Sealing structure assembly and penetration piece

Abstract

The utility model discloses a sealing structure assembly and a penetration piece. The sealing structure assembly is used for being installed in a feed-through hole. The feed-through hole sequentially comprises an internal thread section and a first inclined section from outside to inside, the sealing structure assembly comprises a sealing thread piece, a guide pressing ring and an extrusion sealing ring which are sequentially and tightly matched from outside to inside, and the sealing thread piece comprises an external thread section matched with the internal thread section; a first through hole is formed in the sealing threaded part; one end, close to the guide pressing ring, of the first through hole comprises a second inclined section; the end, close to the sealing threaded piece, of the guide pressing ring comprises a third inclined section in close contact with the second inclined section. The end, close to the extrusion sealing ring, of the second through hole comprises a fourth inclined section. The end, close to the guide pressing ring, of the extrusion sealing ring comprises a sixth inclined section in close contact with the fourth inclined section, and the end, away from the guide pressing ring, of the extrusion sealing ring comprises a seventh inclined section in close contact with the first inclined section. The sealing performance among the sealing structure assembly, the penetrating core rod and the feed-through hole is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of communication equipment for nuclear power plants, and in particular to a sealed structure component and a through-hole component. Background Technology

[0002] Electrical penetrations are installed on the reactor containment vessel, providing electrical connections through it. As part of the containment vessel, they also form a third barrier to prevent the leakage of radioactive materials, protecting its integrity. Therefore, the sealing performance of these penetrations is directly related to nuclear safety.

[0003] According to the standards GB / T 13538-2017 "Electric Penetration Assemblies in Containment Structures for Nuclear Power Generating Stations" and IEEE 317-2013 "Electric Penetration Assemblies in Containment Structures for Nuclear Power Generating Stations", the gas leakage rate of the penetration assembly should be ≤1.0×10-4 Pa·m3 / s (0.25MPa nitrogen). With the advancement of technology and the increasingly stringent nuclear safety requirements, most current nuclear power plants no longer meet the above requirements and have put forward higher requirements of ≤1.0×10-7 Pa·m3 / s for the gas leakage rate. Therefore, it is extremely necessary to design a sealing element with higher sealing performance and a penetration element that can meet the higher requirements of nuclear power plants for the gas leakage rate. Utility Model Content

[0004] The problem to be solved by this utility model is to provide a sealing structure component and a through-hole component.

[0005] In a first aspect, this utility model discloses a sealing structure assembly for installation in the feed hole of the end flange of a through-piece. The feed hole includes an internal thread section and a first inclined section in sequence from the outside to the inside, and the diameter of the first inclined section gradually decreases from the outside to the inside. The sealing structure assembly includes a sealing threaded part, a guide pressure ring and a compression sealing ring that are tightly fitted in sequence from the outside to the inside. The interior of the sealing structure assembly is used to set a through-piece mandrel.

[0006] The sealing threaded component has a first through hole inside. The sealing threaded component includes a force-applying section away from the end flange and an external thread section close to the end flange. The external thread section is used to mate with the internal thread section. The end of the first through hole close to the guide pressure ring includes a second inclined section. The diameter of the second inclined section gradually increases from the inside to the outside.

[0007] The guide ring has a second through hole inside. The end of the guide ring near the sealing thread includes a third inclined section, which is in close contact with the second inclined section. The end of the second through hole near the extrusion sealing ring includes a fourth inclined section, and the diameter of the fourth inclined section gradually increases from the inside to the outside.

[0008] The extrusion sealing ring has a third through hole inside that matches the diameter of the through mandrel. The end of the extrusion sealing ring near the guide ring includes a sixth inclined section that is in close contact with the fourth inclined section. The end of the extrusion sealing ring away from the guide ring includes a seventh inclined section that is in close contact with the first inclined section.

[0009] In some embodiments, the guide ring includes a fifth inclined segment at one end near the extrusion seal ring. The diameter of the fifth inclined segment gradually decreases from the direction away from the extrusion seal ring towards the extrusion seal ring. The fifth inclined segment is in close contact with the first inclined segment. The first inclined segment includes a first sub-segment and a second sub-segment. The distance between the second sub-segment and the internal thread segment is less than the distance between the first sub-segment and the internal thread segment. The first sub-segment is in close contact with the seventh inclined segment, and the second sub-segment is in close contact with the fifth inclined segment.

[0010] In some embodiments, a grease layer is provided on the surfaces of the third inclined section and the fourth inclined section of the guide ring.

[0011] In some embodiments, a high-vacuum silicone grease layer is provided on the surface of the sixth inclined segment of the extrusion sealing ring.

[0012] In some embodiments, an anti-seize agent layer is provided on the surface of the external threaded section of the sealing thread.

[0013] In some embodiments, the end flange is provided with a plurality of feed holes, and the sealing structure assembly is provided in a one-to-one correspondence with the feed holes. The sealing structure assembly without a through mandrel inside also includes a plug, which is simultaneously inserted into the first through hole, the second through hole and the third through hole, and the diameter of the plug is adapted to the diameter of the third through hole.

[0014] In some embodiments, the first through hole further includes a first main body segment connected to the second inclined segment, and the second through hole further includes a second main body segment connected to the fourth inclined segment, wherein the diameter of the first main body segment is greater than the diameter of the second main body segment and the diameter of the third through hole.

[0015] In some embodiments, the hardness of the sealing thread and the guide ring is greater than the hardness of the extrusion sealing ring.

[0016] In some embodiments, the axes of the sealing thread, the guide ring, and the compression sealing ring are on the same straight line:

[0017] Secondly, this utility model discloses a through member, including a sleeve and an end flange fixedly connected to the end of the sleeve. The end flange is provided with a plurality of feed holes. The through member also includes the sealing structure assembly described in the first aspect. The plurality of sealing structure assemblies are respectively installed in the plurality of feed holes of the end flange.

[0018] The beneficial effects of this utility model are as follows: This utility model discloses a sealing structure assembly and a through-hole. The sealing structure assembly is installed in the feed hole of the end flange of the through-hole. The feed hole, from the outside to the inside, sequentially includes an internal thread section and a first inclined section, the diameter of which gradually decreases from the outside to the inside. The sealing structure assembly includes a sealing threaded component, a guide pressure ring, and a compression sealing ring that are tightly fitted sequentially from the outside to the inside. The interior of the sealing structure assembly is used to house a through-hole. The sealing threaded component has a first through-hole and includes a force-applying section away from the end flange and an external threaded section close to the end flange. The external threaded section is used to mate with the internal threaded section. The first through-hole is close to... One end of the guide ring includes a second inclined section, the diameter of which gradually increases from the inside to the outside. The guide ring has a second through hole inside. The end of the guide ring near the sealing thread includes a third inclined section, which is in close contact with the second inclined section. The end of the second through hole near the compression sealing ring includes a fourth inclined section, the diameter of which gradually increases from the inside to the outside. The compression sealing ring has a third through hole inside, the diameter of which matches that of the through mandrel. The end of the compression sealing ring near the guide ring includes a sixth inclined section, which is in close contact with the fourth inclined section. The end of the compression sealing ring away from the guide ring includes a seventh inclined section that is in close contact with the first inclined section. This design effectively improves the sealing performance between the sealing structure assembly and the feedthrough hole, between the sealing structure assembly and the through mandrel, and the sealing performance of the sealing structure assembly itself, thereby ensuring that the sealing performance of the through-piece meets the higher requirements of nuclear power plants for gas leakage rates. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a partial cross-sectional view of the through-hole component during installation, as provided in an embodiment of the present utility model.

[0021] Figure 2This is a partial cross-sectional view of the completed installation of the through-hole component provided in an embodiment of the present utility model;

[0022] Figure 3 A top view of the sealing threaded component in the sealing structure assembly provided in an embodiment of this utility model;

[0023] Figure 4 A partial cross-sectional schematic diagram of the sealing threaded component in the sealing structure assembly provided in this embodiment of the utility model;

[0024] Figure 5 A top view of the guide ring in the sealing structure assembly provided in this embodiment of the utility model;

[0025] Figure 6 A cross-sectional schematic diagram of the guide pressure ring in the sealing structure assembly provided in this embodiment of the utility model;

[0026] Figure 7 A top view of the extruded sealing ring in the sealing structure assembly provided in this embodiment of the utility model;

[0027] Figure 8 A cross-sectional schematic diagram of the extruded sealing ring in the sealing structure assembly provided in this embodiment of the utility model.

[0028] Reference numerals: 1. Sleeve; 2. End flange; 21. Feed hole; 211. Internal thread section; 212. First inclined section; 3. Sealing structure assembly; 31. Sealing threaded component; 311. Force application section; 312. External thread section; 313. First through hole; 3131. Second inclined section; 3132. First main body section; 32. Guide pressure ring; 321. Second through hole; 3211. Fourth inclined section; 3212. Second main body section; 322. Third inclined section; 323. Fifth inclined section; 33. Extrusion sealing ring; 331. Third through hole; 332. Sixth inclined section; 333. Seventh inclined section; 34. Plug; 341. Main body; 342. Limiting part; 4. Through mandrel; 41. Outer sheath; 42. Wire. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0030] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and, or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and, or collections thereof.

[0031] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, that component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0032] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0033] It should also be further understood that the terms "and" and "or" as used in this specification and the appended claims refer to any combination of one or more of the associated listed items and all possible combinations, and include such combinations.

[0034] like Figure 1 and Figure 2 As shown in the figure, this utility model embodiment discloses a through member, including a sleeve 1 and an end flange 2 fixedly connected to the end of the sleeve 1. The end flange 2 is provided with a plurality of feed holes. The through member also includes a plurality of sealing structure components 3, which are respectively installed in the plurality of feed holes 21 of the end flange 2.

[0035] In this embodiment, the penetrator can be an electrical penetrator or an optical fiber penetrator, used for installation on the reactor containment vessel to provide electrical or communication connectivity through the containment vessel. The penetrator may include a sleeve 1 and end flanges 2 fixedly connected to both ends of the sleeve 1. When the penetrator is installed on the containment vessel, one end is located outside the containment vessel, and the other end is located inside the containment vessel. The end flanges 2 have multiple feedthrough holes 21, with each feedthrough hole 21 on two end flanges 2 corresponding to the other. The two corresponding feedthrough holes 21 and the space inside the sleeve 1 form an installation channel. The penetrator also includes a penetrating core rod 4, which passes through the installation channel, allowing the core rod 4 to pass through the sleeve 1 of the penetrator. This results in one end of the core rod 4 being inside the containment vessel and the other end being outside the containment vessel, thus providing electrical or communication connectivity through the reactor containment vessel.

[0036] To meet the high gas leakage rate requirements of nuclear power plants, a sealing structure assembly 3 is installed at the location of the feedthrough hole 21 on the end flange 2 to improve the sealing performance of the penetration. The through-bar 4 passes through both the feedthrough hole 21 and the sealing structure assembly 3. The number of sealing structure assemblies 3 is the same as the number of feedthrough holes 21, meaning that a sealing structure assembly 3 is installed at the location of each feedthrough hole 21. The number of through-bar 4 is less than or equal to the number of feedthrough holes 21 on the end flange 2, meaning that some feedthrough holes 21 have through-bar 4 installed, while others do not. Of course, through-bar 4 can also be installed in all feedthrough holes 21. The specific number of through-bar 4 can be determined according to the requirements of electrical connection functions or communication connection functions.

[0037] Specifically, the penetrating core 4 may include an outer sheath 41 and a conductor 42 passing through the outer sheath 41. If the penetrating element is an electrical penetrating element, the conductor 42 is an electrical conductor; if the penetrating element is an optical fiber penetrating element, the conductor 42 is an optical fiber cable. The outer sheath 41 is made of a rigid material, such as stainless steel, so that when the operator installs the penetrating core 4, the penetrating core 4 can easily reach the feedthrough hole 21 at one end of the penetrating element from the feedthrough hole 21 at the other end, thereby improving installation efficiency. The outer side wall of the outer sheath 41 fits tightly with the inner side wall of the sealing structure assembly 3, and the outer side wall of the sealing structure assembly 3 fits tightly with the side wall of the feedthrough hole 21, thereby ensuring that the penetrating element meets the gas leakage rate requirements of the nuclear power plant. The nominal diameter of the outer sheath 41 may be 25.4 mm.

[0038] The sealing structure assembly 3 is used to be installed in the feed hole 21 of the end flange 2 of the through member. The feed hole 21 includes an internal thread section 211 and a first inclined section 212 in sequence from the outside to the inside. The diameter of the first inclined section 212 gradually decreases from the outside to the inside. The sealing structure assembly 3 includes a sealing threaded member 31, a guide pressure ring 32 and a compression sealing ring 33 that are tightly fitted in sequence from the outside to the inside. The interior of the sealing structure assembly 3 is used to set the through mandrel 4.

[0039] The "outside-inside" direction described above refers to the direction extending from both ends of the through member inwards. The internal threaded section 211 of the feed hole 21 is tightly fitted with the sealing threaded member 31 in the sealing structure assembly 3 to ensure the sealing between the feed hole 21 and the sealing structure assembly 3. The first inclined section 212 of the internal threaded section 211 of the feed hole 21 is used to tightly fit with the compression sealing ring 33 in the sealing structure assembly 3. The diameter of the first inclined section 212 gradually decreases from the outside to the inside, so that the compression sealing ring 33 is limited by the first inclined section 212 during the installation process from the outside to the inside, preventing the compression sealing ring 33 from loosening, thereby further ensuring the sealing between the feed hole 21 and the sealing structure assembly 3.

[0040] See also Figure 3 and Figure 4 In some embodiments, the sealing threaded component 31 has a first through hole 313 inside. The sealing threaded component 31 includes a force-applying section 311 away from the end flange 2 and an external thread section 312 close to the end flange 2. The external thread section 312 is used to cooperate with the internal thread section 211. The end of the first through hole 313 close to the guide pressure ring 32 includes a second inclined section 3131. The diameter of the second inclined section 3131 gradually increases from the inside to the outside.

[0041] The cross-section of the force-applying section 311 can be regular hexagonal. A torque wrench can be used to operate the force-applying section 311 to rotate the sealing thread 31 during installation or disassembly of the sealing structure assembly 3. The external thread section 312 is used to tightly engage with the internal thread section 211 of the feed hole 21. The diameter of the second inclined section 3131 gradually increases from the inside out; here, "from the inside out" of the second inclined section 3131 is relative to the first through hole 313 itself. When installing the sealing structure assembly 3, a driving force is applied to the hexagonal force application section 311 using a torque wrench. The sealing thread 31 is rotated outside the feed hole 21. While rotating, the sealing thread 31 moves axially into the feed hole 21. The sealing thread 31 pushes the guide pressure ring 32 and the compression sealing ring 33 to move axially into the feed hole 21 together. As the external thread section 312 of the sealing thread 31 gradually engages with the internal thread section 211 of the feed hole 21, the periphery of the sealing thread 31 is subjected to pressure from the end flange 2, causing the sealing thread 31 to undergo a slight inward compression deformation. This allows the pressure and driving force to be transmitted to the guide pressure ring 32 through the second inclined section 3131, thereby enabling the sealing thread 31 and the guide pressure ring 32 to fit tightly together, ensuring the sealing performance of the sealing thread 31 and the guide pressure ring 32. Specifically, the function of the second inclined section 3131, whose diameter gradually increases from the inside to the outside, is twofold. First, it facilitates the combination of the sealing threaded part 31 and the guide pressure ring 32 during installation, which is equivalent to setting an outward-facing installation port at one end of the first through hole 313. Second, it enables the sealing threaded part 31 to transmit radial and axial pressure to the guide pressure ring 32 when subjected to the driving force applied by the torque wrench and the pressure of the end flange 2. The radial pressure allows the sealing threaded part 31 and the guide pressure ring 32 to fit tightly together, while the axial pressure, in addition to ensuring a tight fit between the sealing threaded part 31 and the guide pressure ring 32, also pushes the guide pressure ring 32 to move axially.

[0042] See also Figure 5 and Figure 6 In some embodiments, the guide ring 32 has a second through hole 321 inside, and the end of the guide ring 32 near the sealing thread 31 includes a third inclined section 322, which is in close contact with the second inclined section 3131. The end of the second through hole 321 near the compression sealing ring 33 includes a fourth inclined section 3211, and the diameter of the fourth inclined section 3211 gradually increases from the inside to the outside.

[0043] In this configuration, because the diameter of the second inclined section 3131 of the first through hole 313 gradually increases from the inside out, the third inclined section 322 of the guide ring 32 is in close contact with the second inclined section 3131, meaning the surfaces of the third inclined section 322 and the second inclined section 3131 are tightly fitted. Specifically, the diameter of the third inclined section 322 gradually increases from the direction closest to the sealing thread 31 towards the direction furthest from the sealing thread 31. Therefore, the driving force applied to the sealing thread 31 by the torque wrench and the pressure from the end flange 2 are transmitted to the guide ring 32 through the second inclined section 3131 and the third inclined section 322. As the diameter of the third inclined section 322 gradually increases from the direction close to the sealing thread 31 to the direction away from the sealing thread 31, when the force acts on the surface of the third inclined section 322, an axial component force and a radial component force are generated. The axial component force pushes the guide pressure ring 32 to move axially into the feed hole 21, and the radial component force causes the guide pressure ring 32 to undergo a slight inward compression deformation. Thus, the force is transmitted to the compression sealing ring 33 through the fourth inclined section 3211 of the second through hole 321, thereby causing the guide pressure ring 32 to push the compression sealing ring 33 to move axially into the feed hole 21 and ensuring the sealing performance between the guide pressure ring 32 and the compression sealing ring 33. Specifically, the function of the fourth inclined section 3211, whose diameter gradually increases from the inside to the outside, is twofold. First, it facilitates the combination of the guide pressure ring 32 and the extrusion sealing ring 33 during installation, which is equivalent to setting an outward-facing installation port at one end of the second through hole 321. Second, it enables the guide pressure ring 32 to transmit radial and axial pressure to the extrusion sealing ring 33 when subjected to the force transmitted by the sealing thread 31. The radial pressure allows the guide pressure ring 32 and the extrusion sealing ring 33 to fit tightly together, while the axial pressure, in addition to ensuring a tight fit between the guide pressure ring 32 and the extrusion sealing ring 33, also pushes the extrusion sealing ring 33 to move axially.

[0044] See also Figure 7 and Figure 8 In some embodiments, the compression sealing ring 33 has a third through hole 331 inside that matches the diameter of the through mandrel 4. The end of the compression sealing ring 33 near the guide ring 32 includes a sixth inclined section 332, which is in close contact with the fourth inclined section 3211. The end of the compression sealing ring 33 away from the guide ring 32 includes a seventh inclined section 333 that is in close contact with the first inclined section 212.

[0045] The through-hole 4 passes through the first through-hole 313, the second through-hole 321, and the third through-hole 331. Since the diameter of the fourth inclined section 3211 of the guide ring 32 gradually increases from the inside out, the sixth inclined section 332 of the compression sealing ring 33 is in close contact with the fourth inclined section 3211, meaning the surfaces of the sixth inclined section 332 and the fourth inclined section 3211 are tightly fitted. That is, the diameter of the sixth inclined section 332 gradually increases from the direction closer to the guide ring 32 towards the direction farther from the guide ring 32. Therefore, the force on the guide ring 32 is transmitted to the compression sealing ring 33 through the fourth inclined section 3211 and the sixth inclined section 332. As the diameter of the sixth inclined section 332 gradually increases from the direction close to the guide pressure ring 32 to the direction away from the guide pressure ring 32, when the force acts on the surface of the sixth inclined section 332, an axial component force and a radial component force are generated. The axial component force pushes the extrusion sealing ring 33 to move axially into the feed hole 21, and the radial component force causes the extrusion sealing ring 33 to undergo a slight inward deformation. Thus, the force is transmitted to the extrusion sealing ring 33 through the fourth inclined section 3211 of the second through hole 321, thereby ensuring the sealing performance between the guide pressure ring 32 and the extrusion sealing ring 33. Furthermore, since the seventh inclined segment 333 of the extrusion sealing ring 33 is in close contact with the first inclined segment 212 of the feed hole 21, that is, the surfaces of the seventh inclined segment 333 and the first inclined segment 212 are in close contact, and the diameter of the first inclined segment 212 gradually decreases from the outside to the inside, that is, the diameter of the seventh inclined segment 333 gradually decreases from the direction close to the guide pressure ring 32 to the direction away from the guide pressure ring 32, when the extrusion sealing ring 33 moves axially into the feed hole 21 to the limit, the feed hole 21 limits the extrusion sealing ring 33, thereby ensuring the sealing performance between the extrusion sealing ring 33 and the feed hole 21. Furthermore, as the compression sealing ring 33 gradually moves under the external driving force, it compresses the side wall of the feed hole 21. The feed hole 21 applies a reaction force to the compression sealing ring 33 through the first inclined section 212 and the seventh inclined section 333. This reaction force acting on the surface of the seventh inclined section 333 will generate an axial component force and a radial component force. The axial component force is opposite in direction to the axial component force received by the sixth inclined section 332, thereby further making the compression sealing ring 33, the guide pressure ring 32, and the sealing thread 31 fit tightly together. The radial component force and the axial component force received by the sixth inclined section 332 together cause the compression sealing ring 33 to produce a slight inward deformation, thereby forming a tight fit between the inner wall of the third through hole 331 of the compression sealing ring 33 and the outer wall of the penetrating mandrel 4. Specifically, it can be the outer wall of the outer sheath 41 of the penetrating mandrel 4, thereby ensuring the sealing performance between the compression sealing ring 33 and the penetrating mandrel 4.It should be noted that, since nuclear power plants need to regularly inspect and replace equipment, in order to ensure sealing while also facilitating installation and disassembly, the diameter of the third through hole 331 of the compression sealing ring 33 is adapted to the diameter of the through core rod 4, but not exactly equal. Rather, the diameter of the third through hole 331 is slightly larger than the diameter of the through core rod 4. For example, in one embodiment, the diameter of the third through hole 331 is 25.5 mm, while the diameter of the outer sheath tube 41 of the through core rod 4 is 25.4 mm.

[0046] As described above, this embodiment of the invention provides a sealing structure assembly 3 between the through-hole 4 and the feed hole 21. The feed hole 21 includes an internal thread section 211 and a first inclined section 212. The sealing structure assembly 3 includes a sealing threaded member 31, a guide pressure ring 32, and a compression sealing ring 33 arranged sequentially. Corresponding inclined sections are provided at the points where the sealing threaded member 31, the guide pressure ring 32, and the compression sealing ring 33 contact each other. Therefore, when applying torque to the sealing threaded member 31 to install the sealing structure assembly 3, the sealing threaded member 31 can be lifted. The sealing performance between the guide pressure ring 32 and the compression sealing ring 33, the sealing performance between the sealing structure component 3 and the feed hole 21, and the sealing performance between the sealing structure component 3 and the through core rod 4 are all achieved, thereby meeting the higher requirements of nuclear power plants for the gas leakage rate of the through-piece. After testing, the gas leakage rate of the through-piece provided by this utility model embodiment can reach ≤1.0×10-8Pa.m3 / s (0.25MPa nitrogen), which meets the leakage rate index requirements of the through-piece of various nuclear power plants (≤1.0×10-7Pa.m3 / s).

[0047] See also Figure 5 and Figure 6 In some embodiments, the guide ring 32 near the compression sealing ring 33 includes a fifth inclined segment 323. The diameter of the fifth inclined segment 323 gradually decreases from the direction away from the compression sealing ring 33 to the direction closer to the compression sealing ring 33. The fifth inclined segment 323 is in close contact with the first inclined segment 212. The first inclined segment 212 includes a first sub-segment and a second sub-segment. The distance between the second sub-segment and the internal thread segment 211 is less than the distance between the first sub-segment and the internal thread segment 211. The first sub-segment is in close contact with the seventh inclined segment 333, and the second sub-segment is in close contact with the fifth inclined segment 323.

[0048] In this embodiment, the guide ring 32 further includes a fifth inclined segment 323 whose diameter gradually decreases from away from the compression seal ring 33 to closer to the compression seal ring 33. The fifth inclined segment 323 is in close contact with the first inclined segment 212, that is, the surfaces of the fifth inclined segment 323 and the first inclined segment 212 are also in close contact. That is, the inclination angle of the fifth inclined segment 323 and the seventh inclined segment 333 of the compression seal ring 33 are the same. The first sub-segment of the first inclined segment 212 is in close contact with the seventh inclined segment 333, and the second sub-segment of the first inclined segment 212 is in close contact with the fifth inclined segment 323. That is, the contact position of the first inclined segment 212 and the fifth inclined segment 323 is not the same as the contact position of the first inclined segment 212 and the seventh inclined segment 333. The inclined surface length of the first inclined segment 212 is greater than or equal to the sum of the inclined surface lengths of the fifth inclined segment 323 and the seventh inclined segment 333. During the installation of the sealing structure assembly 3, the guide ring 32 presses against the sidewall of the feed hole 21. The guide ring 32 is also subjected to the reaction force applied by the feed hole 21, which generates radial pressure, causing the guide ring 32 to undergo a slight inward deformation. Even though the guide ring 32 is subjected to both the radial pressure transmitted by the sealing thread 31 and the radial pressure applied by the sidewall of the feed hole 21, and the fifth inclined section 323 is closer to the compression sealing ring 33 than the third inclined section 322, the force can be further transmitted through the fourth inclined section 3211 to the sixth inclined section 332 of the compression sealing ring 33, thereby increasing the radial pressure on the compression sealing ring 33, increasing its inward deformation, and thus improving its sealing performance with the through mandrel.

[0049] In some embodiments, in order to further improve the sealing performance between the guide ring 32 and the sealing thread 31 and the compression sealing ring 33, a grease layer is provided on the surface of the third inclined section 322 and the fourth inclined section 3211 of the guide ring 32.

[0050] The grease layer can be formed by uniformly applying grease to the surfaces of the third inclined section 322 and the fourth inclined section 3211 before installing the sealing structure on the feed hole 21, thereby sealing any gaps that may exist between the guide ring 32 and the sealing thread 31, such as gaps caused by dust on their surfaces.

[0051] In some embodiments, a high-vacuum silicone grease layer is provided on the surface of the sixth inclined segment 332 of the compression sealing ring 33.

[0052] The high-vacuum silicone grease layer can be formed by uniformly applying high-vacuum silicone grease to the surface of the sixth inclined section 332 before installing the sealing structure on the feed hole 21. The function of the high-vacuum silicone grease layer is to seal minor leakage points and further improve the sealing performance of the guide pressure ring 32 and the compression sealing ring 33.

[0053] In other embodiments, a high-vacuum silicone grease layer may also be provided on the surface of the seventh inclined segment 333 of the compression sealing ring 33.

[0054] In some embodiments, an anti-seize agent layer is provided on the surface of the external thread section 312 of the sealing thread 31.

[0055] Since nuclear power plants need to regularly inspect or replace equipment, while ensuring the sealing of the through-hole, it is also necessary to prevent the external thread section 312 of the sealing threaded part 31 from seizing with the internal thread section 211 of the feed hole 21 when disassembling the sealing structure assembly 3. Before installing the sealing structure on the feed hole 21, an anti-seizing agent can be applied to the surface of the external thread section 312 to avoid damage to the end flange 2 during disassembly and reduce the maintenance cost of the nuclear power plant.

[0056] See also Figure 1 and Figure 2 In some embodiments, the end flange 2 is provided with a plurality of feed holes 21, and the sealing structure assembly 3 is provided in a one-to-one correspondence with the feed holes 21. The sealing structure assembly 3 without the internal through mandrel 4 also includes a plug 34. The plug 34 is simultaneously inserted into the first through hole 313, the second through hole 321 and the third through hole 331, and the diameter of the plug 34 is adapted to the diameter of the third through hole 331.

[0057] In this embodiment, the end flange 2 is provided with multiple feed holes 21, and the sealing structure assembly 3 is provided in a one-to-one correspondence with the feed holes 21. The number of through rods 4 is less than the number of feed holes 21 on one end flange 2, that is, some feed holes 21 are provided with through rods 4, while some feed holes 21 are not provided with through rods 4. The sealing structure assembly 3 without through rods 4 inside also includes a plug 34. If it is necessary to add through rods 4, the plug 34 can be removed from the sealing structure assembly 3 and replaced with through rods 4.

[0058] Specifically, the plug 34 may include a columnar main body 341 and a limiting part 342 fixedly connected to one end of the main body 341, with the edge of the limiting part 342 protruding from the side edge of the main body 341. When the plug 34 is installed on the feed hole 21, its main body 341 passes through the first through hole 313, the second through hole 321, and the third through hole 331, while the plug 34 is located outside the sealing thread 31, facilitating the insertion and removal of the plug 34 by the operator. The diameter of its main body 341 is adapted to the diameter of the third through hole 331, and the diameter of the main body 341 may be the same as the diameter of the outer sheath 41 of the penetrating mandrel 4. The contact relationship between its main body 341 and the sealing structure assembly 3, as well as the force transmission process, can be referred to the relationship between the penetrating mandrel 4 and the sealing structure assembly 3 in the above embodiments, and will not be repeated here.

[0059] In some embodiments, the first through hole 313 further includes a first main body segment 3132 connected to the second inclined segment 3131, and the second through hole 321 further includes a second main body segment 3212 connected to the fourth inclined segment 3211. The diameter of the first main body segment 3132 is greater than the diameter of the second main body segment 3212, which is greater than the diameter of the third through hole 331.

[0060] In this embodiment, the diameter of the first main body segment 3132 can be 26.5 mm, the diameter of the second main body segment 3212 can be 26 mm, the diameter of the third through hole 331 can be 25.5 mm, and the diameter of the through core rod 4 or the diameter of the plug 34 main body 341 can be 25.4 mm. That is, the diameters of the first main body section 3132, the second main body section 3212, and the third through hole 331 are all slightly larger than the diameter of the through mandrel 4 or the main body 341 of the plug 34, so that the sealing structure assembly 3 can move relative to the main body 341 of the through mandrel 4 or the plug 34 during installation or disassembly. Since the sealing area between the sealing structure assembly 3 and the main body 341 of the through mandrel 4 or the plug 34 is mainly in the compression sealing ring 33 part, only the inner wall of the third through hole 331 can directly contact the side wall of the main body 341 of the through mandrel 4 or the plug 34. Therefore, the diameters of the first through hole 313 of the sealing thread 31 and the second through hole 321 of the guide pressure ring 32 can be larger than the diameter of the third through hole 331 of the compression sealing ring 33 to reduce processing costs.

[0061] In some embodiments, the hardness of the sealing thread 31 and the guide pressure ring 32 is greater than the hardness of the extrusion sealing ring 33.

[0062] In this embodiment, since the sealing threaded component 31 needs to directly contact the torque wrench and the internal thread section 211 of the feed hole 21, it experiences the greatest pressure. To prevent damage during installation or disassembly, which would affect the sealing performance of the through-hole, it has a high hardness requirement, and the material can be 304 stainless steel. The guide pressure ring 32 can also be made of 304 stainless steel. The compression sealing ring 33, on the other hand, needs to deform inwards so that the inner wall of its third through-hole 331 directly contacts the through-hole mandrel 4 or the main body 341 of the plug 34. Therefore, the hardness requirement of the compression sealing ring 33 is relatively low, meaning its plasticity requirement is higher, and its material can be copper.

[0063] In some embodiments, the axes of the sealing thread 31, the guide pressure ring 32, and the compression sealing ring 33 are on the same straight line.

[0064] Specifically, the axes of the feed hole 21, internal thread section 211, force application section 311, external thread section 312, first through hole 313, second through hole 321, third through hole 331, first inclined section 212, second inclined section 3131, third inclined section 322, fourth inclined section 3211, fifth inclined section 323, sixth inclined section 332, seventh inclined section 333, and the through mandrel 4 (or the main body 341 of the plug 34) are all on the same straight line to ensure that the force can be transmitted evenly. The outer diameter of the force application section 311 can be 38mm, the outer diameter of the external thread section 312 can be 34mm, and the surface thread specification of the external thread section 312 can be M40×1.5. The maximum outer diameter of the guide pressure ring 32 can be 34mm. The maximum outer diameter of the compression sealing ring 33 can be 30mm.

[0065] Based on the above embodiments, the installation process of the sealing structure assembly will be briefly described in general:

[0066] 1. For the feed hole for installing the through mandrel, first pass the through mandrel through the feed hole on the end flange at one end of the sleeve and push it forward until the through mandrel emerges from the feed hole on the end flange at the other end of the sleeve. Then, sequentially mount the compression sealing ring, guide ring, and sealing threaded component onto the through mandrel, ensuring the mounting direction matches the positional relationship described in the above embodiments. Push the compression sealing ring, guide ring, and sealing threaded component along the through mandrel to the feed hole. Apply a torque of 400 N·m to the force-applying section of the sealing threaded component using a torque wrench, gradually engaging the external thread section of the sealing threaded component with the internal thread section of the feed hole. This pushes the sealing threaded component, compression sealing ring, and guide ring, ensuring the sealing structure assembly is tightly installed in the feed hole.

[0067] 2. For the feedthrough hole where the plug is installed, the sealing threaded component, guide pressure ring, and extrusion sealing ring can be sequentially fitted onto the main body of the plug from the end of the main body that is not connected to the limiting part. The sealing threaded component, guide pressure ring, and extrusion sealing ring are then pushed to contact with adjacent components. The entire assembly consisting of the sealing threaded component, guide pressure ring, extrusion sealing ring, and plug is then inserted into the feedthrough hole. A torque of 400 N·m is applied to the force-applying section of the sealing threaded component using a torque wrench, so that the external thread section of the sealing threaded component gradually engages with the internal thread section of the feedthrough hole, thereby pushing the sealing threaded component, extrusion sealing ring, and guide pressure ring to ensure that the sealing structure assembly is tightly installed in the feedthrough hole.

[0068] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A seal structure assembly for installation in a feedthrough hole of an end flange of a through-going member, characterized by, The feedthrough hole comprises, from outside to inside, an internally threaded section and a first inclined section, the diameter of the first inclined section gradually decreases from outside to inside; the sealing structure assembly comprises, from outside to inside, a sealing threaded part, a guide compression ring and an extrusion sealing ring which are tightly fitted, and the inside of the sealing structure assembly is used for arranging the through core rod; The sealing threaded part is internally provided with a first through hole, the sealing threaded part comprises a force applying section away from the end flange and an externally threaded section close to the end flange, the externally threaded section is used for cooperating with the internally threaded section, and the first through hole comprises a second inclined section close to one end of the guide compression ring, the diameter of the second inclined section gradually increases from inside to outside; The guide compression ring is internally provided with a second through hole, one end of the guide compression ring close to the sealing threaded part comprises a third inclined section, the third inclined section is tightly contacted with the second inclined section, and one end of the second through hole close to the extrusion sealing ring comprises a fourth inclined section, the diameter of the fourth inclined section gradually increases from inside to outside; The extrusion sealing ring is internally provided with a third through hole matched with the diameter of the through core rod, one end of the extrusion sealing ring close to the guide compression ring comprises a sixth inclined section, the sixth inclined section is tightly contacted with the fourth inclined section, and one end of the extrusion sealing ring away from the guide compression ring comprises a seventh inclined section which is tightly contacted with the first inclined section.

2. The sealed structural assembly of claim 1, wherein, One end of the guide compression ring close to the extrusion sealing ring comprises a fifth inclined section, the diameter of the fifth inclined section gradually decreases from the direction away from the extrusion sealing ring to the direction close to the extrusion sealing ring, and the fifth inclined section is tightly contacted with the first inclined section; wherein the first inclined section comprises a first sub-section and a second sub-section, the distance between the second sub-section and the internally threaded section is less than the distance between the first sub-section and the internally threaded section, the first sub-section is tightly contacted with the seventh inclined section, and the second sub-section is tightly contacted with the fifth inclined section.

3. The sealed structural assembly of claim 1, wherein, The surfaces of the third inclined section and the fourth inclined section of the guide compression ring are provided with a butter layer.

4. The sealed structural assembly of claim 1, wherein, The surface of the sixth inclined section of the extrusion sealing ring is provided with a high vacuum silicon grease layer.

5. The sealed structural assembly of claim 1, wherein, The surface of the externally threaded section of the sealing threaded part is provided with an anti-bite agent layer.

6. The sealed structural assembly of claim 1, wherein, The first through hole further comprises a first main section connected with the second inclined section, the second through hole further comprises a second main section connected with the fourth inclined section, and the diameter of the first main section is greater than the diameter of the second main section and the diameter of the third through hole.

7. The sealed structural assembly of claim 1, wherein, The hardness of the sealing threaded part and the guide compression ring is greater than the hardness of the extrusion sealing ring.

8. The sealed structural assembly of claim 1, wherein, The axes of the sealing threaded part, the guide compression ring and the extrusion sealing ring are on the same straight line.

9. The sealed structural assembly of claim 1, wherein, The end flange is provided with a plurality of feedthrough holes, the sealing structure assembly is arranged one by one with the feedthrough holes, the sealing structure assembly which is not arranged with the through core rod further comprises a plug, the plug is simultaneously arranged in the first through hole, the second through hole and the third through hole, and the diameter of the plug is matched with the diameter of the third through hole.

10. A through member comprising a sleeve and an end flange fixedly connected to an end of the sleeve, the end flange having a plurality of feedthrough holes formed therein, characterized by, The through-penetration further comprises a plurality of the sealing structure assemblies according to any one of claims 1 to 9, which are respectively installed in the plurality of feed-through holes of the end flanges.

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