Nuclear reactor pressure vessel sealing structure

Abstract

The invention relates to a nuclear reactor pressure vessel sealing structure, and belongs to the technical field of nuclear power plant reactor pressure vessel sealing. The nuclear reactor pressure vessel sealing structure is applied to a nuclear reactor pressure vessel and comprises an elastic body, a middle body and a sealing body, and the elastic body is constructed to be of a hollow structure distributed along an annular track; the intermediate body coats the outer surface of the elastic body; the sealing bodies are connected to the surface, away from the elastic body, of the middle body and arranged at the two ends of the middle body in the first direction, and the first direction is perpendicular to the plane where the annular track is located. The nuclear reactor pressure vessel sealing structure provided by the invention at least solves the problems of insufficient sealing reliability and single use environment in related technologies.

Description

Technical Field

[0001] This application relates to the technical field of the sealing technology of nuclear power plant reactor pressure vessels, and particularly to a sealing structure for nuclear reactor pressure vessels. Background Art

[0002] In a nuclear power plant, a nuclear reactor pressure vessel is the main reactor coolant pressure boundary and the second barrier to prevent the release of fission products. As an important part of the primary loop containment boundary, the pressure vessel needs to achieve the sealing of the internal medium of the vessel under operating conditions and various accident conditions, so as to prevent radioactive media from leaking from the sealing boundary to the environment outside the pressure vessel, causing unacceptable personnel irradiation damage and activation of equipment outside the reactor.

[0003] The sealing structure of the nuclear reactor pressure vessel in the related art usually needs to apply a large line load to improve the sealing performance after rebound, and there is still room for improvement in reliability. Summary of the Invention

[0004] Based on this, in view of the problems of insufficient reliability and single application range of the sealing structure of the nuclear reactor pressure vessel in the related art, it is necessary to provide a sealing structure for nuclear reactor pressure vessels.

[0005] The embodiment of this application provides a sealing structure for a nuclear reactor pressure vessel, which is applied to a nuclear reactor pressure vessel. The sealing structure of the nuclear reactor pressure vessel includes an elastomer, an intermediate body, and a sealing body. Among them, the elastomer is configured as a hollow structure distributed along an annular track; the intermediate body is coated on the outer surface of the elastomer; the sealing body is connected to the surface of the intermediate body facing away from the elastomer and is arranged at both ends of the intermediate body along a first direction, and the first direction is perpendicular to the plane where the annular track is located.

[0006] In the technical solution of the embodiment of this application, by setting the sealing body to be connected to the surface of the intermediate body facing away from the elastomer and arranging it at both ends of the intermediate body corresponding to the first direction, such a structure enables the sealing structure of the nuclear reactor pressure vessel to form a linear seal with the flange through the sealing body, reducing the correlation between the sealing performance of the sealing structure of the nuclear reactor pressure vessel and the line load applied externally. Furthermore, the requirement for the line load applied to the sealing structure of the nuclear reactor pressure vessel during installation can be reduced. And when the main bolt deforms under the action of the internal pressure of the pressure vessel, the sealing body is more likely to maintain line-sealing contact with the flange under the rebound action of the sealing structure of the nuclear reactor pressure vessel, thereby improving the reliability of the sealing structure of the nuclear reactor pressure vessel.

[0007] In some embodiments, grooves are provided at the positions of the intermediate body corresponding to the sealing bodies, and the sealing bodies are arranged in the grooves and protrude from the grooves. Such a design can use the grooves to provide positioning for the sealing bodies, reducing the possibility of the sealing bodies slipping on the surface of the intermediate body.

[0008] In some embodiments, the groove is a circular groove, a rectangular groove or a conical groove. That is, the appropriate groove shape can be selected according to the specifications and usage environment of the nuclear reactor pressure vessel sealing structure, and then the structure of the seal body can be designed as needed, with higher reliability.

[0009] In some embodiments, in the first direction, the seal body includes a first part disposed in the groove and a second part protruding from the groove; the maximum thickness dimension of the first part in the first direction is not greater than the maximum thickness dimension of the second part in the first direction. Such a design can further improve the sealing engagement between the seal body and the flange, with higher reliability.

[0010] In some embodiments, the seal body is adhesively fixed to the intermediate body. This can improve the freedom in the production of the nuclear reactor pressure vessel sealing structure, and different seal bodies and intermediate bodies can be selected for connection as needed to meet the requirements of different nuclear reactor pressure vessel sealing structure settings.

[0011] In some embodiments, the seal body is welded and fixed to the intermediate body. This can further improve the structural consistency between the seal body and the intermediate body, with higher reliability.

[0012] In some embodiments, the elastomer is a spring, and the coils of the spring are tightly wound and connected end to end.

[0013] In some embodiments, the thickness dimension of the part of the seal body protruding from the groove in the first direction is greater than the compression amount of the seal body after being pressurized. Such a design can ensure that there is always a part of the structure of the seal body protruding from the groove after being pressurized. Furthermore, the nuclear reactor pressure vessel sealing structure can form a line sealing contact with the flange through the protruding part of the seal body, further reducing the risk of seal failure between the nuclear reactor pressure vessel sealing structure and the flange after being pressurized, with higher reliability.

[0014] In some embodiments, the seal body is configured to have a structure made of graphite or silver. This can adapt to different sealing media and improve the sealing effect between the seal body and the flange under different operating environments, with higher reliability.

[0015] In some embodiments, the intermediate body is provided with an annular hollow area, and the annular hollow area is located at the inner ring position of the intermediate body corresponding to the elastomer. In this way, the intermediate body forms a structure in the shape of the letter "C", which can reduce the wire load of the spring and has better resilience performance, further improving the sealing engagement between the seal body and the flange, with higher reliability.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the specific embodiments of this application are given below. Brief Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a schematic cross-sectional structure diagram of the sealing structure of a nuclear reactor pressure vessel provided in an embodiment of this application;

[0019] Figure 2 It is Figure 1 An enlarged view of part A of the nuclear reactor pressure vessel sealing structure shown;

[0020] Figure 3 It is Figure 1 A cross-sectional view of the nuclear reactor pressure vessel sealing structure shown along line B-B;

[0021] Figure 4 It is Figure 2 An enlarged view of part C of the nuclear reactor pressure vessel sealing structure shown.

[0022] Description of the reference numerals: 100, nuclear reactor pressure vessel sealing structure; 10, elastomer; 20, intermediate body; 21, groove; 22, annular hollow area; 30, seal body; 31, first part; 32, second part; X, first direction. Detailed Embodiments

[0023] In order to make the above objects, features and advantages of this application more obvious and understandable, the following will give a detailed description of the specific embodiments of this application in conjunction with the drawings. Many specific details are set forth in the following description in order to fully understand this application. However, this application can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of this application. Therefore, this application is not limited by the specific embodiments disclosed below.

[0024] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0025] In addition, if there is a term "and / or", "and / or" is merely an associative relationship describing associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship. If there are terms such as "first" and "second", these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if there is a term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present application, unless otherwise clearly specified and limited, if there are terms such as "install", "connect", "couple", "fix", etc., these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0027] In the present application, unless otherwise clearly specified and limited, if there is a description such as a first feature being "on" or "under" a second feature, the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0028] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for illustrative purposes and do not represent the only implementation.

[0029] In a nuclear power plant, the nuclear reactor pressure vessel is the main reactor coolant pressure boundary and the second barrier to prevent the release of fission products. As an important part of the primary circuit containment boundary, the pressure vessel needs to achieve the sealing of the internal medium under operating conditions and various accident conditions to prevent radioactive media from leaking from the sealing boundary to the environment outside the pressure vessel, causing unacceptable personnel irradiation damage and activation of off-site equipment.

[0030] The nuclear reactor pressure vessel sealing structure is usually arranged on the sealing surface between the top cover and the cylinder body of the pressure vessel. Through the extrusion between the flange of the top cover and the flange of the cylinder body (the main bolts connect the two flanges), the connection relationship between the nuclear reactor pressure vessel sealing structure and the flange is converted from a point connection relationship to a line sealing relationship. That is to say, as the main bolts are gradually tightened, the distance between the two flanges gradually decreases and the nuclear reactor pressure vessel sealing structure arranged between them is extruded, prompting the nuclear reactor pressure vessel sealing structure to undergo deformation compression under the action of the line load, and enabling the nuclear reactor pressure vessel sealing structure to form a ring-shaped line sealing contact with the two flanges respectively, thereby sealing the pressure vessel.

[0031] However, under the working conditions of the nuclear reactor, the changes in the temperature and pressure environment inside the pressure vessel will cause the main bolts to deform. Correspondingly, the nuclear reactor pressure vessel sealing structure will also rebound accordingly to maintain the line sealing contact with the flange. When the rebound deformation of the nuclear reactor pressure vessel sealing structure cannot match the deformation of the main bolts, it is very likely to cause the sealing surface to fail.

[0032] Based on this, related technologies usually have relatively high requirements for the size of the main bolts and the thickness of the flanges, so as to apply a greater line load to the nuclear reactor pressure vessel sealing structure during the installation stage of the nuclear reactor pressure vessel sealing structure. On the one hand, it reduces the deformation amount of the main bolts during the working stage, and on the other hand, it can also increase the rebound amount of the nuclear reactor pressure vessel sealing structure during the working stage, thus improving the sealing performance of the nuclear reactor pressure vessel sealing structure. As for the structure of the nuclear reactor pressure vessel sealing structure itself, there is still room for improvement in its reliability.

[0033] Please refer to Figures 1 to 4, an embodiment of the present application provides a sealing structure 100 for a nuclear reactor pressure vessel, which is applied to a nuclear reactor pressure vessel. The sealing structure 100 for a nuclear reactor pressure vessel includes an elastomer 10, an intermediate body 20, and a sealing body 30. Among them, the elastomer 10 is configured as a hollow structure distributed along an annular track; the intermediate body 20 is coated on the outer surface of the elastomer 10; the sealing body 30 is connected to the surface of the intermediate body 20 facing away from the elastomer 10 and is arranged at both ends of the intermediate body 20 along the first direction X, and the first direction X is perpendicular to the plane where the annular track is located.

[0034] The sealing structure 100 for a nuclear reactor pressure vessel is applied to a nuclear reactor pressure vessel to improve the sealing performance of the nuclear reactor pressure vessel and reduce the risk of radioactive medium leaking from the sealing boundary to the environment outside the pressure vessel. Specifically, the sealing structure 100 for a nuclear reactor pressure vessel can be arranged at the sealing surface between the top cover and the cylinder body of the nuclear reactor pressure vessel, that is, between the flanges used to connect and fasten the top cover and the cylinder body.

[0035] The elastomer 10 is the main elastic member in the sealing structure 100 for a nuclear reactor pressure vessel. When the top cover and the cylinder body are connected, it bears a certain linear load and deforms, and the contact pressure between the sealing structure 100 for a nuclear reactor pressure vessel and the flange is increased through the resilience of the elastomer 10, thereby forming a good linear sealing contact.

[0036] The elastomer 10 is configured as a hollow structure distributed along an annular track to utilize the hollow part of the elastomer 10 to provide space for the deformation of the elastomer 10 under external pressure. The elastomer 10 is configured to be distributed along an annular track to form an annular sealing structure on the flange at the position of the flange of the top cover or the open end of the cylinder body, so as to reduce the risk of radioactive substance leakage in the pressure vessel in all directions.

[0037] In these embodiments of the present application, the annular track can be selected according to the structure of the pressure vessel, specifically, it can be selected according to the shapes of the top cover and the open end of the cylinder body to adapt to the structure of the pressure vessel and provide a complete sealing effect. Exemplarily, in an embodiment where the shape of the open end of the cylinder body is circular, the annular track can be set as a circular ring, and in an embodiment where the shape of the open end of the cylinder body is rectangular, the annular track can also be set as a rectangular shape.

[0038] When the sealing structure 100 for a nuclear reactor pressure vessel is installed between the top cover and the cylinder body, the elastomer 10 can be further deformed and compressed under external pressure to compensate for the overall deformation of the sealing structure 100 for a nuclear reactor pressure vessel. During the working stage of the pressure vessel, as the internal pressure of the pressure vessel gradually increases, the pressure acting on the elastomer 10 gradually decreases, and the elastomer 10 can gradually rebound and always maintain a good linear sealing contact between the sealing structure 100 for a nuclear reactor pressure vessel and the flange.

[0039] The intermediate body 20 is coated and disposed on the outer surface of the elastomer 10. In these embodiments of the present application, the inner surface size of the intermediate body 20 can be set to be the same as the outer surface size of the elastomer 10 so that the intermediate body 20 is in close contact with the elastomer 10.

[0040] The setting of the intermediate body 20 can flatten the outer surface of the elastomer 10 and can provide protection for the elastomer 10 by coating the elastomer 10. In these embodiments of the present application, the material of the intermediate body 20 can be, but is not limited to, a ferrous alloy, a chromium-based alloy or a nickel-based alloy.

[0041] The seal body 30 is disposed at both ends of the intermediate body 20 corresponding to the first direction X, and the first direction X is perpendicular to the plane where the annular trajectory is located. Among them, the two ends of the nuclear reactor pressure vessel sealing structure 100 along the first direction X are respectively the contact positions with the flange of the top cover and the flange of the cylinder body. The seal body 30 is disposed at both ends of the nuclear reactor pressure vessel sealing structure 100 along the first direction X, that is, the seal body 30 is used as the contact member between the nuclear reactor pressure vessel sealing structure 100 and the upper and lower flanges.

[0042] The seal body 30 is connected to the surface of the intermediate body 20 facing away from the elastomer 10 so that the seal body 30 can protrude from the outer surface of the intermediate body 20. During the installation stage of the nuclear reactor pressure vessel sealing structure 100, when the flanges of the top cover and the cylinder body are gradually tightened by the main bolts, the seal body 30 first contacts the upper and lower flanges, and gradually develops from point contact to line contact, thereby forming a good sealing structure.

[0043] The seal body 30 and the intermediate body 20 can be connected by bonding, welding or even integral molding to improve the structural stability between the seal body 30 and the intermediate body 20 and reduce the possibility of the seal body 30 slipping relative to the intermediate body 20 when the nuclear reactor pressure vessel sealing structure 100 is subjected to external pressure.

[0044] The first direction X is perpendicular to the plane where the annular trajectory is located. Since during the installation process of the nuclear reactor pressure vessel sealing structure 100, the plane where the annular trajectory of the elastomer 10 is located is parallel to the contact surfaces of the upper and lower flanges, setting the first direction X perpendicular to the plane where the annular trajectory is located can ensure that the seal body 30 is the member in contact with the upper and lower flanges during the installation process of the nuclear reactor pressure vessel sealing structure 100. In this way, the contact area between the nuclear reactor pressure vessel sealing structure 100 and the upper and lower flanges can be reduced, so that during each working stage of the pressure vessel, the nuclear reactor pressure vessel sealing structure 100 and the upper and lower flanges always maintain line-sealed contact, reducing the risk of forming an unstable surface contact between the nuclear reactor pressure vessel sealing structure 100 and the upper and lower flanges.

[0045] Further, due to the setting of the seal 30, the sealing performance between the nuclear reactor pressure vessel sealing structure 100 and the upper and lower flanges is improved at the structural level. Therefore, during the installation stage of the nuclear reactor pressure vessel sealing structure 100, it is not necessary to apply too large a linear load to the nuclear reactor pressure vessel sealing structure 100. The nuclear reactor pressure vessel sealing structure 100 can always achieve linear sealing contact with the upper and lower flanges through the seal body 30 during the springback process, which is beneficial to optimizing the structural design of the nuclear reactor pressure vessel sealing structure 100.

[0046] In the technical solution of the embodiment of the present application, the seal body 30 is arranged on the surface of the intermediate body 20 facing away from the elastic body 10 and is arranged at both ends of the intermediate body 20 along the first direction X. Such a structure enables the nuclear reactor pressure vessel sealing structure 100 and the flange to form a linear seal through the seal body 30, reducing the correlation between the sealing performance of the nuclear reactor pressure vessel sealing structure 100 and the externally applied linear load. Therefore, the requirement for the linear load applied to the nuclear reactor pressure vessel sealing structure 100 during installation can be reduced. And when the main bolt deforms under the action of the internal pressure of the pressure vessel, the seal body 30 is more likely to maintain linear sealing contact with the flange under the springback action of the nuclear reactor pressure vessel sealing structure 100, thereby improving the reliability of the nuclear reactor pressure vessel sealing structure 100.

[0047] In some embodiments, a groove 21 is provided at the position of the intermediate body 20 corresponding to the seal body 30, and the seal body 30 is arranged in the groove 21 and protrudes from the groove 21.

[0048] By providing the groove 21 at the position of the intermediate body 20 corresponding to the seal body 30 and arranging the seal body 30 in the groove 21, the groove 21 can provide a positioning effect for the seal body 30, reducing the risk of relative slip between the seal body 30 and the intermediate body 20 when the seal body 30 is subjected to external pressure (the outer surface of the intermediate body 20 is an arc-shaped surface, and when the external force direction deviates, it may cause the seal body 30 to slip relative to the intermediate body 20).

[0049] The seal body 30 protruding from the groove 21 means that the seal body 30 is arranged in the groove 21 to utilize the groove 21 to provide positioning for the seal body 30, and a part of the structure of the seal body 30 protrudes from the opening of the groove 21 to contact the upper and lower flanges. Such a design can utilize the groove 21 to provide positioning for the arrangement of the seal body 30, reducing the possibility of the seal body 30 slipping on the surface of the intermediate body 20.

[0050] In some embodiments, the groove 21 can be, but is not limited to, a circular groove, a rectangular groove, or a conical groove. That is, the shape of the groove 21 can be selected according to the specifications and usage environment of the nuclear reactor pressure vessel sealing structure 100, and then the structure of the seal body 30 can be designed as needed, with higher reliability.

[0051] Since the structural dimensions of the nuclear reactor pressure vessel sealing structure 100 are usually large, in these embodiments of the present application, the shape of the groove 21 can be freely designed according to factors such as processing conditions, the application environment of the nuclear reactor pressure vessel sealing structure 100, and the installation conditions of the seal body 30 and the intermediate body 20, so as to obtain an optimal production strategy.

[0052] In some embodiments, in the first direction X, the seal body 30 includes a first portion 31 disposed within the groove 21 and a second portion 32 protruding from the groove 21; the maximum thickness dimension L1 of the first portion 31 in the first direction X is not greater than the maximum thickness dimension L2 of the second portion 32 in the first direction X.

[0053] That is to say, the portion of the seal body 30 disposed outside the groove 21 is more than the portion disposed within the groove 21. On the premise of ensuring that the groove 21 can provide sufficient positioning performance for the seal body 30, the dimension of the portion of the seal body 30 disposed outside the groove 21 is further increased. Such a design can further enhance the sealing engagement between the seal body 30 and the flange, with higher reliability.

[0054] In some embodiments, the seal body 30 and the intermediate body 20 are adhesively fixed. A possible implementation method is that the seal body 30 and the intermediate body 20 are respectively formed, and the seal body 30 is selected and then assembled in the assembly process. Exemplarily, in the forming stage, the seal body 30 structures of different materials can be first formed, such as the seal body 30 made of nickel-based alloy, the seal body 30 made of iron-based alloy, and the seal body 30 made of chromium-based alloy, and stored separately. During the assembly process of the nuclear reactor pressure vessel sealing structure 100, after the material of the seal body 30 is selected according to the type of the sealing medium of the nuclear reactor, the seal body 30 of the corresponding material and the intermediate body 20 are adhesively bonded through an adhesive to improve the freedom during the production of the nuclear reactor pressure vessel sealing structure 100, and different seal bodies 30 and intermediate bodies 20 can be selected as needed for connection to meet the setting requirements of different nuclear reactor pressure vessel sealing structures 100.

[0055] In some embodiments, the seal body 30 and the intermediate body 20 are welded and fixed. To further improve the structural consistency between the seal body 30 and the intermediate body 20, with higher reliability.

[0056] In these embodiments of the present application, the elastomer 10 is a spring, and the coils of the spring are closely wound and joined end to end, thus forming the aforementioned annular and hollow elastomer 10. Using the elastomer 10 as the main structure of the nuclear reactor pressure vessel sealing structure 100 can further increase the linear load that the elastomer 10 can bear, with better reliability.

[0057] It should be noted that in the present application, by arranging the sealing bodies 30 at both ends of the intermediate body 20 along the first direction X, the performance of the nuclear reactor pressure vessel sealing structure 100 in the sealing stage can be improved by using the sealing bodies 30. Based on this, in these embodiments of the present application, the wire diameter of the elastomer 10 can be adjusted according to the needs of the sealing environment, reducing the requirement for the linear load of the spring used as the elastomer 10.

[0058] In some embodiments, the thickness dimension of the part of the sealing body 30 protruding from the groove 21 in the first direction X is greater than the compression amount of the sealing body 30 after bearing pressure.

[0059] In the assembly stage of the pressure vessel, the main bolts need to be installed in the bolt holes of the top cover flange of the pressure vessel first. Generally, an external force is directly applied to the bolts by using a hydraulic cylinder to stretch the main bolts within their elastic deformation range to a certain extent, and the main bolts are pre-tightened by means of micro displacement or deformation. Then, a torque wrench is used to control the tightening force of the main bolts. During the pre-tightening and tightening of the main bolts, the nuclear reactor pressure vessel sealing structure 100 arranged between the two flanges will deform due to the compressive load. For example, the cross-sections of the elastomer 10 and the intermediate body 20 will change from circular to elliptical. At the same time, the thickness dimension of the sealing body 30 in the first direction X will also decrease due to the compressive load.

[0060] The thickness dimension of the part of the sealing body 30 protruding from the groove 21 in the first direction X is greater than the compression amount of the sealing body 30 after bearing pressure, so that there is always a part of the structure of the sealing body 30 outside the groove 21 after compression and is used to contact the flange to form a line seal contact.

[0061] In these embodiments of the present application, the sealing body 30 can be, but is not limited to, configured as a structure made of graphite or silver, so that the sealing body 30 has appropriate hardness and can deform when subjected to an external pressure load to form a line seal contact with the flange. At the same time, it will not be completely compressed into the groove 21 due to too large a compression rate, further improving the sealing reliability of the nuclear reactor pressure vessel sealing structure 100.

[0062] That is to say, such a design enables part of the structure of the seal body 30 to always protrude from the groove 21 after being pressurized. Furthermore, the nuclear reactor pressure vessel sealing structure 100 can form a line sealing contact with the flange through the protruding part of the seal body 30, further reducing the risk of seal failure between the nuclear reactor pressure vessel sealing structure 100 and the flange after being pressurized, and having higher reliability.

[0063] Furthermore, in some embodiments, the material of the seal body 30 can also be selected according to the different working environments of the nuclear reactor pressure vessel sealing structure 100 to adapt to different sealing media, improving the sealing effect between the seal body 30 and the flange under different operating environments, and having higher reliability.

[0064] In some embodiments, the intermediate body 20 is provided with an annular hollow area 22, and the annular hollow area 22 is located at the inner ring position of the intermediate body 20 corresponding to the elastomer 10. The setting of the annular hollow area 22 can further improve the ability of the nuclear reactor pressure vessel sealing structure 100 to undergo thermal expansion or mechanical deformation under working environments with different temperatures and pressures, better adapting to various working environments of the pressure vessel and being able to maintain good sealing performance.

[0065] At the same time, making the intermediate body form a structure in the shape of the letter "C" in this way can reduce the wire load of the spring, have better resilience performance, and further improve the sealing engagement between the seal body and the flange, with higher reliability.

[0066] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0067] The above-described embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A sealing structure for a nuclear reactor pressure vessel, which is applied to, and is characterized in that, Comprising: An elastomer, configured as a hollow structure distributed along an annular trajectory; An intermediate body, coated and disposed on the outer surface of the elastomer; A sealing body, connected to the surface of the intermediate body facing away from the elastomer, and disposed at both ends of the intermediate body along a first direction, the first direction being perpendicular to the plane where the annular trajectory is located.

2. The sealing structure of the nuclear reactor pressure vessel according to claim 1, characterized in that The intermediate body is provided with grooves corresponding to the positions of the sealing bodies, and the sealing bodies are disposed in the grooves and protrude from the grooves.

3. The sealing structure of the nuclear reactor pressure vessel according to claim 2, characterized in that, The grooves are circular grooves, rectangular grooves or conical grooves.

4. The sealing structure of the nuclear reactor pressure vessel according to claim 2, characterized in that, In the first direction, the sealing body includes a first part disposed in the groove and a second part protruding from the groove; The maximum thickness dimension of the first part in the first direction is not greater than the maximum thickness dimension of the second part in the first direction.

5. The sealing structure of the nuclear reactor pressure vessel according to claim 1, characterized in that The sealing body is adhesively fixed to the intermediate body.

6. The sealing structure of the nuclear reactor pressure vessel according to claim 1, characterized in that The sealing body is welded and fixed to the intermediate body.

7. The sealing structure of a nuclear reactor pressure vessel according to any one of claims 2 to 6, characterized in that, The thickness dimension of the part of the sealing body protruding from the groove in the first direction is greater than the compression amount of the sealing body after bearing pressure.

8. The sealing structure of the nuclear reactor pressure vessel according to any one of claims 1 to 6, characterized in that, The elastomer is a spring, and the coils of the spring are closely arranged and connected end to end.

9. The nuclear reactor pressure vessel sealing structure according to any one of claims 1 to 6, characterized in that, The sealing body is configured as a structure made of graphite or silver.

10. The nuclear reactor pressure vessel sealing structure according to any one of claims 1 to 6, characterized in that, The intermediate body is provided with an annular hollow area, and the annular hollow area is located at the inner ring position of the intermediate body corresponding to the elastomer.

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