A sealing structure and a sealing system

Abstract

The present application discloses a sealing structure and a sealing system. The sealing structure includes an annular part, which has annular sealing ends located at both axial ends and an annular middle section located between the two annular sealing ends. The annular middle section has an annular inner peripheral part and an annular outer peripheral part, and both the annular inner peripheral part and the annular outer peripheral part are ridge structures; the annular part further includes a plurality of protrusions spaced along the ridge structure, and the protrusions protrude radially from the ridge structure. The provision of the ridge structure allows for a greater deformation amount in the axial direction during the extrusion process and is not easily filled with the entire groove to cause local failure. The ridge structure can form a continuous circumferential sealing line in the circumferential direction. In addition, the protrusions play a guiding role in the pressing-in of the annular part, ensuring the consistency of the installation of the annular part in the entire circumferential area after the annular part is pressed axially into the groove, and playing a supporting role for the annular part, so that the annular part is not distorted, thereby improving the reliability of the seal.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing, and particularly relates to a sealing structure and a sealing system. Background Art

[0002] Currently, the main component used for sealing structural members is an O-ring, which has good deformation function to meet the sealing performance requirements. However, for some fluids that are extremely prone to leakage, such as hydrogen, the O-ring cannot achieve a good sealing effect. Summary of the Invention

[0003] The present application provides a sealing structure, which includes an annular part. The annular part has annular sealing ends located at both axial ends and an annular middle section located between the two annular sealing ends. The annular middle section has an annular inner peripheral part and an annular outer peripheral part, and both the annular inner peripheral part and the annular outer peripheral part are ridge structures. The annular part further includes a plurality of protrusions spaced along the ridge structure, and the protrusions protrude radially from the ridge structure.

[0004] In a specific embodiment, the sealing structure is received in a groove. The cross-section of the annular part between adjacent protrusions is a first cross-section, and the cross-section at the position of the protrusion is a second cross-section. The lengths of the first cross-section and the second cross-section are equal, and the length is greater than the groove depth. The width of the first cross-section is less than the width of the groove. The width of the second cross-section is the distance between the protrusions of the annular inner peripheral part and the protrusions of the annular outer peripheral part, and the width of the second cross-section is greater than the width of the groove.

[0005] In a specific embodiment, the ratio range of the lengths of the first cross-section and the second cross-section to the groove depth is 1.2 - 1.5; the ratio range of the width of the first cross-section to the width of the groove is 0.8 - 0.9; the ratio range of the width of the second cross-section to the width of the groove is 1.05 - 1.1.

[0006] In a specific embodiment, the cross-section of the annular part between adjacent protrusions is a first cross-section. The length of the first cross-section is greater than the width of the first cross-section, and the length direction of the first cross-section is parallel to the axial direction.

[0007] In a specific embodiment, the ratio range of the length of the first cross-section to the width of the first cross-section is 2.0 - 2.5.

[0008] In a specific embodiment, the included angle range of the ridge structure is 145° - 155°.

[0009] In a specific embodiment, the outer contour of the cross-section of the annular sealing end is an arc.

[0010] In a specific embodiment, the cross-section of the part of the annular portion between adjacent protrusions is a first cross-section, and the ratio range of the radius of the arc to the width of the first cross-section is 0.2 to 0.3.

[0011] In a specific embodiment, the ridge structure and the annular sealing end have a smooth transition.

[0012] In a specific embodiment, the sealing structure includes at least two of the annular portions, and adjacent two of the annular portions partially overlap and are joined together as a whole.

[0013] In a specific embodiment, the total circumferential length of the multiple protrusions of the annular outer peripheral portion is 10% to 15% of the total length of the annular outer peripheral portion; the total circumferential length of the multiple protrusions of the annular inner peripheral portion is 10% to 15% of the total length of the annular inner peripheral portion.

[0014] The present application also provides a sealing system, which includes a first structural member and a second structural member. The first structural member and the second structural member respectively include a first hole and a second hole that are docked, and a first sealing end face and a second sealing end face that are docked and respectively surround the first hole and the second hole. At least one of the first sealing end face and the second sealing end face is provided with a groove to accommodate the sealing structure, and the sealing structure is the sealing structure according to any one of claims 1-11.

[0015] In a specific embodiment, the sealing system further includes a channel provided in the first structural member and / or the second structural member, and the channel communicates the groove with the first hole or the second hole.

[0016] In a specific embodiment, the groove is provided in the first sealing end face. The groove divides the first sealing end face into an inner sealing end face close to the first hole and an outer sealing end face far from the first hole. The outer sealing end face is attached to the second sealing end face, and there is an annular gap between the inner sealing end face and the second sealing end face, and the annular gap forms the channel.

[0017] In a specific embodiment, the ratio range of the axial length of the annular gap to the groove depth of the groove is 0.08 to 0.12.

[0018] In a specific embodiment, the first structural member and the second structural member are provided with multiple groups of corresponding first holes and second holes, and the sealing structure includes a corresponding number of annular portions. Each annular portion correspondingly seals a group of the first holes and the second holes, and partial overlaps of adjacent annular portions are joined together as a whole.

[0019] In a specific embodiment, the sealing system is a proton exchange membrane fuel cell system. The sealing system includes three groups of the first holes and the second holes, and the sealing structure includes three corresponding annular portions. The three groups of the first holes and the second holes respectively correspond to the circulation of coolant, air, and hydrogen.

[0020] In the present application, both the annular inner peripheral portion and the annular outer peripheral portion of the annular portion of the sealing structure are ridge structures. In this way, during the extrusion process, on the one hand, it allows for a larger deformation amount in the axial direction to achieve the main sealing. On the other hand, this structure is not easily filled with the entire groove and local failure occurs, so that a continuous loop seal can be formed by the ridge structure in the circumferential direction, further ensuring the sealing effect. In addition, the annular portion in the present application is also provided with a protrusion. After being pressed into the groove, the protrusion will be extruded. The protrusion plays a guiding role in the pressing of the annular portion, ensuring the consistency of the installation of the annular portion in the entire circumferential region after the annular portion is axially pressed into the groove. At the same time, the protrusion also plays a role in supporting the annular portion, enabling the annular portion to maintain structural stability during long-term service in a high-temperature and high-pressure environment, without distortion and deformation, improving the reliability of the seal. Since the sealing structure in the present application can obtain a large compression rate in both the axial direction and the direction perpendicular to the axial direction, and will not fill the groove, and there is the supporting and guiding effect of the protrusion, the sealing structure allows the use of a rubber material with a lower Shore hardness, such as a rubber material with a Shore hardness of 40-50. Compared with the conventional O-ring with a Shore hardness of 70-80, the present application can use a softer material, so the sealing effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of a specific embodiment of the sealing system provided by the present application;

[0022] Figure 2 is Figure 1 a schematic diagram of the sealing structure in

[0023] Figure 3 is Figure 2 a schematic diagram of one of the annular portions of the sealing structure in

[0024] Figure 4 is Figure 3 a sectional view taken along the N-N direction in

[0025] Figure 5 isFigure 3 Cross-sectional view in the M-M direction;

[0026] Figure 6 is Figure 2 Partial schematic view of the sealing structure located between the first structural member and the second structural member, not yet installed in the groove, and in the axial cross-sectional view, with the cross-sectional position corresponding to the protrusion of the sealing structure;

[0027] Figure 7 is Figure 2 Partial schematic view of the sealing structure located between the first structural member and the second structural member, not yet installed in the groove, and in the axial cross-sectional view, with the cross-sectional position corresponding to the position between two adjacent protrusions of the sealing structure;

[0028] Figure 8 is Figure 6 Schematic view after the sealing structure is installed in place;

[0029] Figure 9 is Figure 7 Schematic view after the sealing structure is installed in place.

[0030] Figures 1-9 The description of the reference numerals in the figures is as follows:

[0031] 1 - First structural member; 11 - First hole; 12 - First sealing end face; 121 - Outer sealing end face; 122 - Inner sealing end face; 13 - Groove;

[0032] 2 - Second structural member; 21 - Second hole; 22 - Second sealing end face;

[0033] 3 - Sealing structure; 31 - Ring portion; 311 - Protrusion; 312 - Ring-shaped outer ridge; 3121 - Outer ridge; 313 - Ring-shaped inner ridge; 3131 - Inner ridge; 314 - Ring-shaped sealing end; 31a - Lower segment; 31b - Right segment; 31c - Left segment; 31d - Upper segment;

[0034] 4 - Connecting pipe; a - Circumferential gap. Detailed implementation manners

[0035] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0036] Please refer to Figures 1-3 , Figure 1 which is a schematic structural diagram of a specific embodiment of the sealing system provided by the present application; Figure 2 is Figure 1 a schematic diagram of the sealing structure 3 in Figure 3 is Figure 2 a schematic diagram of one of the ring portions 31 of the sealing structure 3 in

[0037] like Figure 1 As shown, the sealing system in this embodiment includes a first structural member 1 and a second structural member 2. The first structural member 1 and the second structural member 2 are both provided with hole structures, namely a first hole 11 and a second hole 21 (shown in FIG. Figure 6 ), the first structural member 1 and the second structural member 2 can both be connected with a connecting pipe 4, and the first hole 11 of the first structural member 1 and the second hole 21 of the second structural member 2 are connected, so that the fluid can flow in the first hole 11 and the second hole 21 to form a flow channel of the fluid, and the fluid can flow into the connecting pipe 4, or flow from the connecting pipe 4 into the first hole 11 and the second hole 21.

[0038] Multiple sets of corresponding first holes 11, second holes 21, and pipes 4 may be provided. Figure 1 The figure shows three groups of first holes 11, second holes 21, and connecting pipes 4. The three first holes 11 simultaneously penetrate the same end face of the first structural member 1, which is the sealing end face of the first structural member 1 and is defined as the first sealing end face 12. The three second holes 21 simultaneously penetrate the same end face of the second structural member 2 and are defined as the second sealing end face 22. The first sealing end face 12 and the second sealing end face 22 are butt-jointed and sealed by a sealing structure 3 located between the first structural member 1 and the second structural member 2.

[0039] In this embodiment, the sealing structure 3 includes three connected annular parts 31, which respectively seal the three groups of first holes 11 and second holes 21 to prevent fluid leakage from the docking position of the first holes 11 and the second holes 21. In addition, the first structural member 1 is provided with a groove 13, and the groove 13 can accommodate the sealing structure 3. The sealing structure 3 is made of a material with a certain elasticity to be pressed between the first structural member 1 and the second structural member 2. The elastic material is, for example, a rubber material, which can be EPDM rubber or fluororubber.

[0040] Please continue to refer to Figure 2 , 3 The sealing structure 3 in this embodiment includes an annular portion 31, which is arranged according to the shape of the groove 13 arranged on the first structural member 1, and the groove 13 is arranged around the first hole 11. Figure 1 In the embodiment, the first hole 11 and the corresponding groove 13 are roughly rectangular, and the annular portion 31 is also rectangular. The three first holes 11 are all rectangular, among which the first hole 11 located at the bottom is smaller in width, and the corresponding groove 13 and the corresponding annular portion 31 are relatively slender rectangles. It can be understood that according to the structural morphology changes of the first holes 11 and the grooves 13, the annular portion 31 can also be adaptively designed, such as circular, elliptical, etc., and this is not limited in the present embodiment. For the convenience of installation, the annular portions 31 corresponding to the multiple groups of first holes 11 and second holes 21 can be set as a whole, that is, two adjacent annular portions 31 can be partially overlapped to connect as a whole, such as Figure 2As shown, the entire sealing structure 3 includes three serially connected annular parts 31, such as Figure 3 As shown, the uppermost quadrilateral annular part 31 includes an upper section 31d, a lower section 31a, a left section 31c, and a right section 31b. The lower section 31a of it overlaps with the upper section of the middle annular part 31, that is, the lower section 31a of the uppermost annular part 31 is also the upper section of the middle annular part 31, and the two share this part, thus becoming an integral structure.

[0041] Please continue to combine with Figure 4 、 5 for understanding. Figure 4 It is Figure 3 the sectional view in the N-N direction in Figure 5 and is Figure 3 the sectional view in the M-M direction in

[0042] The annular part 31 surrounds to form an inner hole. Taking the axis of the inner hole as a reference, the axis can be understood by referring to Figure 4 、 5 The annular part 31 has annular sealing ends 314 located at both ends. The annular sealing ends 314 at both ends are the two ends distributed along the axis. The annular part 31 also includes an annular middle section located between the annular sealing ends 314 at both ends. The annular middle section has an annular inner peripheral part and an annular outer peripheral part. The annular inner peripheral part faces the inner hole of the annular part 31, and the annular outer peripheral part is away from the inner hole of the annular part 31. As Figure 4 shown, both the annular inner peripheral part and the annular outer peripheral part of the annular part 31 are ridge structures, defined as an annular outer ridge 312 and an annular inner ridge 313, that is, the annular inner peripheral part and the annular outer peripheral part bulge towards the middle in the direction perpendicular to the circumferential direction. Specifically, the annular inner peripheral part bulges inwards to form the annular inner ridge 313, and the annular outer peripheral part bulges outwards to form the annular outer ridge 312. The tip of the bulge forms the ridge of the ridge structure. The first ridge 3121 is located in the middle of the annular outer ridge 312, and the second ridge 3131 is located in the middle of the annular inner ridge 313. As Figure 4 shown, both the first ridge 3121 of the annular outer ridge 312 and the second ridge 313 of the annular inner ridge 313 are circular ring structures. Of course, based on the processing technology, the ridge can also be a very narrow ring surface relative to the axial length of the annular inner ridge 313 or the annular outer ridge 312.

[0043] In addition, combining with Figure 3 and Figure 5 for understanding, the annular part 31 also includes a plurality of protrusions 311 spaced apart along the annular inner ridge 313 and the annular outer ridge 312. The protrusions 311 protrude radially from the ridge structure, and the radial direction is perpendicular to the circumferential direction and the axial direction. The protrusions 311 are provided in the middle of the ridge structure, that is, the middle of the protrusions 311 also roughly corresponds to the position of the ridge.

[0044] Please continue to combine with Figures 6-7 for understanding.Figure 6 In Figure 2 Figure Figure 2 is a partial schematic view of the sealing structure 3 located between the first structural member 1 and the second structural member 2, not yet installed in the groove 13, and in the axial sectional view. The sectional position corresponds to the position of the protrusion 311 of the sealing structure 3; Figure 7 In Figure 2 Figure Figure 2 is a partial schematic view of the sealing structure 3 located between the first structural member 1 and the second structural member 2, not yet installed in the groove 13, and in the axial sectional view. The sectional position corresponds to the position between two adjacent protrusions 311 of the sealing structure 3, that is, the position without the protrusion 311 is sectioned.

[0045] As Figure 6 , 7 shown, the cross-sections of the annular portion 31 at the position of the protrusion 311 and at the position without the protrusion 311 are different. The cross-section defining the position of the protrusion 311 is defined as the first cross-section, and the cross-section between adjacent protrusions 311 is the second cross-section. The cross-section is a section of the annular portion 31 perpendicular to its circumferential direction. During installation, the two annular sealing ends 314 of the annular portion 31 face the first structural member 1 and the second structural member 2 respectively, and the protruding directions of the protrusion 311 and the ridge structure are perpendicular to the axial direction.

[0046] In addition, as Figure 7 shown, the width of the first cross-section of the annular portion 31 is L3, that is, the distance between the first ridge 3121 of the annular outer ridge 312 and the second ridge 3131 of the annular inner ridge 313 is L3, and the length of the first cross-section is H2, that is, the axial distance between the two annular sealing ends 314 on both sides is H2, and the width is the dimension perpendicular to the axial direction; as Figure 6 shown, the width of the second cross-section of the annular portion 31 is L1, that is, the distance between the protrusion 311 provided on the annular inner ridge 313 and the protrusion 311 provided on the annular outer ridge 312 is L1. Here, the protrusions 311 of the annular outer ridge 312 and the protrusions 311 of the annular inner ridge 313 are in corresponding positions, that is, a pair of protrusions 311 are respectively provided on the annular outer ridge 312 and the annular inner ridge 313 in the direction perpendicular to the circumferential direction of the annular portion 31. The length of the second cross-section is equal to that of the first cross-section, that is, the lengths of any cross-sections are equal, only the widths are different due to the presence or absence of the protrusion 311. As Figure 6 shown, the depth of the groove 13 is H1, and the width of the groove 13 is L2. In this embodiment, the width L2 of the groove 13 is greater than the width L3 of the annular portion 31 at the position without the protrusion 311, but less than the width L1 of the annular portion 31 at the position of the protrusion 311.

[0047] Combined with Figure 8 , 9 understood, Figure 8 In Figure 6 Figure Figure 6 is a schematic view of the sealing structure 3 after being installed in place;Figure 9 The Figure 7 schematic diagram after the sealing structure 3 in the

[0048] is Figure 9 installed in place. As Figure 9 shown, under the extrusion of the first sealing end face 12 of the first structural member 1 and the second sealing end face 22 of the second structural member 2, the annular portion 31 of the sealing structure 3 is received in the groove 13. The annular portion 31 is axially extruded and deformed. The length of the cross-section of the annular portion 31 will become smaller, while the width will increase. Since the width L3 of the first cross-section of the annular portion 31 before installation is smaller than the width L2 of the groove 13, a larger axial deformation amount of the annular portion 31 can be allowed to ensure that the sealing areas of the two annular sealing ends 314 and the first sealing end face 12 and the second sealing end face 22 are increased, guaranteeing the sealing effect. Figure 9 In Figure 9 the A position in the

[0049] a relatively large compression ratio can be achieved. Of course, although the width L3 of the first cross-section of the annular portion 31 is smaller than the width L2 of the groove 13, after the annular portion 31 is extruded and deformed, the width of the annular portion 31 increases, and the first ridge 3131 of the annular outer convex ridge 312 and the second ridge 3131 of the annular inner convex ridge 313 will squeeze against the two side walls of the groove 13, specifically Figure 9 the upper and lower side walls of the groove 13 from the Figure 9 viewpoint, thereby forming a line seal at the two B positions shown in

[0049] Figure 9 the

[0050] It is considered in the research that in the background art, an O-ring is used for sealing. After the O-ring is extruded into the groove, the deformation amounts around it are basically the same, and the O-ring will quickly fill the groove. However, it is very difficult to achieve the fit between the entire outer surface and the groove wall, thus it is easy to have a situation of local seal failure. Especially for gases that are very prone to leakage, this failure situation is even more obvious. In this embodiment, the annular part 31 of the sealing structure 3 is provided with an annular inner ridge 313 and an annular outer ridge 312 with a ridge structure. In this way, during the extrusion process, on the one hand, a larger deformation amount in the axial direction is allowed to achieve the main seal. On the other hand, this structure is not easy to fill the entire groove 13 and cause local failure, so that a continuous loop seal can be formed by the ridge structure in the circumferential direction, further ensuring the sealing effect. Of course, according to the material of the sealing structure 3, the above dimensions can be appropriately adjusted.

[0051] In addition, in this embodiment, the annular part 31 is further provided with a protrusion 311. The width L1 of the protrusion 311 is greater than the width L2 of the groove 13. After being pressed into the groove 13, the protrusion 311 will be extruded. The protrusion 311 plays a guiding role in the pressing of the annular part 31, ensuring the consistency of the installation of the annular part 31 in the entire circumferential area after the annular part 31 is axially pressed into the groove 13. At the same time, the protrusion 311 also plays a role in supporting the annular part 31, so that the annular part 31 can still maintain structural stability during long-term service in a high-temperature and high-pressure environment, without being distorted and deformed, improving the reliability of the seal. Specifically, the ratio range of the width L1 of the second cross-section to the width L2 of the groove 13 is 1.05 - 1.1. The guiding and supporting effects described above can be achieved within this ratio range, and it will not affect the pressing of the annular part 31 into the groove 13. In addition, as Figure 1 shown, the total length of the multiple protrusions 311 distributed along the circumference of the annular part 31 is 10% - 15% of the circumference of the annular part 31, that is, the set length of the protrusions 311 is controlled to avoid affecting the exertion of the guiding effect and not interfering with the axial compression.

[0052] Since the sealing structure 3 in this embodiment can obtain a large compression rate in both the axial direction and the direction perpendicular to the axial direction, and will not fill the groove 13, and with the supporting and guiding effects of the protrusions 311, the sealing structure 3 allows the use of a rubber material with a lower Shore hardness, such as a rubber material with a Shore hardness of 40 - 50. Compared with the conventional O-ring with a Shore hardness of 70 - 80, in this embodiment, because a softer material can be used, the sealing effect is better.

[0053] In addition, in this embodiment, the ratio range of the length H2 to the width L3 of the first cross-section can be selected as 2.0 to 2.5, that is, the axial length of the annular part 31 should be greater than twice to 2.5 times the width. This is beneficial to ensuring the axial compression amount of the annular part 31, so that the annular sealing ends 314 at both ends can exert their main sealing function. Of course, the length of the annular part 31 should not be too long to avoid problems such as torsional deformation during the extrusion process, so it is limited to less than 2.5 times.

[0054] Please continue to refer to Figure 4 , in this embodiment, the included angle θ range of the ridge structure can be selected as 145° to 155°. The included angle of the ridge structure is the included angle between the lines connecting the two ends of the ridge structure in the axial direction and the ridge back. Taking Figure 4 the annular outer ridge 312 as an example, the cross-sectional contour of the annular outer ridge 312 is triangular. The annular outer ridge 312 has a first end 3122 and a second end 3123 along the axis. The first end 3122 and the first ridge back 3121 form a first connection line, and the second end 3123 and the first ridge back 3121 form a second connection line. The included angle between the first connection line and the second connection line is the included angle θ of the above-mentioned ridge structure. The annular inner ridge 313 and the annular outer ridge 312 are axially symmetric structures, and the principle is the same. The size of the included angle θ affects the compression amount of the ridge structure in the direction perpendicular to the axial direction. The smaller the angle, the thinner and easier the ridge structure is to compress, and vice versa for a larger angle. However, the angle design of the ridge structure is related to the length H2 and width L3 of the annular part 31, and can be designed in combination with these parameters.

[0055] In addition, as Figure 4 shown, in this embodiment, the outer contour of the cross-section of the annular sealing ends 314 on both sides of the annular part 31 is an arc, which is beneficial to forming a larger contact sealing area during compression. As Figure 6 shown, the ratio range of the radius R of the arc to the width L3 of the first cross-section is 0.2 to 0.3. Similarly, this ratio affects the compression amounts in both the axial direction and the direction perpendicular to the axial direction, and can be designed in combination with the material and the actual compression amount requirements.

[0056] In this embodiment, as Figure 4 shown, the annular outer ridge 312 and the annular inner ridge 313 on the annular part 31 and the annular sealing end 314 have a smooth transition, which is beneficial to the transmission of compression deformation.

[0057] Please continue to refer to Figures 6-9, the groove 13 divides the first sealing end face 12 into an inner sealing end face 122 close to the first hole 11 and an outer sealing end face 121 far from the first hole 11. After the sealing installation, the outer sealing end face 121 fits with the second sealing end face 22, and there is an annular gap a between the inner sealing end face 122 and the second sealing end face 22. The annular gap a forms a channel, and the channel communicates with the first hole 11. With such a setting, during the extrusion of the sealing structure 3, the fluid around the sealing structure 3 can be discharged from this channel to the first hole 11, so as to prevent the sealing structure 3 from being not properly installed due to the existence of the fluid and ensure the exertion of the sealing effect. The ratio range of the axial length △H of the annular gap a to the groove depth H1 of the groove 13 can be 0.08 - 0.12. The circumferential gap a is relatively small compared to the groove depth H1 to ensure that the ridge structure and the protrusion 311 of the annular part 31 can be in full contact and sealing with the groove wall of the groove 13.

[0058] Of course, the channel is not limited to being formed by the circumferential gap a, and other methods can also be used. For example, a through hole communicating with the groove 13 can be provided on the hole wall of the first hole 11 of the first structural member 1, or a through hole can be provided on the second structural member 2. One end of the through hole penetrates the hole wall of the second hole 21, and the other end penetrates the position of the second sealing end face 22 corresponding to the groove 13, which is also possible. The groove 13 is not limited to being provided on one structural member. For example, both the first structural member 1 and the second structural member 2 are provided with grooves to jointly accommodate the annular part 31. Of course, the setting positions of the ridge structure and the protrusion 311 at this time should be considered to achieve the above purposes of improving the compression ratio and supporting to prevent deformation.

[0059] The sealing system in this embodiment can be used in a proton exchange membrane fuel cell system. The proton exchange membrane fuel cell uses hydrogen as fuel. The molecular weight of hydrogen is very small, and it is extremely easy to leak from unstable seals during long-term service in a high-temperature and high-pressure environment. The sealing system in this embodiment has strong sealing performance, so as to meet the sealing requirements of hydrogen. Specifically, in Figure 1 , the three nozzles can respectively flow coolant, air, and hydrogen.

[0060] It should be known that when the sealing structure 3 is made of rubber material and applied to a hydrogen sealing environment, hydrogen molecules are small enough to enter the rubber, resulting in the phenomenon of hydrogen absorption and swelling of the rubber. The solubility of hydrogen in the rubber material is proportional to the hydrogen pressure. During the operation of the fuel cell, the hydrogen pressure increases with the increase of the load, so the rubber will have different swelling amounts under different loads. In this embodiment, the annular inner ridge 313 and the annular outer ridge 312 of the sealing structure 3 are symmetrically arranged both axially and radially. When used in the hydrogen sealing environment of a hydrogen fuel cell, the hydrogen absorption and swelling deformation are isotropic. During the extrusion or swelling process of the rubber under different loads, the acting directions of the annular inner ridge 313 and the annular outer ridge 312 are always perpendicular to the wall surface of the groove 13, and a stable and uniform linear sealing band can be formed.

[0061] In this article, specific examples are used to elaborate on the principles and implementation manners of the present invention. The descriptions of the above embodiments are only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principles of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A sealing structure, characterized in that, The sealing structure includes an annular portion. The annular portion has annular sealing ends at both axial ends and an annular middle section between the two annular sealing ends. The annular middle section has an annular inner peripheral portion and an annular outer peripheral portion, and both the annular inner peripheral portion and the annular outer peripheral portion are ridge structures. The annular portion further includes a plurality of protrusions spaced along the ridge structures. The protrusions are provided in the middle of the ridge structures and protrude radially from the ridge structures. The sealing structure is received in a groove. The cross-section of the annular portion between adjacent protrusions is a first cross-section, and the cross-section at the position of the protrusion is a second cross-section. The lengths of the first cross-section and the second cross-section are equal and greater than the groove depth. The width of the first cross-section is less than the width of the groove. The width of the second cross-section is the distance between the protrusion of the annular inner peripheral portion and the protrusion of the annular outer peripheral portion, and the width of the second cross-section is greater than the width of the groove. The ratio range of the width of the first cross-section to the width of the groove is 0.8 - 0.

9.

2. The sealing structure according to claim 1, wherein, The ratio range of the lengths of the first cross-section and the second cross-section to the groove depth is 1.2 - 1.

5. The ratio range of the width of the second cross-section to the width of the groove is 1.05 - 1.

1.

3. The sealing structure according to claim 1, characterized in that The cross-section of the annular portion between adjacent protrusions is a first cross-section. The length of the first cross-section is greater than the width of the first cross-section, and the length direction of the first cross-section is parallel to the axial direction.

4. The sealing structure according to claim 3, characterized in that The ratio range of the length of the first cross-section to the width of the first cross-section is 2.0 - 2.

5.

5. The sealing structure according to claim 1, characterized in that, The included angle range of the ridge structures is 145° - 155°.

6. The sealing structure according to claim 1, characterized in that, The outer contour of the cross-section of the annular sealing end is an arc.

7. The sealing structure according to claim 6, characterized in that, The cross-section of the annular portion between adjacent protrusions is a first cross-section. The ratio range of the radius of the arc to the width of the first cross-section is 0.2 - 0.

3.

8. The sealing structure according to any one of claims 1-6, characterized in that The ridge structures and the annular sealing ends are in smooth transition.

9. The sealing structure according to any one of claims 1-6, characterized in that, The sealing structure includes at least two of the annular portions, and adjacent two annular portions partially overlap and are joined together as a whole.

10. The sealing structure according to any one of claims 1-6, characterized in that, The total circumferential length of the plurality of protrusions on the annular outer peripheral portion is 10% - 15% of the total length of the annular outer peripheral portion. The total circumferential length of the plurality of protrusions on the annular inner peripheral portion is 10% - 15% of the total length of the annular inner peripheral portion.

11. A sealing system, characterized in that, The sealing system includes a first structural member and a second structural member. The first structural member and the second structural member respectively include a first hole and a second hole in butt joint, and a first sealing end face and a second sealing end face in butt joint and respectively surrounding the first hole and the second hole. At least one of the first sealing end face and the second sealing end face is provided with a groove to receive the sealing structure. The sealing structure is the sealing structure according to any one of claims 1 - 10. The ridge structures of the sealing structure form a continuous loop seal in the circumferential direction.

12. The sealing system according to claim 11, wherein The sealing system further includes a channel provided in the first structural member and / or the second structural member. The channel communicates the groove with the first hole or the second hole.

13. The sealing system according to claim 12, wherein The groove is provided on the first sealing end face. The groove divides the first sealing end face into an inner sealing end face close to the first hole and an outer sealing end face away from the first hole. The outer sealing end face is in contact with the second sealing end face, and there is an annular gap between the inner sealing end face and the second sealing end face. The annular gap forms the channel.

14. The sealing system according to claim 13, characterized in that, The ratio of the axial length of the annular gap to the groove depth of the groove ranges from 0.08 to 0.

12.

15. The sealing system according to claim 11, characterized in that, The first structural member and the second structural member are provided with multiple groups of corresponding first holes and second holes. The sealing structure includes a corresponding number of annular parts. Each annular part correspondingly seals a group of the first holes and the second holes, and partial overlaps of adjacent annular parts are joined together as a whole.

16. The sealing system according to any one of claims 11-15, characterized in that, The sealing system is a proton exchange membrane fuel cell system. The sealing system includes three groups of the first holes and the second holes. The sealing structure includes three corresponding annular parts. The three groups of the first holes and the second holes respectively correspond to the flow of coolant, air, and hydrogen.

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