the fuel cell 30. The hydrogen enters the pipeline connector 10 from the connector inlet 111. The filter element 2 can filter out the impurities that are not filtered clean at the front end of the hydrogen storage device 20 and the impurities remaining in the supply pipeline 201. The clean hydrogen enters the hydrogen injection of the fuel cell 30 from the connector outlet 121, which can effectively improve the working efficiency of the fuel cell 30 and improve the reliability and life of the fuel cell 30.

[0052] In this embodiment, the filter element 2 of the pipe connector 10 is integrated into the housing assembly 1. Utilizing the internal space of the housing assembly 1, the overall structure of the pipe connector 10 is compact, reducing its external dimensions and saving space. This not only meets the requirements for hydrogen filtration but also greatly optimizes the installation space of the supply pipeline 201. Furthermore, it reduces the risk of hydrogen leakage, which helps ensure the airtightness and safety of the fuel cell system 100. At the same time, the opening direction of the connector inlet 111 of the pipe connector 10 can be flexibly adjusted according to the outlet direction of the supply pipeline 201, facilitating the installation of the supply pipeline 201. In addition, the first housing 11 of the pipe connector 10 adopts an O-LOK connection structure, and the second housing 12 is screwed to the fuel cell 30 via SAE threads, enabling repeated disassembly and assembly of the pipe connector 10. This reduces the number of component replacements and facilitates the installation and maintenance of the pipe connector 10.

[0053] In some embodiments of this utility model, the fuel cell system 100 can be applied to vehicles. The pipeline connector 10 integrates a filtration function, which can effectively filter out impurities from the pressure reducer outlet of the hydrogen storage device 20 to the inlet of the fuel cell 30, protecting the internal structure of the fuel cell 30, such as the hydrogen injection and stack, and extending the service life of the hydrogen injection and stack. The pipeline connector 10 has a small external size and occupies little space, which facilitates the arrangement of the pipeline connector 10. Moreover, the opening direction of the connector inlet 111 of the pipeline connector 10 can be flexibly adjusted according to needs, which is convenient for installation. The structure at both ends of the pipeline connector 10 is flexible, which can be disassembled and assembled multiple times, which is convenient for disassembly, assembly and maintenance. In addition, there are fewer hydrogen leakage risk points, which helps to ensure the safety of hydrogen use in the whole vehicle. The pipeline connector 10 is lightweight, which helps to achieve vehicle weight reduction.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0055] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pipe joint, characterized in that The shell assembly (1) has a communication cavity (14) and a joint inlet (111) and a joint outlet (121) communicating with the communication cavity (14). The filter element (2) is arranged in the communication cavity (14) and is used to filter the fluid medium flowing through the communication cavity (14). The elastic member (3) is abutted between the filter element (2) and the inner end wall of the communication cavity (14) and is used to apply a pressing force to the filter element (2) in the same direction as the flow direction of the fluid medium through the filter element (2) so that the edge of the filter element (2) is abutted and sealed with the inner annular wall of the communication cavity (14). The inner annular wall of the communication cavity (14) has an annular centering surface (141) with a gradually decreasing inner diameter away from the joint inlet (111), and the edge of the filter element (2) is abutted and sealed with the annular centering surface (141).

2. The pipe joint of claim 1, wherein, The filter element (2) comprises:

3. The pipe joint of claim 1, wherein, The mesh cylinder (21) has an edge at one end away from the joint inlet (111) abutted and sealed with the inner annular wall of the communication cavity (14); The mesh plate (22) is connected to one end of the mesh cylinder (21) close to the joint inlet (111), and the elastic member (3) is abutted with the mesh plate (22). The filter element (2) is a stainless steel member.

4. The pipe joint of claim 1, wherein, The opening directions of the joint inlet (111) and the joint outlet (121) are different.

5. The pipe joint of claim 1, wherein, The communication cavity (14) comprises a first communication section (142) and a second communication section (143), the joint inlet (111), the first communication section (142), the second communication section (143) and the joint outlet (121) are sequentially communicated, and the extension directions of the first communication section (142) and the second communication section (143) are different.

6. The pipe joint of claim 5, wherein, The shell assembly (1) comprises:

7. A pipe joint according to any one of claims 1-6, characterised in that The first shell (11) has the joint inlet (111); The second shell (12) has the joint outlet (121), and the second shell (12) and the first shell (11) are butted and jointly define the communication cavity (14); The shell connecting member (13) is sleeved on the outer sides of the first shell (11) and the second shell (12), one of the first shell (11) and the second shell (12) is threadedly connected with the shell connecting member (13), and the other is limitingly connected with the shell connecting member (13). The shell assembly (1) further comprises a sealing gasket (15) clamped at the butted place of the first shell (11) and the second shell (12).

8. The pipe joint of claim 7, wherein, ​ 9. The pipe joint of claim 7, wherein, The shell assembly (1) further comprises a limiting piece (16) and a locking nut (17), the locking nut (17) is sleeved on the outside of the second shell (12) and is in threaded cooperation with the second shell (12), the limiting piece (16) is located on the side of the locking nut (17) close to the joint outlet (121), and the locking nut (17) is used for adjusting the distance between the limiting piece (16) and the joint outlet (121).

10. A fuel cell system characterized by comprising: Comprising: A hydrogen storage device (20), a fuel cell (30) and the pipe joint according to any one of claims 1-9, the hydrogen storage device (20) is connected with the joint inlet (111), and the fuel cell (30) is connected with the joint outlet (121).

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