Pipeline flange end face sealing structure and ultralow-temperature medium liquid rocket
By using a sealing assembly with a shaped spring and an elastic sealing shell on the flange end face of the liquid rocket pipeline, the problem of poor adaptability of the sealing structure in the reusable liquid rocket is solved, achieving efficient sealing effect and cost optimization.
Patent Information
- Application Number
- CN202411975724.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-23
AI Technical Summary
The existing flange end face sealing structure for liquid rocket pipelines has poor adaptability during repeated use, resulting in poor sealing performance, and also has high processing precision and cost.
The sealing assembly, which uses a shaped spring and an elastic sealing shell, achieves adaptive deformation through the elastic force of the shaped spring, ensuring that the sealing assembly can still fit tightly after the flange is deformed. Combined with the vent design, it avoids the accumulation of gaseous media and enhances the reliability of the seal.
It improves the adaptability and reliability of the sealing structure, reduces the requirements for machining accuracy and production costs, reduces the risk of seal wear, and enhances the sealing effect.
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Figure CN121383005A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of flange end face sealing, in particular to a pipeline flange end face sealing structure and an ultralow-temperature medium liquid rocket. BACKGROUND
[0002] In the past decade, with the rapid development of domestic commercial aerospace, the recycling and reuse technology of ultralow-temperature medium liquid rockets (for convenience of description, hereinafter referred to as "liquid rockets") is an important way to reduce the cost of liquid rockets, and the sealing technology is an important link of the reuse of liquid rockets, which directly affects the service life and reliability of liquid rockets; therefore, the research on the pipeline flange end face sealing technology of liquid rockets is carried out to meet the requirements of the reuse of liquid rockets, which has theoretical research value and economic value.
[0003] At present, the sealing of the pipeline flange end face of the liquid rocket mainly relies on two structural forms of flexible graphite sealing ring and metal sealing ring. However, after the liquid rocket is reused for many times, the structure of the rocket body will be deformed or worn out. In this way, the originally matched flexible graphite sealing ring and metal sealing ring cannot well adapt to the changed rocket body structure, thereby affecting the subsequent sealing effect of the pipeline flange end face. SUMMARY
[0004] Therefore, the present application provides a pipeline flange end face sealing structure and an ultralow-temperature medium liquid rocket to solve the problem of poor adaptability of the existing pipeline flange end face sealing structure.
[0005] In a first aspect, the present application provides a pipeline flange end face sealing structure for an ultralow-temperature medium liquid rocket, comprising:
[0006] A first flat flange, one side end face of which is provided with an annular groove coaxially arranged therewith;
[0007] A sealing assembly arranged in the annular groove and matched with the annular groove, the sealing assembly comprising a special-shaped spring and an elastic sealing shell sleeved outside the special-shaped spring, the special-shaped spring being annular and coaxially arranged with the annular groove;
[0008] A second flat flange used in cooperation with the first flat flange and forming a space for placing the sealing assembly between the annular groove and the second flat flange;
[0009] The opposite sides of the outer surface of the elastic sealing shell are respectively tightly attached to the groove bottom of the annular groove and the end face of the second flat flange.
[0010] Beneficial effects: compared with the flexible graphite sealing ring and the metal sealing ring, the sealing assembly of the present application can have strong elastic deformation capacity by means of the elastic force of the special-shaped spring, so that even if the first flat flange and the second flat flange appear local deformation or loss during repeated use, the sealing assembly can adaptively adjust its own shape based on the shape of the first flat flange and the second flat flange after deformation, to continuously maintain the sealing state of closely fitting with the first flat flange and the second flat flange, and ensure that the sealing effect is not affected. In this way, the problem that the compression amount of the flexible graphite sealing ring or the metal sealing ring is difficult to accurately control during use is solved, effectively making up for the defects that the excessive compression amount of the flexible graphite sealing ring or the metal sealing ring easily leads to excessive wear of the sealing member, and the small compression amount cannot achieve good sealing effect. In addition, since the sealing assembly has self-adaptability to the deformation of the flange end face, the machining precision of the first flat flange and the second flat flange is not required to be high, the machining tolerance range is relaxed, and the machining difficulty and cost are reduced. Moreover, compared with the metal sealing ring, the sealing assembly of the present application can also reduce the requirement for the material hardness of the flange end face, and reduce the production cost.
[0011] In addition, the sealing assembly of the present application can also have a self-tight sealing effect by means of the elastic force of the special-shaped spring. Specifically, during the operation of the ultra-low temperature medium liquid rocket, heat exchange between the ultra-low temperature medium and the external environment is inevitable. In this process, the pressure of the ultra-low temperature medium will gradually increase with the heat transfer, so the force of the ultra-low temperature medium acting on the elastic sealing shell will also become larger. When the force is transmitted to the special-shaped spring, the special-shaped spring will produce corresponding deformation according to the change of the external force, which can make the sealing assembly adaptively adjust the contact state between the first flat flange and the second flat flange, and ensure that there is always enough contact stress between the elastic sealing shell and the first flat flange and the second flat flange, so as to improve the reliability of the sealing.
[0012] In an alternative embodiment, the special-shaped spring comprises a pair of spring monomers, one end of the pair of spring monomers is welded, and the other end extends away from each other; the connecting end of the pair of spring monomers is located on the side away from the center hole of the first flat flange.
[0013] Beneficial effects: One end of a pair of spring monomers is welded and the connecting end is located on the side away from the center hole of the first plane flange, and the other end extends outward. This structure enables the special-shaped spring to more evenly disperse pressure when stressed, effectively avoiding the problem of stress concentration, thereby improving the overall stability and durability of the special-shaped spring. At the same time, when the sealing assembly is subjected to pressure from the ultra-low temperature medium or external force due to flange deformation, this structure enables the special-shaped spring to better exert its elastic deformation capability, providing stable and precise elastic support for the elastic sealing shell, ensuring that the sealing shell can be tightly attached to the flange surface, further enhancing the sealing effect of the sealing structure on the ultra-low temperature medium, and improving the reliability of the entire pipeline flange end face sealing structure.
[0014] In an optional embodiment, the outer peripheral edge of the spring monomer is provided with a plurality of notches arranged along the circumferential direction, and a toothed structure is formed between adjacent two notches.
[0015] Beneficial effects: By providing notches on the outer peripheral edge of the spring monomer, on the one hand, the deformation amount of the special-shaped spring can be further improved while reducing the rigidity value of the special-shaped spring, ensuring that the special-shaped spring can still effectively compensate when the pipeline flange end face deforms greatly. On the other hand, the weight of the special-shaped spring can be reduced, reducing the impact on the weight of the ultra-low temperature medium liquid rocket.
[0016] In an optional embodiment, a through hole is provided on the toothed structure.
[0017] Beneficial effects: By providing a through hole on the toothed structure, the special-shaped spring can be further lightened, and the rigidity value of the special-shaped spring can be further reduced.
[0018] In an optional embodiment, the special-shaped spring is a plurality of special-shaped springs, and the plurality of special-shaped springs are sequentially arranged.
[0019] Beneficial effects: Compared with the method of increasing the thickness of a single special-shaped spring to achieve a predetermined thickness, the present application uses a plurality of special-shaped springs arranged sequentially to achieve a predetermined thickness, which can reduce the rigidity value of the combined special-shaped spring, so that the combined special-shaped spring can more easily deform elastically, ensuring the timeliness of the compensation of the sealing assembly.
[0020] In an optional embodiment, an arc-shaped protrusion is provided on the outer surface of the elastic sealing shell and the groove bottom of the annular groove and the end face of the second plane flange.
[0021] Beneficial effects: By setting the arc-shaped protrusions on the outer surface of the elastic sealing shell, it can ensure that the elastic sealing shell is in full contact with the first and second flat flanges during installation, realizing the close-fitting state of the elastic sealing shell and the first and second flat flanges, and ensuring the sealing effect. Further, setting the shape of the protrusions as arc-shaped can make the elastic sealing shell deform uniformly to both sides after being stressed. In this way, the contact pressure on the elastic sealing shell always remains a relatively uniform distribution state, avoiding the risk of sealing failure caused by excessive or insufficient local pressure, and enhancing the reliability and stability of the sealing.
[0022] In an alternative embodiment, the sealing assembly further comprises an L-shaped support ring adapted to the annular groove, which is arranged between the inner side wall of the annular groove and the elastic sealing shell.
[0023] Beneficial effects: The L-shaped support ring simplifies the installation process of the sealing assembly, and its adaptive design with the annular groove makes the sealing assembly easier to position and fix during assembly, reducing assembly time and difficulty. In addition, the L-shaped support ring provides strong support for the elastic sealing shell, enhancing the overall stability of the sealing assembly and reducing the possibility of damage during transportation and installation.
[0024] In an alternative embodiment, the side surface of the elastic sealing shell away from the center hole of the first flat flange is in the shape of a circular arc and is tangentially arranged with the vertical part of the L-shaped support ring.
[0025] Beneficial effects: The side surface of the elastic sealing shell is a circular arc surface tangent to the vertical part of the L-shaped support ring, so that the elastic sealing shell has the ability to rotate when the first and second flat flanges have local deformation or the flatness of the end faces is inclined. This rotating ability enhances the adaptability of the sealing assembly, and even after the ultra-low temperature medium liquid rocket has been used repeatedly, the sealing assembly can still effectively play its sealing role using the above characteristics.
[0026] In an alternative embodiment, the annular groove is provided with an exhaust hole on the side wall close to the center hole of the first flat flange, which is in communication with the center hole of the first flat flange.
[0027] Beneficial effects: Because the ultra-low temperature medium will inevitably exchange heat with the external environment, part of the ultra-low temperature medium will become vaporized medium in the process of heat exchange. If the vaporized medium continuously accumulates in the annular groove, the pressure in this area will continue to rise, which may cause a gap between the sealing surface of the sealing assembly and the first and second flat flanges, increasing the risk of leakage of low-temperature medium. Based on the above reasons, the exhaust hole is arranged to timely and smoothly exhaust the vaporized medium in the annular groove area. In this way, the sealing assembly can always be in the environment of liquid medium, avoiding the sealing failure caused by the accumulation of gaseous medium.
[0028] In a second aspect, the present application also provides an ultra-low temperature medium liquid rocket, comprising the pipeline flange end face sealing structure described above.
[0029] Beneficial effects: The ultra-low temperature medium liquid rocket installed with the pipeline flange end face sealing structure has all the advantages of the pipeline flange end face sealing structure, so it is not repeated here. BRIEF DESCRIPTION OF DRAWINGS
[0030] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.
[0031] Figure 1 It is a structure schematic view of a pipeline flange end face sealing structure of an embodiment of the present application.
[0032] Figure 2 It is a structure schematic view of a pipeline flange end face sealing structure of an embodiment of the present application. Figure 1 It is a partial enlarged view of A.
[0033] Figure 3 It is a top view schematic view of a special-shaped spring of an embodiment of the present application.
[0034] Figure 4 It is a top view schematic view of a special-shaped spring of an embodiment of the present application. Figure 3 It is a partial enlarged view of B.
[0035] Explanation of reference signs:
[0036] 1, the first plane flange; 101, the annular groove; 1011, the exhaust hole; 102, the center hole; 2, the sealing assembly; 201, the special-shaped spring; 2011, the spring unit; 2012, the notch; 2013, the tooth structure; 2014, the through hole; 202, the elastic sealing shell; 2021, the arc convex; 203, the L-shaped support ring; 3, the second plane flange. DETAILED DESCRIPTION
[0037] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.
[0038] In view of the poor reliability of the existing pipeline flange end face sealing structure, the present application provides a pipeline flange end face sealing structure and an ultralow-temperature medium liquid rocket.
[0039] The embodiments of the present application will be described below with reference to the drawings. Figures 1 to 4
[0040] According to the embodiments of the present application, on one hand, as shown in Figure 1 and Figure 2 , a pipeline flange end face sealing structure for an ultralow-temperature medium liquid rocket is provided, which comprises a first plane flange 1, a sealing assembly 2 and a second plane flange 3.
[0041] Specifically, the first plane flange 1 is provided with an annular groove 101 coaxially arranged on one side end face thereof; the sealing assembly 2 is arranged in the annular groove 101 and is adapted to the annular groove 101, the sealing assembly 2 comprises a special-shaped spring 201 and an elastic sealing shell 202 sleeved outside the special-shaped spring 201, the special-shaped spring 201 is annular and coaxially arranged with the annular groove 101; the second plane flange 3 is used in cooperation with the first plane flange 1 and forms a space for placing the sealing assembly 2 between the annular groove 101; the opposite sides of the outer surface of the elastic sealing shell 202 are tightly attached to the groove bottom of the annular groove 101 and the end face of the second plane flange 3, respectively.
[0042] Compared with the flexible graphite sealing ring and the metal sealing ring, the sealing assembly 2 can have strong elastic deformation capacity by means of the elastic force of the special-shaped spring 201, so that even if the first flat flange 1 and the second flat flange 3 are locally deformed or worn during repeated use, the sealing assembly 2 can adaptively adjust its shape based on the deformed shape of the first flat flange 1 and the second flat flange 3 to continuously maintain a sealing state closely attached to the first flat flange 1 and the second flat flange 3, ensuring that the sealing effect is not affected. In this way, the problem that the compression amount of the flexible graphite sealing ring or the metal sealing ring is difficult to accurately control during use is solved, effectively making up for the defects that excessive compression amount of the flexible graphite sealing ring or the metal sealing ring easily leads to excessive wear of the sealing member, and too small compression amount cannot achieve good sealing effect. In addition, since the sealing assembly 2 has adaptability to the deformation of the flange end face of the pipeline, high standard requirements for the machining precision of the first flat flange 1 and the second flat flange 3 can be eliminated, the machining tolerance range is relaxed, and the machining difficulty and cost are reduced. Moreover, compared with the metal sealing ring, the sealing assembly 2 can also reduce the requirement for the material hardness of the flange end face of the pipeline, thereby reducing the production cost.
[0043] In addition, the sealing assembly 2 can also have a self-tightening sealing effect by means of the elastic force of the special-shaped spring 201. Specifically, during the operation of the liquid rocket of the ultra-low temperature medium, heat exchange between the ultra-low temperature medium and the external environment is inevitable. In this process, the pressure of the ultra-low temperature medium will gradually increase with the heat transfer, so the force of the ultra-low temperature medium acting on the elastic sealing shell 202 will also become larger. When the force is transmitted to the special-shaped spring 201, the special-shaped spring 201 will deform according to the change of the external force, and the deformation can make the sealing assembly 2 adaptively adjust the contact state between the first flat flange 1 and the second flat flange 3, so as to ensure that there is always enough contact stress between the elastic sealing shell 202 and the first flat flange 1 and the second flat flange 3, thereby improving the reliability of the sealing.
[0044] Further, to ensure that the sealing assembly 2 can be closely attached to the first flat flange 1 and the second flat flange 3 under the action of the special-shaped spring 201 and the medium pressure, the contact stress between the elastic sealing shell 202 and the first flat flange 1 and the second flat flange 3 needs to be not less than 1.5 times the medium pressure.
[0045] It should be noted that the ultra-low temperature medium includes but is not limited to liquid oxygen, liquid methane and liquid hydrogen.
[0046] According to an embodiment of the present application, as Figure 2As shown, the special-shaped spring 201 comprises a pair of spring monomers 2011, one end of the pair of spring monomers 2011 is welded, and the other end extends in a direction away from each other; the connecting end of the pair of spring monomers 2011 is located on the side away from the center hole 102 of the first plane flange 1. The pair of spring monomers 2011 are welded at one end and the connecting end is located on the side away from the center hole 102 of the first plane flange 1, and the other end extends outward. This structure enables the special-shaped spring 201 to more evenly disperse the pressure when stressed, effectively avoiding the problem of stress concentration, thereby improving the overall stability and durability of the special-shaped spring 201. At the same time, when the sealing assembly 2 is subjected to pressure from the ultra-low temperature medium or external force due to flange deformation, this structure enables the special-shaped spring 201 to better exert its elastic deformation capability, providing stable and precise elastic force support for the elastic sealing shell 202, ensuring that the sealing shell can be tightly attached to the surface of the flange, further enhancing the sealing effect of the sealing structure on the ultra-low temperature medium, and improving the reliability of the entire pipeline flange end face sealing structure.
[0047] According to one embodiment of the present application, as Figures 2 to 4 As shown, the outer peripheral edge of the spring monomer 2011 is provided with a plurality of notches 2012 arranged along the circumferential direction, and a toothed structure 2013 is formed between adjacent two notches 2012. By providing notches 2012 on the outer peripheral edge of the spring monomer 2011, on the one hand, the rigidity value of the special-shaped spring 201 can be reduced while the deformation amount of the special-shaped spring 201 is further improved, ensuring that the special-shaped spring 201 can still effectively compensate when the pipeline flange end face deforms greatly; on the other hand, the weight of the special-shaped spring 201 can be reduced, reducing the impact on the weight of the ultra-low temperature medium liquid rocket.
[0048] It should be noted that the shape of the toothed structure 2013 in this embodiment can be limited to triangular, trapezoidal and square. Specifically, adaptive adjustments can be made according to design needs, and the present application does not make specific limitations.
[0049] According to one embodiment of the present application, as Figure 4 As shown, the toothed structure 2013 is provided with a through hole 2014. By providing a through hole 2014 on the toothed structure 2013, the special-shaped spring 201 can be further lightened, and the rigidity value of the special-shaped spring 201 can be further reduced.
[0050] According to one embodiment of the present application, the profile spring 201 is in plurality, and the plurality of profile springs 201 are arranged in sequence. Compared with the way of increasing the thickness of a single profile spring 201 to achieve a preset thickness, the present embodiment adopts the way of arranging the plurality of profile springs 201 in sequence to achieve the preset thickness, which can reduce the stiffness value of the effective combined profile spring 201, so that the combined profile spring 201 can be more easily elastically deformed, thereby ensuring the timeliness of the compensation of the sealing assembly 2. Further, in order to ensure the integrity of the plurality of profile springs 201 arranged in sequence, the adjacent two profile springs 201 can be connected together by welding.
[0051] According to one embodiment of the present application, as shown in Figure 2 The outer surface of the elastic sealing shell 202 and the end surface of the second flat flange 3 that is in close contact with the groove bottom of the annular groove 101 are both provided with an arc-shaped protrusion 2021. By arranging the arc-shaped protrusion 2021 on the outer surface of the elastic sealing shell 202, it can be ensured that the elastic sealing shell 202 is in full contact with the first flat flange 1 and the second flat flange 3 during installation, so as to achieve the close contact state of the elastic sealing shell 202 with the first flat flange 1 and the second flat flange 3, and ensure the sealing effect. Further, by arranging the shape of the protrusion as an arc, the elastic sealing shell 202 can uniformly deform to both sides after being stressed. In this way, the contact pressure on the elastic sealing shell 202 always remains in a relatively uniform distribution state, avoiding the risk of sealing failure caused by excessive or insufficient local pressure, thereby enhancing the reliability and stability of the sealing.
[0052] It can be understood that, in order to ensure that the elastic sealing shell 202 can be in close contact with the first flat flange 1 and the second flat flange 3 in the installed state, the sealing assembly 2 can be slightly larger than the size (i.e. thickness) of the first flat flange 1, that is, at least part of the structure of the arc-shaped protrusion 2021 is located outside the annular groove 101 before the arc-shaped protrusion 2021 is covered on the annular groove 101 by the second flat flange 3.
[0053] According to one embodiment of the present application, as shown in Figure 2 The sealing assembly 2 further comprises an L-shaped support ring 203 that is adapted to the annular groove 101, and the L-shaped support ring 203 is arranged between the inner side wall of the annular groove 101 and the elastic sealing shell 202. The L-shaped support ring 203 simplifies the installation process of the sealing assembly 2, and the adaptive design of the L-shaped support ring 203 and the annular groove 101 makes the sealing assembly 2 easier to position and fix during assembly, thereby reducing the assembly time and difficulty. In addition, the L-shaped support ring 203 provides strong support for the elastic sealing shell 202, enhances the overall stability of the sealing assembly 2, and reduces the possibility of damage to the sealing assembly 2 during transportation and installation.
[0054] According to an embodiment of the present application, as shown in Figure 2 The side surface of the elastic sealing shell 202 away from the center hole 102 of the first plane flange 1 is in the shape of a circular arc and is tangent to the vertical part of the L-shaped support ring 203.
[0055] The side surface of the elastic sealing shell 202 is a circular arc tangent to the vertical part of the L-shaped support ring 203, so that the elastic sealing shell 202 has the ability to rotate when the end faces of the first plane flange 1 and the second plane flange 3 are locally deformed or the flatness of the two end faces is tilted. This rotation capability enhances the adaptability of the sealing assembly 2, so that even after the liquid rocket of ultra-low temperature medium has been used repeatedly for many times, the sealing assembly 2 can still effectively play its sealing role by using the above-mentioned characteristics.
[0056] According to an embodiment of the present application, as shown in Figure 2 The annular groove 101 is provided with an exhaust hole 1011 communicating with the center hole 102 of the first plane flange 1 on the side wall close to the center hole 102 of the first plane flange 1. Because the ultra-low temperature medium will inevitably exchange heat with the external environment, part of the ultra-low temperature medium will become vaporized medium in the process of heat exchange. If the vaporized medium continues to accumulate in the annular groove 101, the pressure in this area will continue to rise, which may cause a gap between the sealing surfaces of the sealing assembly 2 and the first plane flange 1 and the second plane flange 3, increasing the risk of leakage of low-temperature medium. Based on the above reasons, the present application sets the exhaust hole 1011, which can timely and smoothly exhaust the vaporized medium in the annular groove 101 area. In this way, the sealing assembly 2 can always be in the environment of liquid medium, avoiding the sealing failure caused by the accumulation of gaseous medium.
[0057] According to an embodiment of the present application, in another aspect, a liquid rocket of ultra-low temperature medium is also provided, comprising the pipeline flange end face sealing structure described above. The liquid rocket of ultra-low temperature medium installed with the pipeline flange end face sealing structure has all the advantages of the pipeline flange end face sealing structure described above, and therefore will not be described here.
[0058] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.
Claims
1. A pipeline flange end face sealing structure for use in cryogenic liquid rockets, characterized in that, include: The first planar flange (1) has an annular groove (101) coaxially arranged on one end face; A sealing assembly (2) is disposed in the annular groove (101) and adapted to the annular groove (101). The sealing assembly (2) includes a shaped spring (201) and an elastic sealing shell (202) sleeved outside the shaped spring (201). The shaped spring (201) is annular and coaxially disposed with the annular groove (101). The second flat flange (3) is used in conjunction with the first flat flange (1) and forms a space for placing the sealing assembly (2) between itself and the annular groove (101); The opposite sides of the outer surface of the elastic sealing housing (202) are tightly fitted with the bottom of the annular groove (101) and the end face of the second planar flange (3), respectively.
2. The pipeline flange end face sealing structure according to claim 1, characterized in that, The irregular spring (201) includes a pair of spring units (2011), one end of the pair of spring units (2011) is welded and the other end extends in a direction away from each other; the connecting end of the pair of spring units (2011) is located on the side away from the center hole (102) of the first planar flange (1).
3. The pipeline flange end face sealing structure according to claim 2, characterized in that, The outer peripheral edge of the spring unit (2011) is provided with a plurality of notches (2012) spaced apart along its circumference, and a tooth-like structure (2013) is formed between two adjacent notches (2012).
4. The pipeline flange end face sealing structure according to claim 3, characterized in that, The toothed structure (2013) is provided with a through hole (2014).
5. The pipeline flange end face sealing structure according to claim 2, characterized in that, There are multiple irregular springs (201), and the multiple irregular springs (201) are sequentially nested.
6. The pipeline flange end face sealing structure according to any one of claims 1 to 5, characterized in that, The elastic sealing housing (202) has arc-shaped protrusions (2021) on its outer surface that fits against the bottom of the annular groove (101) and the end face of the second planar flange (3).
7. The pipeline flange end face sealing structure according to any one of claims 1 to 5, characterized in that, The sealing assembly (2) further includes an L-shaped support ring (203) adapted to the annular groove (101), the L-shaped support ring (203) being disposed between the inner wall of the annular groove (101) and the elastic sealing housing (202).
8. The pipeline flange end face sealing structure according to claim 7, characterized in that, The elastic sealing housing (202) has an arc-shaped surface on the side away from the center hole (102) of the first planar flange (1) and is tangential to the vertical portion of the L-shaped support ring (203).
9. The pipeline flange end face sealing structure according to any one of claims 1 to 5, characterized in that, The annular groove (101) has an exhaust hole (1011) on its side wall near the center hole (102) of the first planar flange (1), which is connected to the center hole (102) of the first planar flange (1).
10. A cryogenic liquid rocket, characterized in that, include: The pipeline flange end face sealing structure according to any one of claims 1 to 9.