Airtightness Test Interface Component and Sealing Method

Abstract

The present application provides an airtightness test interface component and a sealing method. The interface component includes: a base which is inserted into the orifice of the pipeline of the fuel cell system, and the base and the orifice are in interference fit through anti-slip threads; a sealing rod which can be in threaded fit with the base, and the rod through-hole in the sealing rod can communicate with the seat through-hole of the base; a sleeve which is located between the base and the sealing rod; a sealing ring which is located between the base and the sleeve; and an O-ring which is located between the sleeve and the sealing rod. An annular step surface is provided on the side wall of the base for partially accommodating the sealing ring and the sleeve. The interface component can not only ensure the gas passage but also ensure the sealed connection, and has a simple structure, is easy to load and unload, and is beneficial to efficiently performing the airtightness test.

Description

Technical Field

[0001] The present invention relates to the field of airtightness detection, and particularly to an airtightness test interface assembly and a sealing method. Background Art

[0002] A fuel cell is a chemical device that directly converts the chemical energy of a fuel into electrical energy. Fuel cell power generation is listed among the four major power generation technologies together with hydraulic power generation, thermal power generation, and nuclear power generation. Since a fuel cell converts the Gibbs free energy part of the chemical energy of a fuel into electrical energy through an electrochemical reaction and is not restricted by the Carnot cycle effect, it has high efficiency. In addition, a fuel cell uses fuel and oxygen as raw materials and does not use mechanical transmission components, so there is no noise pollution and the emission of toxic and harmful gases is small.

[0003] A fuel cell generates electricity by using a hydrogen-oxygen reaction. The characteristics of hydrogen itself, such as leakiness, diffusivity, and explosiveness, pose certain safety hazards to the fuel cell. To ensure the safe use of a fuel cell, an airtightness test needs to be carried out on the fuel cell.

[0004] An airtightness test requires an interface assembly to connect a fuel cell system and an airtightness test device, which not only needs to ensure a gas passage but also a sealed connection. The airtightness test interface assembly in the prior art has a complex structure, is not easy to disassemble and assemble, and is not conducive to efficiently carrying out an airtightness test. Summary of the Invention

[0005] In view of the above problems in the prior art, the present application proposes an airtightness test interface assembly and a sealing method. This interface assembly can not only ensure a gas passage but also a sealed connection, and has a simple structure, is easy to load and unload, and is conducive to efficiently carrying out an airtightness test.

[0006] In a first aspect, the present invention provides an airtightness test interface assembly, which includes: a base that is inserted into the pipe orifice of a pipeline of a fuel cell system, and the base is in interference fit with the pipe orifice through anti-slip threads; a sealing rod that can be in threaded fit with the base, and a rod through-hole in the sealing rod can communicate with a seat through-hole of the base; a sleeve located between the base and the sealing rod; a sealing ring located between the base and the sleeve; and an O-ring located between the sleeve and the sealing rod. By using this interface assembly, it is possible to ensure both a gas passage and a sealed connection, and it has a simple structure, is easy to load and unload, and is conducive to efficiently carrying out an airtightness test.

[0007] In an embodiment of the first aspect, an annular stepped surface is provided on the side wall of the base for partially accommodating the sealing ring and the sleeve. Through this embodiment, it is beneficial to the arrangement of the sealing ring and the sleeve.

[0008] In an embodiment of the first aspect, the sealing ring protrudes from the side wall of the base. Through this embodiment, it is beneficial to improve the sealing performance of the interface assembly.

[0009] In an embodiment of the first aspect, the rod through-hole is opened in the middle of the sealing rod, the seat through-hole is opened in the middle of the base, and the apertures of the rod through-hole and the seat through-hole are equal. Through this embodiment, it is beneficial for production and processing, and also beneficial for the sealed connection between the rod through-hole and the seat through-hole.

[0010] In an embodiment of the first aspect, a first external thread is provided on the first end of the sealing rod away from the base for threaded connection with the airtightness testing device; a second external thread is provided on the second end of the sealing rod close to the base. Through this embodiment, the sealing rod can penetrate into the base, so as to apply axial pressure to the sealing ring through the O-ring and the sleeve, causing the sealing ring to expand radially.

[0011] In an embodiment of the first aspect, a groove is opened in the middle of the base for partially accommodating the sealing rod, and an internal thread matching the second external thread is provided on the inner wall of the groove. Through this embodiment, the setting of the groove is beneficial to avoid the tilting of the sealing rod and also beneficial to guiding the sealing rod to be smoothly inserted into the base.

[0012] In an embodiment of the first aspect, the second external thread is a reverse thread. Through this embodiment, it is beneficial to ensure that when disassembling and assembling the airtightness testing device, interference with the engagement between the second external thread and the internal thread on the inner wall of the groove is avoided, thereby avoiding gas leakage.

[0013] In an embodiment of the first aspect, the sealing rod includes an integrally formed main body and a ring portion. The ring portion is sleeved outside the main body. The inner circumference of the bottom surface of the ring portion is in contact with the groove of the base, the outer circumference of the bottom surface of the ring portion is in contact with the O-ring, and the other side of the O-ring is in contact with the sleeve. Through this embodiment, the ring portion of the sealing rod is used to press the sleeve, and the main body is used for threaded connection with the base, so as to realize the extrusion deformation of the sealing ring, which is beneficial to improving the sealing performance of the interface assembly.

[0014] In an embodiment of the first aspect, the bottom surface of the ring portion is an inclined surface. Through this embodiment, it is beneficial to reduce the total weight of the sealing rod and beneficial to the light weight of the interface assembly.

[0015] In an embodiment of the first aspect, the middle part of the main body is prism-shaped. Through this embodiment, the middle part of the main body being prism-shaped can better cooperate with the wrench, which is beneficial to applying force for sealing better.

[0016] Second aspect, the present invention also provides a sealing method using the airtightness test interface component of the first aspect and any of its embodiments. The sealing method includes the following steps: threadedly connecting the base with the pipe orifice; sleeving the sealing ring on the base; placing the sleeve on the sealing ring; placing the O-ring on the sleeve; inserting the sealing rod into the base and rotating the sealing rod to make the sealing rod threadedly engage with the base; the sealing ring is deformed by the extrusion of the sleeve to seal the pipe orifice; wherein, during the process of rotating the sealing rod, the O-ring absorbs the circumferential displacement of the sealing rod to make the sleeve move axially. Using this sealing method is beneficial to ensure a sealed connection; and the interface component can both ensure the gas passage and the sealed connection, with a simple structure, easy to load and unload, which is beneficial to efficiently perform the airtightness test.

[0017] In an embodiment of the second aspect, sleeving the sealing ring on the base means sleeving the sealing ring on the annular step surface of the base and the sealing ring protrudes from the side wall of the base. Through this embodiment, it is beneficial to improve the sealing performance of the interface component.

[0018] The airtightness test interface component and sealing method provided by this application have the following beneficial effects compared with the prior art.

[0019] 1. The interface component provided by the present invention can ensure the gas passage and the sealed connection, and has a simple structure, easy to load and unload, which is beneficial to efficiently perform the airtightness test.

[0020] 2. The sealing ring is provided to protrude from the side wall of the base, which is beneficial to improve the sealing performance of the interface component.

[0021] 3. The sealing rod includes an integrally formed main body and a ring part. The ring part of the sealing rod is used to press on the sleeve, and the main body is used to threadedly connect with the base, thereby realizing the extrusion deformation of the sealing ring, which is beneficial to improve the sealing performance of the interface component.

[0022] The above technical features can be combined in various suitable ways or replaced by equivalent technical features as long as the purpose of the present invention can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Hereinafter, the present invention will be described in more detail based on embodiments and with reference to the drawings, wherein:

[0024] Figure 1 Shows an exploded view of the interface component according to an embodiment of the present invention;

[0025] Figure 2 Shows a three-dimensional structural schematic diagram of the interface component according to an embodiment of the present invention;

[0026] Figure 3 Shows a cross-sectional view of the interface component according to an embodiment of the present invention;

[0027] Figure 4 Shows a front view of an interface component according to an embodiment of the present invention.

[0028] List of reference numerals:

[0029] 1 - Base; 2 - Sealing rod; 3 - Sleeve; 4 - Sealing ring; 5 - O-ring; 11 - Annular stepped surface; 12 - Seat through-hole; 15 - Groove; 21 - Rod through-hole; 22 - Main body; 23 - Ring portion.

[0030] In the drawings, like parts are denoted by like reference numerals. The drawings are not drawn to actual scale. Detailed embodiments

[0031] The present invention will be further described below in conjunction with the drawings.

[0032] As Figures 1 to 4 shown, this embodiment provides an airtightness test interface component, which includes: a base 1 that is inserted into the nozzle of the pipeline of the fuel cell system, and the base 1 and the nozzle are in interference fit through anti-slip threads; a sealing rod 2 that can be threadedly engaged with the base 1, and the rod through-hole 21 in the sealing rod 2 can communicate with the seat through-hole 12 of the base 1; a sleeve 3 that is located between the base 1 and the sealing rod 2; a sealing ring 4 that is located between the base 1 and the sleeve 3; and an O-ring 5 that is located between the sleeve 3 and the sealing rod 2.

[0033] This interface component is used to connect the fuel cell system and the airtightness test equipment, and ensure the gas passage and sealed connection between the fuel cell system and the airtightness test equipment, so that the airtightness test equipment can detect the airtightness of the fuel cell system and ensure that the gas will not leak to the outside through the interface component.

[0034] The base 1 and the nozzle are in interference fit through anti-slip threads; the external thread at the end of the sealing rod 2 away from the base 1 is used to connect with the airtightness test equipment, thereby connecting the fuel cell system and the airtightness test equipment.

[0035] The base 1 and the nozzle of the pipeline of the fuel cell system are in interference fit through anti-slip threads, and the interference fit is beneficial to ensuring airtightness.

[0036] The external thread at the end of the sealing rod 2 away from the base 1 is threadedly connected to the airtightness test equipment, and the threaded connection is beneficial to ensuring airtightness. Preferably, the external thread at the end of the sealing rod 2 away from the base 1 and the corresponding internal thread on the airtightness test equipment can adopt sealed pipe threads to further ensure airtightness.

[0037] To further ensure the airtightness of the interface component, the sealing ring 4 is arranged above the anti-slip pattern of the base 1 and can be in contact with the inner wall of the pipe orifice of the fuel cell system. When the sealing ring 4 is axially extruded by the sealing rod 2 and deforms, it expands radially, so as to be in pressure contact with the inner wall of the pipe orifice. The greater the radial deformation, the greater the extrusion force between the sealing ring 4 and the inner wall of the pipe orifice, and the better the sealing effect.

[0038] To enable the sealing ring 4 to be axially extruded, a sleeve 3 is arranged on the sealing ring 4, and an O-ring 5 is arranged on the sleeve 3. The other side of the O-ring 5 is in contact with the sealing rod 2. The sealing rod 2 is threadedly connected to the base 1. Thus, when the sealing rod 2 is rotated to penetrate into the base 1, the sealing rod 2 applies axial and circumferential forces to the O-ring 5. The O-ring 5 absorbs the circumferential displacement and moves axially, causing the sleeve 3 to move axially. The axial movement of the sleeve 3 causes the sealing ring 4 to expand and deform radially under the axial pressure, so as to conduct sealing.

[0039] Preferably, the external thread of the connection between the sealing rod 2 and the base 1 and the corresponding internal thread on the base 1 can adopt a sealed pipe thread to ensure airtightness.

[0040] Meanwhile, since the interface component has a small number of components and a simple structure, it is easy to load and unload, which is conducive to efficiently conducting airtightness tests.

[0041] The rod through-hole 21 and the through-hole of the base 1 communicate with each other, which is conducive to ensuring the gas passage between the fuel cell system and the airtightness test equipment.

[0042] Preferably, the base 1, the sleeve 3, the O-ring 5 and the sealing rod 2 are all made of metal materials, and the sealing ring 4 is made of rubber materials.

[0043] The interface component of this embodiment can both ensure the gas passage and ensure the sealed connection, and has a simple structure and is easy to load and unload, which is conducive to efficiently conducting airtightness tests.

[0044] In one embodiment, as Figure 1 shown, an annular stepped surface 11 is formed on the side wall of the base 1 for partially accommodating the sealing ring 4 and the sleeve 3.

[0045] The setting of the annular stepped surface 11 in this embodiment is conducive to the arrangement of the sealing ring 4 and the sleeve 3.

[0046] In one embodiment, as Figures 1 to 4 shown, the sealing ring 4 protrudes from the side wall of the base 1.

[0047] The sealing ring 4 protruding from the side wall of the base 1 enables it to be in better pressure contact with the inner wall of the pipe orifice after being axially extruded and radially expanded, which is conducive to improving the sealing performance of the interface component.

[0048] This embodiment is conducive to improving the sealing performance of the interface component.

[0049] In one embodiment, as Figure 3 shown, the rod through-hole 21 is opened in the middle of the sealing rod 2, the seat through-hole 12 is opened in the middle of the base 1, and the diameters of the rod through-hole 21 and the seat through-hole 12 are equal.

[0050] In this embodiment, the rod through-hole 21 is opened in the middle of the sealing rod 2, and the seat through-hole 12 is opened in the middle of the base 1, which is conducive to production and processing. The equal diameters of the rod through-hole 21 and the seat through-hole 12 are conducive to the sealed connection between the rod through-hole 21 and the seat through-hole 12.

[0051] In one embodiment, as Figure 1 shown, a first external thread is provided on the first end of the sealing rod 2 away from the base 1 for threaded connection with the airtightness testing device; a second external thread is provided on the second end of the sealing rod 2 close to the base 1.

[0052] Preferably, the first external thread is a sealed pipe thread to further ensure airtightness.

[0053] Preferably, the second external thread is a sealed pipe thread to further ensure airtightness.

[0054] Through the second external thread, the sealing rod 2 can penetrate into the base 1, so as to apply an axial pressure to the sealing ring 4 through the O-ring 5 and the sleeve 3, causing the sealing ring 4 to expand radially.

[0055] In this embodiment, by providing the second external thread, the sealing rod 2 can penetrate into the base 1, so as to apply an axial pressure to the sealing ring 4 through the O-ring 5 and the sleeve 3, causing the sealing ring 4 to expand radially.

[0056] In one embodiment, as Figure 3 shown, a groove 15 is opened in the middle of the base 1 for partially accommodating the sealing rod 2, and an internal thread matching the second external thread is provided on the inner wall of the groove 15.

[0057] Preferably, the internal thread provided on the inner wall of the groove 15 and matching the second external thread is a pipe thread to further ensure airtightness.

[0058] The provision of the groove 15 is conducive to the fixation of the sealing rod 2, avoiding the tilting of the sealing rod 2; and is conducive to guiding the sealing rod 2 to be smoothly inserted into the base 1.

[0059] In this embodiment, the groove 15 is conducive to avoiding the tilting of the sealing rod 2 and is also conducive to guiding the sealing rod 2 to be smoothly inserted into the base 1.

[0060] In one embodiment, the second external thread is a reverse thread.

[0061] This embodiment is conducive to ensuring that when disassembling and assembling the airtightness testing equipment, interference with the engagement between the second external thread and the internal thread on the inner wall of the groove 15 is avoided, thereby preventing gas leakage.

[0062] In one embodiment, as Figure 1 shown, the sealing rod 2 includes an integrally formed main body 22 and a ring portion 23. The ring portion 23 is sleeved on the outside of the main body 22. The inner circumference of the bottom surface of the ring portion 23 is in contact with the groove 15 of the base 1, the outer circumference of the bottom surface of the ring portion 23 is in contact with the O-ring 5, and the other side of the O-ring 5 is in contact with the sleeve 3.

[0063] In this embodiment, the ring portion 23 of the sealing rod 2 is used to press on the sleeve 3, and the main body 22 is used to be threadedly connected to the base 1, thereby realizing the extrusion deformation of the sealing ring 4, which is conducive to improving the sealing performance of the interface assembly.

[0064] In one embodiment, as Figure 1 and Figure 3 shown, the bottom surface of the ring portion 23 is an inclined surface.

[0065] This embodiment is conducive to reducing the total weight of the sealing rod 2 and facilitating the lightweight of the interface assembly.

[0066] In one embodiment, as Figure 2 shown, the middle part of the main body 22 is prismatic.

[0067] The middle part of the main body 22 being prismatic in this embodiment can better cooperate with a wrench, which is conducive to better applying force for sealing.

[0068] This embodiment also provides a sealing method using the above-mentioned airtightness testing interface assembly. The sealing method includes the following steps: making the base 1 have an interference fit with the pipe orifice; sleeving the sealing ring 4 on the base 1; placing the sleeve 3 on the sealing ring 4; placing the O-ring 5 on the sleeve 3; inserting the sealing rod 2 into the base 1 and rotating the sealing rod 2 to make the sealing rod 2 in threaded cooperation with the base 1; the sealing ring 4 is extruded and deformed by the sleeve 3 to seal the pipe orifice; wherein, during the process of rotating the sealing rod 2, the O-ring 5 absorbs the circumferential displacement of the sealing rod 2 to cause the axial movement of the sleeve 3.

[0069] To further ensure the airtightness of the interface assembly, the sealing ring 4 is arranged above the anti-slip pattern of the base 1 and can be in contact with the inner wall of the pipe orifice of the pipeline of the fuel cell system. When the sealing ring 4 is axially extruded by the sealing rod 2 to generate deformation, it expands radially, thereby making a pressurized contact with the inner wall of the pipe orifice. The greater the radial deformation, the greater the extrusion force between the sealing ring 4 and the inner wall of the pipe orifice, and the better the sealing effect.

[0070] To axially compress the sealing ring 4, a sleeve 3 is provided on the sealing ring 4, and an O-ring 5 is provided on the sleeve 3. The other side of the O-ring 5 contacts the sealing rod 2. The sealing rod 2 is threadedly connected to the base 1. Thus, when the sealing rod 2 is rotated to penetrate into the base 1, the sealing rod 2 applies axial and circumferential forces to the O-ring 5. The O-ring 5 absorbs the circumferential displacement and moves axially, causing the sleeve 3 to move axially. The axial movement of the sleeve 3 causes the sealing ring 4 to radially expand and deform under axial pressure, thereby achieving sealing.

[0071] Meanwhile, the rod through-hole 21 and the through-hole of the base 1 are mutually penetrated, which is beneficial to ensuring the gas passage between the fuel cell system and the airtightness test equipment.

[0072] The sealing method of this embodiment has good airtightness, which is beneficial to ensuring the sealed connection. Moreover, the interface assembly can not only ensure the gas passage but also ensure the sealed connection, has a simple structure, is easy to install and disassemble, and is beneficial to efficiently performing the airtightness test.

[0073] In one embodiment, sleeving the sealing ring 4 on the base 1 means sleeving the sealing ring 4 on the annular step surface 11 of the base 1 and the sealing ring 4 protrudes from the side wall of the base 1.

[0074] The sealing ring 4 is provided to protrude from the side wall of the base 1, so that after the sealing ring 4 is axially compressed and radially expands, it can better press-contact the inner wall of the pipe orifice, which is beneficial to improving the sealing performance of the interface assembly.

[0075] This embodiment is beneficial to improving the sealing performance of the interface assembly.

[0076] Embodiment 1

[0077] This embodiment provides an airtightness test interface assembly, which includes: a base 1, which is inserted into the pipe orifice of the pipeline of the fuel cell system, and the base 1 and the pipe orifice are in interference fit through anti-slip threads; a sealing rod 2, which can be in threaded cooperation with the base 1, and the rod through-hole 21 in the sealing rod 2 can be communicated with the seat through-hole 12 of the base 1; a sleeve 3, which is located between the base 1 and the sealing rod 2; a sealing ring 4, which is located between the base 1 and the sleeve 3; and an O-ring 5, which is located between the sleeve 3 and the sealing rod 2.

[0078] This interface assembly is used to connect the fuel cell system and the airtightness test equipment, and ensure the gas passage and sealed connection between the fuel cell system and the airtightness test equipment, so that the airtightness test equipment can detect the airtightness of the fuel cell system and ensure that the gas will not leak to the outside through the interface assembly.

[0079] The base 1 and the pipe orifice are in interference fit through anti-slip threads; the external thread at one end of the sealing rod 2 away from the base 1 is used to connect with the airtightness test equipment, thereby connecting the fuel cell system and the airtightness test equipment.

[0080] The base 1 and the pipe orifice of the pipeline of the fuel cell system are in interference fit through anti-slip threads, and the interference fit is beneficial to ensuring airtightness.

[0081] The external thread at one end of the sealing rod 2 away from the base 1 is threadedly connected to the airtightness testing equipment, and the threaded connection is beneficial to ensuring airtightness. Preferably, the external thread at one end of the sealing rod 2 away from the base 1 and the corresponding internal thread on the airtightness testing equipment can adopt sealed pipe threads to further ensure airtightness.

[0082] In order to further ensure the airtightness of the interface assembly, the sealing ring 4 is arranged above the anti-slip threads of the base 1 and can contact the inner wall of the pipe orifice of the fuel cell system. When the sealing ring 4 is axially extruded and deformed, it expands radially, so as to be in pressure contact with the inner wall of the pipe orifice. The greater the radial deformation, the greater the extrusion force between the sealing ring 4 and the inner wall of the pipe orifice, and the better the sealing effect.

[0083] In order to axially extrude the sealing ring 4, a sleeve 3 is arranged on the sealing ring 4, and an O-ring 5 is arranged on the sleeve 3. The other side of the O-ring 5 contacts the sealing rod 2. The sealing rod 2 is threadedly connected to the base 1. Thus, when the sealing rod 2 is rotated to penetrate into the base 1, the sealing rod 2 applies axial and circumferential forces to the O-ring 5. The O-ring 5 absorbs the circumferential displacement and moves axially, so that the sleeve 3 moves axially. The axial movement of the sleeve 3 causes the sealing ring 4 to expand and deform radially under axial pressure, so as to perform sealing.

[0084] Preferably, the external thread of the sealing rod 2 connected to the base 1 and the corresponding internal thread on the base 1 can adopt sealed pipe threads to ensure airtightness.

[0085] At the same time, since the number of components of the interface assembly is small and the structure is simple, it is easy to load and unload, which is beneficial to efficiently performing airtightness testing.

[0086] The rod through-hole 21 and the through-hole of the base 1 are mutually penetrated, which is beneficial to ensuring the gas path between the fuel cell system and the airtightness testing equipment.

[0087] Preferably, the base 1, the sleeve 3, the O-ring 5 and the sealing rod 2 are all made of metal materials, and the sealing ring 4 is made of rubber materials.

[0088] The interface assembly of this embodiment can not only ensure the gas path but also ensure the sealed connection, and has a simple structure, is easy to load and unload, and is beneficial to efficiently performing airtightness testing.

[0089] Embodiment 2

[0090] This embodiment provides a sealing method using the above airtightness test interface assembly. The sealing method includes the following steps: threadedly connecting the base 1 to the pipe orifice; sleeving the sealing ring 4 on the base 1; placing the sleeve 3 on the sealing ring 4; placing the O-ring 5 on the sleeve 3; inserting the sealing rod 2 into the base 1 and rotating the sealing rod 2 so that the sealing rod 2 is in threaded engagement with the base 1; the sealing ring 4 is deformed by extrusion of the sleeve 3 to seal the pipe orifice; wherein, during the process of rotating the sealing rod 2, the O-ring 5 absorbs the circumferential displacement of the sealing rod 2 to cause the axial movement of the sleeve 3.

[0091] The sealing ring 4 is arranged above the anti-slip pattern of the base 1 and can be in contact with the inner wall of the pipe orifice of the fuel cell system. When the sealing ring 4 is deformed by axial extrusion of the sealing rod 2, it expands radially, so as to be in pressurized contact with the inner wall of the pipe orifice. The greater the radial deformation, the greater the extrusion force between the sealing ring 4 and the inner wall of the pipe orifice, and the better the sealing effect.

[0092] In order to enable the sealing ring 4 to be axially extruded, a sleeve 3 is arranged on the sealing ring 4, and an O-ring 5 is arranged on the sleeve 3. The other side of the O-ring 5 is in contact with the sealing rod 2. The sealing rod 2 is in threaded connection with the base 1. Thus, when the sealing rod 2 is rotated to penetrate into the base 1, the sealing rod 2 applies axial and circumferential forces to the O-ring 5. The O-ring 5 absorbs the circumferential displacement and moves axially, causing the axial movement of the sleeve 3. The axial movement of the sleeve 3 causes the sealing ring 4 to expand and deform radially under the axial pressure, so as to conduct sealing.

[0093] Preferably, sleeving the sealing ring 4 on the base 1 means sleeving the sealing ring 4 on the annular step surface 11 of the base 1 and the sealing ring 4 protrudes from the side wall of the base 1.

[0094] The sealing ring 4 protruding from the side wall of the base 1 enables better pressurized contact with the inner wall of the pipe orifice after the sealing ring 4 expands radially due to axial extrusion, which is beneficial to improving the sealing performance of the interface assembly.

[0095] This embodiment is beneficial to improving the sealing performance of the interface assembly.

[0096] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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 thus should not be construed as a limitation to the present invention.

[0097] While the invention has been described herein with reference to particular embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Accordingly, it should be understood that numerous modifications may be made to the exemplary embodiments, and other arrangements may be devised, without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and the features described herein may be combined in ways different from those described in the original claims. It should also be understood that features described in connection with separate embodiments may be used in other described embodiments.

Claims

1. An airtightness test interface assembly, characterized in that, it includes: A base, which is inserted into the pipe orifice of the pipeline of the fuel cell system. The base and the pipe orifice are in interference fit through anti-slip threads. A groove is provided in the middle of the base, and internal threads are provided on the inner wall of the groove; A sealing rod, on the first end of the sealing rod away from the base, a first external thread is provided for threaded connection with the airtightness test equipment. On the second end of the sealing rod close to the base, a second external thread is provided for mating with the internal thread so that it can be threadedly mated with the base. The rod through hole in the sealing rod can communicate with the seat through hole of the base; A sleeve, which is located between the base and the sealing rod; A sealing ring, which is located between the base and the sleeve; and, An O-ring, which is located between the sleeve and the sealing rod; The sealing rod includes an integrally formed main body and a ring part. The ring part is sleeved on the outside of the main body. The inner circumference of the bottom surface of the ring part is in contact with the groove, and the outer circumference of the bottom surface of the ring part is in contact with the O-ring. The other side of the O-ring is in contact with the sleeve.

2. The airtightness test interface assembly according to claim 1, characterized in that, An annular stepped surface is provided on the side wall of the base for partially accommodating the sealing ring and the sleeve.

3. The airtightness test interface assembly according to claim 1, characterized in that, The sealing ring protrudes from the side wall of the base.

4. The airtightness test interface assembly according to claim 1, characterized in that, The rod through hole is provided in the middle of the sealing rod, the seat through hole is provided in the middle of the base, and the diameters of the rod through hole and the seat through hole are equal.

5. The airtightness test interface assembly according to claim 1, characterized in that, The second external thread is a reverse thread.

6. The airtightness test interface assembly according to claim 1, characterized in that, The bottom surface of the ring part is an inclined surface.

7. The airtightness test interface assembly according to claim 1, characterized in that, The middle part of the main body is prismatic.

8. A sealing method using the airtightness test interface assembly according to any one of claims 1 to 7, characterized in that, it includes the following steps: Making the base and the pipe orifice in interference fit; Putting the sealing ring on the base; Putting the sleeve on the sealing ring; Putting the O-ring on the sleeve; Inserting the sealing rod into the base and rotating the sealing rod to make the sealing rod threadedly mated with the base; The sealing ring is deformed by the extrusion of the sleeve to seal the pipe orifice; Wherein, during the process of rotating the sealing rod, the O-ring absorbs the circumferential displacement of the sealing rod to make the sleeve move axially.

9. The sealing method according to claim 8, characterized in that, Putting the sealing ring on the base means putting the sealing ring on the annular stepped surface of the base and the sealing ring protrudes from the side wall of the base.

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