A special rubber sealing ring for nuclear power plants and its preparation method

Abstract

The present invention relates to the technical field of sealing rings, and discloses a special rubber sealing ring for use in nuclear power plants and a preparation method thereof, comprising a sealing ring body, wherein an outer ring body and an inner ring body are arranged on the sealing ring body from the outside to the inside, the inner ring body being arranged in a horizontal M shape, pressure-resistant rings being arranged on the upper and lower sides of the inner ring body, a central reinforcement ring being arranged in the middle of the inner ring body, an inner gill ring and an outer gill ring being arranged between the central reinforcement ring and the pressure-resistant ring, a buffer cavity being formed between the inner gill ring and the inner ring body, expanded graphite particles being filled between the inner gill ring and the outer gill ring, and a heat transfer copper sheet being arranged in the middle of the inner gill ring. This solution transmits the supporting force to the solid fitting ring through the outer gill ring, thereby offsetting the sealing pressure loss caused by the failure of the buffer cavity and maintaining stable contact of the fitting ring; when a high pressure suddenly occurs, the cooperation of the supporting airway and the sealing tile provides support for the dynamic reset of the inner ring body, and realizes the dual protection of high pressure intrusion delay and internal air cavity overpressure release.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing rings, and in particular to a special rubber sealing ring for use in nuclear power plants and a preparation method thereof. Background Art

[0002] The sealing structures of nuclear power plant waste heat removal systems face conflicting demands for high-pressure resistance and dynamic displacement compensation. To address this, existing improvements have employed methods such as filling rubber with carbon fiber or employing metal-rubber composite structures. While these technologies can partially improve pressure resistance or compensation, they can also lead to failure due to elastic degradation, interfacial delamination, or high-temperature stress concentration. Therefore, these technologies do not meet existing requirements. Therefore, we propose a special rubber seal for nuclear power plants and its preparation method. Summary of the Invention

[0003] The present invention provides a special rubber sealing ring for nuclear power plants and a preparation method thereof. The special rubber sealing ring for nuclear power plants and the preparation method thereof can maintain contact with the inner wall of a container during dynamic displacement, prevent leakage, increase high-pressure resistance, and improve the sealing effect, thereby resolving the conflicting requirements of high-pressure tolerance and dynamic displacement compensation mentioned in the above-mentioned background technology.

[0004] To achieve the above-mentioned objectives, the present disclosure provides a special rubber sealing ring for a nuclear power plant, comprising a sealing ring body, wherein an outer ring body and an inner ring body are arranged on the sealing ring body from the outside to the inside, the inner ring body is arranged in a horizontal M shape, pressure-resistant rings are arranged on the upper and lower sides of the inner ring body, a central reinforcement ring is arranged in the middle of the inner ring body, an inner gill ring and an outer gill ring are arranged between the central reinforcement ring and the pressure-resistant ring, a buffer cavity is formed between the inner gill ring and the inner ring body, expanded graphite particles are filled between the inner gill ring and the outer gill ring, and a heat transfer copper sheet is arranged in the middle of the inner gill ring;

[0005] When the container end cover tends to separate from the cylinder, the height of the inner ring body is higher than the height of the outer ring body.

[0006] Optionally, a solid fitting ring, a first hollow fitting ring and a second hollow fitting ring are provided at the top of the pressure-resistant ring from the outside to the inside, and a first connecting hole and a second connecting hole are provided on the pressure-resistant ring. The first connecting hole connects the interior of the first hollow fitting ring with the buffer cavity, and the second connecting hole connects the interior of the second hollow fitting ring with the buffer cavity. A double-cavity connecting hole is provided on the center reinforcement ring, and the double-cavity connecting hole connects the upper and lower buffer cavities.

[0007] Optionally, a plurality of the first communicating holes, the second communicating holes and the dual-cavity communicating holes are respectively provided, and are all arranged at equal intervals around the circumference.

[0008] Optionally, a plurality of heat transfer fins are provided on the side of the heat transfer copper plate, and the plurality of heat transfer fins are arranged to be tilted downward. An arc-shaped resistance block is connected to the outer side of the outer gill ring, and an arc-shaped resistance block is provided corresponding to the outer edge of the pressure-resistant ring, and the arc-shaped resistance block is in contact with the arc-shaped resistance block.

[0009] Optionally, the center reinforcement ring is connected to the end of the outer ring body adjacent to a side ring for fitting with the side wall of the container end cover sealing ring, and a corrugated portion is provided between the side ring and the center reinforcement ring for stretching and buffering when the inner ring body is compressed.

[0010] Optionally, a bracket ring is installed on the side of the inner ring body away from the outer ring body, the cross-section of the bracket ring is an inverted V-shape, one end of the bracket ring is connected to the central reinforcement ring, and the other end of the bracket ring is forked, and the forked ends are respectively provided with an active folding part and a passive folding part, the passive folding part is integrally connected to the inner ring body, and a column ring is connected between the two active folding parts.

[0011] Optionally, a flow opening is provided on the side wall of the passive folding portion, a support air channel is extended inward from the flow opening, the support air channel is inclined, the support air channel is configured as a Tesla valve channel, the end point of the support air channel is the inner edge side wall of the inner ring body, the inner edge side wall of the inner ring body is configured with an air cavity for support, and the air cavity is connected to the end point of the support air channel.

[0012] Optionally, a sealing tile is integrally connected to the outer edge of the passive folding portion, the sealing tile is arranged corresponding to the circulation opening, and a plurality of the circulation opening, the supporting air channel and the sealing tile are arranged in a circumferential array;

[0013] When the container end cover and the cylinder tend to separate, there is a distance between the sealing tile and the flow opening, and the flow opening is unobstructed;

[0014] When the inner ring body is compressed, the active folding portion is pressed and fitted with the sealing tile, and the flow opening is blocked by the sealing tile.

[0015] Optionally, the surfaces of the sealing ring body, the outer ring body, the inner ring body, the bracket ring and the support ring are all covered with an anti-corrosion coating.

[0016] According to a second aspect of the present disclosure, a method for preparing a special rubber sealing ring for a nuclear power plant is provided, comprising:

[0017] S1. Refining mixed rubber, selecting a variety of rubber base materials and adding antioxidants and flame retardants during mixing;

[0018] S2, injection molding, prepare multiple sets of detachable mold cores, inject the mixed rubber into the mold, and pressurize it in stages;

[0019] S3, functional component embedding: pre-placed expanded graphite particles and heat transfer copper sheets are embedded during the vulcanization process, and the viscosity of the rubber before it is fully cured is used to achieve interface sealing;

[0020] S4. Finish the surface, trim the burrs on the edge of the sealing ring, and spray anti-corrosion coating.

[0021] Through the above technical solution, the special rubber sealing ring for nuclear power plants and the preparation method provided by the present invention are used as follows: when the buffer cavity ages and fails, if high-temperature and high-pressure fluid invades the buffer cavity, the heat transfer copper sheet transfers heat to the expanded graphite particles. After the expanded graphite particles expand, the supporting force is transferred to the solid bonding ring through the outer gill ring, offsetting the sealing pressure loss caused by the failure of the buffer cavity and maintaining stable contact of the bonding ring; when high pressure suddenly occurs, the cooperation of the supporting airway and the sealing tile provides support for the dynamic reset of the inner ring body, and realizes the dual protection of high-pressure intrusion delay and internal air cavity overpressure release, thereby increasing high-pressure resistance and improving the sealing effect.

[0022] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the overall three-dimensional explosion structure of the present invention.

[0026] Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure.

[0027] Figure 4 It is a schematic diagram of the overall cross-sectional structure during the separation trend of the present invention.

[0028] Figure 5 It is a schematic diagram of the overall cross-sectional structure of the sealing ring of the present invention during normal compression.

[0029] Figure 6 This is a schematic diagram of the main cross-sectional structure of the inner ring body during the separation trend of the present invention.

[0030] Figure 7 For the present invention Figure 6 Schematic diagram of the enlarged structure at point B.

[0031] Figure 8It is a schematic diagram of the cross-sectional structure of the flow port and the supporting airway of the present invention.

[0032] Figure 9 This is a schematic diagram of the inner ring structure of the sealing ring of the present invention when it is normally compressed.

[0033] Explanation of the reference numerals: 110, sealing ring body; 120, outer ring body; 130, inner ring body; 131, pressure-resistant ring; 132, center reinforcement ring; 140, side bonding ring; 150, corrugated part; 210, inner gill ring; 220, outer gill ring; 221, arc-shaped resistance block; 222, arc-shaped resistance block; 230, buffer chamber; 240, expanded graphite particles; 250, heat transfer copper sheet; 251, heat transfer fin; 310, bracket ring; 320, active folding part; 330, passive folding part; 340, flow port; 341, support air duct; 350, sealing tile; 360, column ring; 410, solid bonding ring; 420, first hollow bonding ring; 421, first connecting hole; 430, second hollow bonding ring; 431, second connecting hole; 441, double-cavity connecting hole. DETAILED DESCRIPTION

[0034] To make the above-mentioned objects, features, and advantages of the present disclosure more clearly understood, specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present disclosure. However, the present disclosure can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without violating the scope of the present disclosure. Therefore, the present disclosure is not limited to the specific embodiments disclosed below.

[0035] In the description of the present disclosure, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure. The terms "first" and "second" are used to distinguish one element from another and do not have sequentiality or importance. In addition, when the following description refers to the drawings, the same figure marks in different drawings represent the same or similar elements, which are not repeated in this disclosure.

[0036] In this disclosure, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0037] According to some embodiments of the present disclosure, a special rubber sealing ring for a nuclear power plant is provided, referring to Figures 1-9 As shown in , the special rubber sealing ring for nuclear power plants includes a sealing ring body 110, on which an outer ring body 120 and an inner ring body 130 are sequentially arranged from the outside to the inside. The inner ring body 130 is arranged in a transverse M shape. Specifically, the cross-section of the inner ring body 130 is a transverse M shape, and anti-pressure rings 131 are arranged on the upper and lower sides of the inner ring body 130. A central reinforcement ring 132 is arranged in the middle of the inner ring body 130, and an inner gill ring 210 and an outer gill ring 220 are arranged between the central reinforcement ring 132 and the anti-pressure ring 131. A buffer cavity 230 is formed between the inner gill ring 210 and the inner ring body 130, and expanded graphite particles 240 are filled between the inner gill ring 210 and the outer gill ring 220. A heat transfer copper sheet 250 is arranged in the middle of the inner gill ring 210.

[0038] See Figure 3 The outer gill ring 220 is located on the side of the inner gill ring 210 adjacent to the outer ring body 120. After the buffer cavity 230 fails, the heat transfer copper sheet 250 transfers the high temperature to the expanded graphite particles 240, causing the expanded graphite particles 240 to expand and provide support for the inner ring body 130.

[0039] In a normal state without force and when the container end cover and the cylinder body tend to separate, the height of the inner ring body 130 is higher than the height of the outer ring body 120.

[0040] So, see Figure 4 In normal state, the inner ring 130 is higher than the outer ring 120, ensuring that it contacts the container end cap first in the unpressurized state to form a pre-sealed interface. Figure 5 The container end cover and the cylinder squeeze the sealing ring, causing the inner ring body 130 to be compressed, and its internal buffer cavity 230 forms a symmetrical pressure distribution through the double-cavity connecting hole 441, forcing the compression deformation height of the inner ring body 130 to be consistent with the outer ring body 120, completing uniform contact sealing.

[0041] In addition, a solid fitting ring 410, a first hollow fitting ring 420 and a second hollow fitting ring 430 are sequentially arranged on the top of the anti-pressure ring 131 from the outside to the inside, and a first connecting hole 421 and a second connecting hole 431 are opened on the anti-pressure ring 131. The first connecting hole 421 connects the interior of the first hollow fitting ring 420 with the buffer cavity 230, and the second connecting hole 431 connects the interior of the second hollow fitting ring 430 with the buffer cavity 230. A double-cavity connecting hole 441 is opened on the center reinforcement ring 132, and the double-cavity connecting hole 441 connects the upper and lower buffer cavities 230.

[0042] The buffer cavity 230, the first hollow fitting ring 420 and the second hollow fitting ring 430 are filled with radiation absorbers to enhance the sealing ring's tolerance to radiation. Boron carbide powder or gadolinium oxide nanopowder can be selected, which have good neutron absorption, high temperature resistance, and high compatibility with rubber.

[0043] A plurality of first communicating holes 421 , a plurality of second communicating holes 431 and a plurality of dual-cavity communicating holes 441 are respectively provided, and are all arranged at equal intervals around the circumference.

[0044] During compression, since the two buffer chambers 230 are connected to each other, and the buffer chamber 230 is connected to the first hollow fitting ring 420 and the second hollow fitting ring 430, the cross-sectional width of the buffer chamber 230 increases during the compression process, and the internal gas is compressed and transmits a reaction force to the first hollow fitting ring 420 and the second hollow fitting ring 430, forming a "bidirectional supporting force" to suppress the displacement of the end cover due to pressure fluctuations. When a sudden high pressure occurs and causes the end cover and the cylinder to separate, the buffer cavity 230 quickly resets, and the overall height of the inner ring 130 is restored to seal with the bottom surface of the end cover. In addition, through the design of three fitting rings, namely the solid fitting ring 410, the first hollow fitting ring 420, and the second hollow fitting ring 430, the hollow fitting ring utilizes the compressible characteristics of gas to absorb dynamic pressure shocks, while the solid fitting ring 410 provides rigid support to achieve a redundant seal that combines rigidity and flexibility. When a sudden high pressure occurs and causes the end cover to separate from the cylinder, the gas pressure in the buffer cavity 230 drops sharply, the cavity quickly resets, the height of the inner ring 130 is restored, and the inverted M shape of the trapezoidal cross-section structure is re-fitted with the end cover to compensate for the gap change and further improve the reliability of dynamic sealing.

[0045] Further, see Figure 3 The heat transfer copper sheet 250 is equipped with several heat transfer fins 251 on its side, all of which are tilted downward. The outer gill ring 220 is connected to an arc-shaped abutment block 221, and the outer edge of the pressure-resistant ring 131 is correspondingly provided with an arc-shaped abutment block 222, with the arc-shaped abutment block 221 in contact with the arc-shaped abutment block 222. The heat transfer copper sheet 250 and the heat transfer fins 251 are both stamped and nickel-plated from red copper. The distributed layout of the heat transfer fins 251 avoids local overheating and ensures uniform expansion of the graphite particles.

[0046] Specifically, a side ring 140 is connected to the end of the center reinforcement ring 132 adjacent to the outer ring body 120 for fitting with the side wall of the container end cover sealing ring. A corrugated portion 150 is provided between the side ring 140 and the center reinforcement ring 132 for stretching and buffering when the inner ring body 130 is compressed.

[0047] See Figure 6 and Figure 9 The side ring 140 fits well with the end cover to increase the overall stability of the sealing ring. However, during dynamic sealing, the friction at the fitting point of the side ring 140 is relatively large. Therefore, when the horizontal position of the anti-pressure ring 131 changes, the corrugated portion 150 adopts a multi-segment pleated structure. Through elastic deformation, the horizontal displacement of the anti-pressure ring 131 is absorbed, avoiding sliding friction between the side ring 140 and the side wall of the end cover, thereby reducing the wear rate and avoiding rubber tearing caused by overload of the anti-pressure ring 131.

[0048] Through the above technical solution, the special rubber sealing ring for a nuclear power plant provided by the present disclosure, when in use, due to the arrangement of the expanded graphite particles 240 and the heat transfer copper sheet 250, when the buffer cavity 230 ages and fails, if a high-temperature, high-pressure fluid invades the buffer cavity 230, the heat transfer copper sheet 250 located in the middle of the inner gill ring 210 will transfer the temperature to the heat transfer fins 251. The heat is then evenly transferred to the nearby expanded graphite particles 240 through the multiple heat transfer fins 251, causing the graphite volume to expand and fill the gap between the outer gill ring 220 and the anti-pressure ring 131 to form a rigid support. The arc-shaped contact block 221 and the arc-shaped receiving block 222 cooperate to form a tighter contact between the expanded graphite particles 240 after the expansion of the two, thereby providing greater support for the anti-pressure ring 131, allowing the solid fitting ring 410 to be stably fitted and sealed, significantly enhancing the compressive strength of the sealing interface, and improving the safety and reliability of the sealing ring.

[0049] It should be noted that the inner ring body 130 , the outer ring body 120 and the sealing ring body 110 are made of fluororubber or mixed rubber, and radiation absorber and anti-aging additive are added therein, and the gas inside the buffer cavity 230 is an inert gas.

[0050] In some embodiments of the present disclosure, reference Figures 1-9 As shown in , a bracket ring 310 is installed on the side of the inner ring body 130 away from the outer ring body 120. The cross-section of the bracket ring 310 is an inverted V-shaped. One end of the bracket ring 310 is connected to the central reinforcement ring 132, and the other end of the bracket ring 310 is forked. The forked ends are respectively provided with an active folding portion 320 and a passive folding portion 330. The passive folding portion 330 is integrally connected to the inner ring body 130, and a pillar ring 360 is connected between the two active folding portions 320. The setting of the pillar ring 360 provides support for the active folding portion 320, preventing the bracket ring 310 from causing the inner edge of the anti-compression ring 131 to collapse after compression and folding.

[0051] See Figure 7 and Figure 8 The side wall of the passive folding portion 330 is provided with a flow opening 340, and a support air channel 341 extends inward from the flow opening 340. The support air channel 341 is arranged at an angle and is arranged as a Tesla valve channel. The end point of the support air channel 341 is the inner edge side wall of the inner ring body 130. The inner edge side wall of the inner ring body 130 is provided with an air cavity for support, and the air cavity is connected to the end point of the support air channel 341.

[0052] The passive folding portion 330 is integrally connected to the outer edge thereof with a sealing tile 350 . The sealing tile 350 is arranged corresponding to the flow opening 340 . A plurality of the flow opening 340 , the supporting air channel 341 and the sealing tile 350 are arranged in a circumferential array.

[0053] See Figure 6 When there is no force in the normal state and the container end cover and the cylinder tend to separate, there is a distance between the sealing tile 350 and the flow opening 340, and the flow opening 340 is unobstructed;

[0054] See Figure 9 When the inner ring body 130 is compressed, the active folding portion 320 is squeezed and fitted with the sealing tile 350 , and the flow opening 340 is blocked by the sealing tile 350 .

[0055] It should be noted that the surfaces of the sealing ring body 110 , the outer ring body 120 , the inner ring body 130 , the bracket ring 310 and the support ring 360 are all covered with an anti-corrosion coating, and the supporting air channel 341 is realized by a 3D printing core.

[0056] Through the above technical solution, the special rubber sealing ring for nuclear power plants provided by the present invention is set as a Tesla valve channel through the support air channel 341 when in use. When a sudden high pressure causes the end cover cylinder to separate, the flow port 340 is unblocked and the high-pressure fluid enters the flow port 340. However, the Tesla valve channel has a high resistance characteristic for reverse flow, so the fluid can only enter the support air channel 341 at a low speed, forming a buffer delay effect. The Tesla valve channel runs the fluid slowly, so after the fluid slowly enters the support air channel 341, it converges at the air cavity for support set on the inner edge side wall of the inner ring body 130, thereby supporting the height reset of the inner ring body 130 during dynamic sealing, so that the inner edge of the anti-pressure ring 131 is strongly supported, and the first hollow fitting ring 420 and the second hollow fitting ring 430 are stably fitted with the end cover, and at the same time, the inner edge of the sealing ring body 110 is also tightly fitted with the cylinder.

[0057] When the inner ring 130 is compressed, the active folding portion 320 and the passive folding portion 330 fold, the active folding portion 320 squeezes the sealing tile 350, and the sealing tile 350 fits against the sidewall of the passive folding portion 330, thereby blocking the flow port 340. When the inner ring 130 is compressed, the fluid in the air cavity at the inner edge of the inner ring 130 is discharged. Due to the characteristics of the Tesla valve channel, the fluid can be discharged quickly at this time, avoiding the risk of cavity explosion caused by gas compression.

[0058] In some embodiments of the present disclosure, a method for preparing a special rubber sealing ring for a nuclear power plant is provided, comprising:

[0059] S1. Refining mixed rubber, selecting a variety of rubber base materials and adding antioxidants and flame retardants during mixing;

[0060] S2, injection molding, prepare multiple sets of detachable mold cores, inject the mixed rubber into the mold, and pressurize it in stages;

[0061] S3, embedding functional components: embedding pre-placed expanded graphite particles 240 and heat transfer copper sheets 250 during the vulcanization process, and utilizing the viscosity of the rubber when it is not fully cured to achieve interface sealing;

[0062] S4. Finish the surface, trim the burrs on the edge of the sealing ring, and spray anti-corrosion coating.

[0063] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0064] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0065] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A special rubber sealing ring for a nuclear power plant, comprising a sealing ring body (110), wherein the sealing ring body (110) is provided with an outer ring body (120) and an inner ring body (130) from the outside to the inside, characterized in that: The inner ring body (130) is arranged in a transverse M shape, and pressure-resistant rings (131) are arranged on the upper and lower sides of the inner ring body (130), a central reinforcement ring (132) is arranged in the middle of the inner ring body (130), an inner gill ring (210) and an outer gill ring (220) are arranged between the central reinforcement ring (132) and the pressure-resistant ring (131), a buffer cavity (230) is formed between the inner gill ring (210) and the inner ring body (130), expanded graphite particles (240) are filled between the inner gill ring (210) and the outer gill ring (220), and a heat transfer copper sheet (250) is arranged in the middle of the inner gill ring (210); When the container end cover and the cylinder body tend to separate, the height of the inner ring body (130) is higher than the height of the outer ring body (120).

2. The special rubber sealing ring for a nuclear power plant according to claim 1, characterized in that: The top of the anti-pressure ring (131) is provided with a solid fitting ring (410), a first hollow fitting ring (420) and a second hollow fitting ring (430) from the outside to the inside. The anti-pressure ring (131) is provided with a first communicating hole (421) and a second communicating hole (431). The first communicating hole (421) connects the interior of the first hollow fitting ring (420) with the buffer cavity (230), and the second communicating hole (431) connects the interior of the second hollow fitting ring (430) with the buffer cavity (230). The central reinforcing ring (132) is provided with a double-cavity communicating hole (441). The double-cavity communicating hole (441) connects the upper and lower buffer cavities (230).

3. The special rubber sealing ring for a nuclear power plant according to claim 2, characterized in that: The first communicating hole (421), the second communicating hole (431) and the double-cavity communicating hole (441) are respectively provided in plurality, and are all arranged at equal intervals around the circumference.

4. The special rubber sealing ring for a nuclear power plant according to claim 1, characterized in that: A plurality of heat transfer fins (251) are provided on the side of the heat transfer copper sheet (250), and the plurality of heat transfer fins (251) are all arranged to be tilted downward. An arc-shaped resistance block (221) is connected to the outside of the outer gill ring (220), and an arc-shaped resistance block (222) is correspondingly provided on the outer edge of the pressure-resistant ring (131), and the arc-shaped resistance block (221) is in contact with the arc-shaped resistance block (222).

5. The special rubber sealing ring for a nuclear power plant according to claim 1, characterized in that: The end of the central reinforcement ring (132) adjacent to the outer ring body (120) is connected to a side contact ring (140) for contacting with the side wall of the container end cover sealing ring. A corrugated portion (150) is provided between the side contact ring (140) and the central reinforcement ring (132) for stretching and buffering the inner ring body (130) when it is compressed.

6. The special rubber sealing ring for a nuclear power plant according to claim 1, characterized in that: A bracket ring (310) is installed on the side of the inner ring body (130) away from the outer ring body (120), and the cross-section of the bracket ring (310) is an inverted V-shape. One end of the bracket ring (310) is connected to the central reinforcement ring (132), and the other end of the bracket ring (310) is forked, and the forked ends are respectively provided with an active folding part (320) and a passive folding part (330), and the passive folding part (330) is integrally connected to the inner ring body (130), and a support ring (360) is connected between the two active folding parts (320).

7. The special rubber sealing ring for a nuclear power plant according to claim 6, characterized in that: The side wall of the passive folding portion (330) is provided with a flow opening (340), and a support air channel (341) extends inward from the flow opening (340), and the support air channel (341) is arranged at an angle. The support air channel (341) is arranged as a Tesla valve channel, and the end point of the support air channel (341) is the inner edge side wall of the inner ring body (130). The inner edge side wall of the inner ring body (130) is provided with an air cavity for support, and the air cavity is connected to the end point of the support air channel (341).

8. The special rubber sealing ring for a nuclear power plant according to claim 7, characterized in that: The outer edge of the passive folding portion (330) is integrally connected with a sealing tile (350), the sealing tile (350) being arranged corresponding to the circulation opening (340), and a plurality of the circulation opening (340), the supporting air channel (341) and the sealing tile (350) being arranged in a circumferential array; When the container end cover and the cylinder tend to separate, there is a distance between the sealing tile (350) and the flow opening (340), and the flow opening (340) is unobstructed; When the inner ring body (130) is compressed, the active folding portion (320) is pressed and fitted with the sealing tile (350), and the flow opening (340) is blocked by the sealing tile (350).

9. The special rubber sealing ring for a nuclear power plant according to claim 6, characterized in that: The surfaces of the sealing ring body (110), the outer ring body (120), the inner ring body (130), the bracket ring (310) and the support ring (360) are all covered with an anti-corrosion coating.

10. A method for preparing a special rubber sealing ring for a nuclear power plant, for preparing the special rubber sealing ring for a nuclear power plant according to any one of claims 1 to 9, characterized in that: include: S1. Refining mixed rubber, selecting a variety of rubber base materials and adding antioxidants and flame retardants during mixing; S2, injection molding, prepare multiple sets of detachable mold cores, inject the mixed rubber into the mold, and pressurize it in stages; S3, embedding functional components, embedding pre-set expanded graphite particles (240) and heat transfer copper sheets (250) during the vulcanization process, and utilizing the viscosity of the rubber when it is not fully cured to achieve interface sealing; S4. Finish the surface, trim the burrs on the edge of the sealing ring, and spray anti-corrosion coating.

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