A high temperature gas cooled reactor hot gas duct annulus isolation device

Abstract

This application discloses an annular cavity isolation device for hot gas ducts in a high-temperature gas-cooled reactor, relating to the field of nuclear reactor equipment technology. It includes a pipe assembly, a movable seal, a sealing mating component, and a drive assembly. The pipe assembly includes an inner pipe and an outer pipe sleeved outside the inner pipe, forming an annular flow channel between them. The movable seal is disposed within the annular flow channel. The sealing mating component is disposed on the outer wall of the inner pipe and is configured to cooperate with the movable seal in a closed state to form a sealing surface. The drive assembly includes a drive component and a transmission component. The drive component is connected to the movable seal through the transmission component, which is configured to convert the rotational motion of the drive component into the linear motion of the movable seal, thereby driving the movable seal to move in a direction away from or towards the sealing mating component. This application can ensure reliable isolation and on / off control of the fluid within the annular cavity while also achieving a compact structure and convenient operation and maintenance.

Description

Technical Field

[0001] This application relates to the field of nuclear reactor equipment technology, and more specifically, to an annular cavity isolation device for hot gas ducts in a high-temperature gas-cooled reactor. Background Technology

[0002] As a fourth-generation advanced nuclear energy system, the high-temperature gas-cooled reactor (HTGR) possesses inherent safety and high operating temperature characteristics. Its main loop hot gas ducts employ a coaxial structure with a cold-wrapped hot gas core. The inner duct delivers approximately 750°C high-temperature helium gas to the steam generator, while the outer duct forms a return channel with the inner duct, delivering approximately 250°C low-temperature helium gas back to the reactor core, thus forming a closed-loop helium coolant circulation. To meet the requirements of system operation safety and equipment maintenance, isolation devices are often installed at specific locations along the pipelines to cut off fluid flow within the annular channel.

[0003] In existing hot gas duct isolation schemes for the main loop of high-temperature gas-cooled reactors, a multi-valve parallel structure or a wedge-shaped vortex structure is typically used. However, these complex valve structures often result in a large overall device size, making it difficult to fit into the compact installation space of the hot gas ducts in high-temperature gas-cooled reactors. Furthermore, the fluid experiences significant flow resistance when flowing through the device, easily leading to system pressure loss. In addition, the complex mechanical linkage structure makes daily maintenance difficult, making it challenging to balance the economic efficiency and stability of the equipment operation.

[0004] Therefore, how to ensure reliable isolation and on / off control of the fluid within the annular cavity while simultaneously maintaining structural compactness and ease of operation and maintenance has become a pressing technical problem in this field. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide an annular cavity isolation device for hot gas ducts of high-temperature gas-cooled reactors, so as to ensure reliable isolation and on / off control of fluids in the annular cavity while taking into account structural compactness and ease of operation and maintenance.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A high-temperature gas-cooled reactor hot gas duct annular cavity isolation device, comprising:

[0008] A pipe assembly, the pipe assembly including an inner pipe and an outer pipe sleeved outside the inner pipe, wherein an annular flow channel is formed between the inner pipe and the outer pipe;

[0009] A movable seal is disposed within the annular flow channel and configured to switch between an open state and a closed state.

[0010] A sealing element is disposed on the outer wall of the inner tube, and the sealing element is configured to cooperate with the movable seal in the closed state to form a sealing surface;

[0011] A drive assembly, comprising a drive member and a transmission assembly, wherein the drive member is connected to the movable seal via the transmission assembly, and the transmission assembly is configured to convert the rotational motion of the drive member into linear motion of the movable seal, thereby driving the movable seal to move in a direction away from or towards the sealing mating member.

[0012] Optionally, in the above-mentioned high-temperature gas-cooled reactor hot gas duct annular cavity isolation device, the sealing fitting is a sealing boss, and the sealing boss is spindle-shaped at the axial flow-facing surface along the annular flow channel.

[0013] Optionally, in the above-mentioned high-temperature gas-cooled reactor hot gas duct annular cavity isolation device, the number of the sealing mating parts is two, and the two sealing mating parts are respectively disposed on opposite sides of the outer wall of the inner tube along the first direction, and the outer extension shape of the two sealing mating parts matches the inner extension shape of the movable seal.

[0014] Optionally, in the above-mentioned high-temperature gas-cooled reactor hot gas duct annular cavity isolation device, the movable seal includes two sealing plates symmetrically arranged along a second direction, the second direction being perpendicular to the first direction, and each sealing plate is correspondingly provided with at least one set of the driving components, so that the two sealing plates can move in opposite or opposite directions in a straight line under the drive of the driving components.

[0015] Optionally, in the above-mentioned high-temperature gas-cooled reactor hot gas duct annular cavity isolation device, the transmission component includes a rotary transmission component and a linear transmission component. The rotary transmission component is connected to the driving component, and the linear transmission component is connected to the movable seal. The linear transmission component is also connected to the rotary transmission component.

[0016] Optionally, in the above-mentioned high-temperature gas-cooled reactor hot gas duct annular cavity isolation device, the rotary transmission component is a drive gear, and the linear transmission component is a guide rack that meshes with the drive gear.

[0017] Optionally, in the above-mentioned high-temperature gas-cooled reactor hot gas duct annular cavity isolation device, the driving component is a servo motor with an electromagnetic brake, and the driving component enters a locked state when the movable seal reaches a preset open or closed position.

[0018] Optionally, the above-mentioned high-temperature gas-cooled reactor hot gas duct annular cavity isolation device further includes a reinforcing member, which is arranged circumferentially along the outer wall of the inner tube, and the reinforcing member is used to enhance the structural strength of the sealing surface.

[0019] Optionally, the above-mentioned high-temperature gas-cooled reactor hot gas duct annular cavity isolation device further includes a protective shell, which is fixedly disposed on the outside of the outer tube, and the movable seal and the transmission assembly are both disposed inside the protective shell.

[0020] The annular cavity isolation device for the hot gas duct of a high-temperature gas-cooled reactor provided in this application forms an annular flow channel through the inner and outer pipes of the pipe assembly, and a movable seal is installed within this annular flow channel. A sealing mating component is also configured on the outer wall of the inner pipe. Based on this, a drive assembly including a drive component and a transmission assembly converts the rotational motion of the drive component into the linear motion of the movable seal, thereby driving the movable seal to move closer to or away from the sealing mating component to achieve channel opening and closing control. As can be seen from the above example, the annular cavity isolation device for the hot gas duct of a high-temperature gas-cooled reactor provided in this application, through motion conversion via the transmission assembly, allows the drive component to be arranged along the axial direction of the pipe. Combined with the optimized design of the sealing mating component, this significantly reduces the overall radial space occupied by the annular cavity isolation device for the hot gas duct of the high-temperature gas-cooled reactor, effectively adapting to the compact layout of the hot gas duct of the high-temperature gas-cooled reactor. Simultaneously, the simplified structure based on rotary-linear transmission avoids the complex flow channels caused by traditional multi-valve structures, reduces the flow resistance and pressure loss of the fluid in the annular channel, and improves the system's flow efficiency. In addition, the movable seal directly engages with the sealing mating parts through linear motion to form a sealing surface, which simplifies the overall structure, reduces the difficulty of daily maintenance, and improves the economic efficiency of equipment operation.

[0021] The technical features mentioned above, those to be mentioned below, and those shown individually in the accompanying drawings can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are those explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a cross-sectional view of the overall structure of the annular cavity isolation device for the hot gas duct of the high-temperature gas-cooled reactor provided in the embodiments of this application;

[0024] Figure 2 A partial structural diagram of the closed state of the active seal provided in an embodiment of this application;

[0025] Figure 3 A partial structural cross-sectional view of the closed state of the active seal provided in this application embodiment in the flow channel direction;

[0026] Figure 4 This is a schematic diagram of the inner tube provided in an embodiment of this application;

[0027] The annotations in the attached figures are explained as follows:

[0028] Among them, 10 is the pipe assembly, 11 is the inner pipe, 12 is the outer pipe, 13 is the annular flow channel, 20 is the movable seal, 21 is the sealing plate, 30 is the sealing mating part, 40 is the drive assembly, 41 is the drive component, 42 is the transmission assembly, 421 is the rotary transmission component, 422 is the linear transmission component, 50 is the reinforcing component, and 60 is the protective shell. Detailed Implementation

[0029] The core of this application is to provide an annular cavity isolation device for hot gas ducts of high-temperature gas-cooled reactors, which can ensure reliable isolation and on / off control of fluids in the annular cavity while taking into account structural compactness and ease of operation and maintenance.

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] In the field of nuclear reactor equipment, particularly high-temperature gas-cooled reactor (HTGR) equipment, the hot gas duct of an HTGR is a special structural form. The hot gas duct in the main loop of an HTGR typically adopts a coaxial structure with a cold-wrapped heat exchanger. The inner tube transports high-temperature helium to the steam generator, while the annular gap between the outer and inner tubes serves as a return channel for low-temperature helium, thus forming a closed loop of helium coolant. To ensure the safety of nuclear reactor operation, when the steam generator heat transfer tube ruptures or the main loop equipment requires maintenance, it is necessary to quickly and reliably cut off the fluid flow within the annular channel to prevent secondary loop moisture from entering the reactor core through the hot gas duct. However, existing isolation schemes, such as multi-valve parallel structures or wedge-shaped spiral structures, are complex in design, resulting in a large overall size that is difficult to fit into the compact installation space of the HTGR hot gas duct. Furthermore, the fluid experiences significant flow resistance when flowing through these complex structures, easily leading to system pressure loss.

[0032] Therefore, such as Figure 1As shown in the figure, this application discloses an annular cavity isolation device for a hot gas duct of a high-temperature gas-cooled reactor, including a pipe assembly 10, a movable seal 20, a sealing mating part 30, and a drive assembly 40. Motion conversion is achieved through the transmission assembly 42, allowing the drive part 41 to be arranged along the pipe axial direction. Combined with the structural design of the sealing mating part 30, this significantly reduces the overall radial space occupied by the annular cavity isolation device for the hot gas duct of the high-temperature gas-cooled reactor, effectively adapting to the compact layout of the hot gas duct of the high-temperature gas-cooled reactor. Simultaneously, the simplified structure based on rotary-linear drive avoids the complex flow channels caused by traditional multi-valve structures, reducing the flow resistance and pressure loss of fluid in the annular channel and improving the system's flow efficiency. Furthermore, the movable seal 20 directly engages with the sealing mating part 30 through linear motion to form a sealing surface, simplifying the overall structure, reducing the difficulty of daily maintenance, and improving the economic efficiency of equipment operation.

[0033] The following will combine Figures 1 to 4 The annular cavity isolation device for hot gas ducts of high-temperature gas-cooled reactors disclosed in the embodiments of this application will be explained and described in detail.

[0034] like Figure 1 and Figure 3 As shown, the piping assembly 10 serves as the basic carrier of the annular cavity isolation device for the hot gas duct of a high-temperature gas-cooled reactor. It may include an inner tube 11 and an outer tube 12 sleeved outside the inner tube 11, with an annular flow channel 13 formed between the inner tube 11 and the outer tube 12. In specific applications, the inner tube 11 can serve as the transport channel for the main loop hot fluid, while the annular flow channel 13 can serve as the return channel for the cold fluid, forming a coaxial flow channel structure. The cross-section of the annular flow channel 13 may be annular, and its radial thickness is the distance between the outer wall of the inner tube 11 and the inner wall of the outer tube 12. By adopting a coaxial arrangement, the piping assembly 10 has good radial symmetry and compactness, which is beneficial for arranging the isolation device within a limited space.

[0035] like Figure 1 and Figure 3 As shown, the movable seal 20 can be disposed within the annular flow channel 13, and the movable seal 20 is configured to switch between an open state and a closed state. When the movable seal 20 is in the open state, fluid can pass normally within the annular flow channel 13; when the movable seal 20 is in the closed state, fluid flow within the annular flow channel 13 is cut off.

[0036] In some embodiments, such as Figure 1 and Figure 3As shown, in order to achieve omnidirectional sealing of the annular flow channel 13, the outer contour of the movable seal 20 is adapted to the cross-sectional shape of the annular flow channel 13. The movable seal 20 may include two sealing plates 21 symmetrically arranged along a second direction, and the second direction is perpendicular to the first direction. That is, the two sealing plates 21 are symmetrically distributed in the vertical direction so that when the two sealing plates 21 are spliced ​​together, they can completely cover the cross-section of the annular flow channel 13, achieving complete fluid isolation. At the same time, each sealing plate 21 may be provided with at least two sets of driving components 40, that is, each sealing plate 21 may be provided with two sets of driving components 40, and the two sets of driving components 40 are respectively located at both ends of the sealing plate 21, so as to ensure that the two sealing plates 21 can move in opposite or opposite directions in a straight line under the independent drive of the two sets of driving components 40. Of course, each sealing plate 21 may also be provided with three, four or more sets of driving components 40 to ensure the stability of the linear movement of the sealing plate 21. Specifically, this embodiment does not use a single drive source to simultaneously pull the two sealing plates 21 through complex mechanical linkages (such as connecting rods and gear sets). Instead, each sealing plate 21 is equipped with at least two complete drive assemblies 40, meaning that each sealing plate 21 can be equipped with at least two drive assemblies 40. Each drive assembly 40 independently includes a drive component 41 and a transmission component 42, and the drive assemblies 40 of the two sealing plates 21 are spatially independent of each other and can be arranged symmetrically along the second direction. Since each sealing plate 21 is equipped with at least two independent drive components 40, the two sealing plates 21 can be driven by independent power sources to achieve opposite or backward movement. This significantly enhances the operational controllability of the annular cavity isolation device for the hot gas duct of the high-temperature gas-cooled reactor. Specifically, during the closing process, the drive components 40 of the two sealing plates 21 can move precisely and synchronously, ensuring perfect alignment of the two sealing plates 21 at the center position. This effectively avoids skewness, jamming, or misalignment of the sealing surfaces caused by uneven driving force on one side, thus ensuring the flatness and airtightness of the overlapping sealing surfaces. Simultaneously, the independent power arrangement simplifies the mechanical linkage structure and reduces the difficulty of assembly and subsequent maintenance and replacement. It should be noted that the first direction can be horizontal, and the second direction can be vertical, perpendicular to the first direction.

[0037] like Figure 1 , Figure 3 and Figure 4As shown, the sealing mating member 30 can be disposed on the outer wall of the inner tube 11, and the sealing mating member 30 is configured to cooperate with the movable seal member 20 in the closed state to form a sealing surface. Specifically, the sealing mating member 30 can adopt a sealing boss structure, and the sealing mating member 30 is fixedly disposed on the outer wall of the inner tube 11. When the movable seal member 20 is driven by the driving assembly 40 to move towards the inner tube 11, the inner edge of the movable seal member 20 will closely fit with the outer surface of the sealing mating member 30. The two work together to form an effective contact sealing surface. Through the structural design of the sealing mating member 30, the radial space occupied by the annular cavity isolation device of the hot gas duct of the high-temperature gas-cooled reactor is effectively reduced.

[0038] In some embodiments, such as Figure 1 , Figure 3 and Figure 4 As shown, two sealing mating parts 30 can be used, and the two sealing mating parts 30 are respectively disposed on opposite sides of the outer wall of the inner tube 11 along the first direction. That is, the two sealing mating parts 30 can be symmetrically disposed on both sides of the outer wall of the inner tube 11 in the horizontal direction. At the same time, the outer extension shape of the two sealing mating parts 30 matches the inner extension shape of the movable seal 20. By providing sealing mating parts 30 on opposite sides, when the movable seal 20 is closed, the sealing plates 21 on both sides can simultaneously engage with the corresponding sealing mating parts 30, thereby forming a complete annular sealing ring in the annular flow channel 13.

[0039] In some embodiments, such as Figure 1 , Figure 3 and Figure 4 As shown, the sealing mating component 30 is spindle-shaped on the axial flow-facing surface along the annular flow channel 13. That is, the sealing mating component 30 has a streamlined profile in the fluid flow direction, gradually contracting at the flow-facing end, leveling out in the middle, and smoothly transitioning at the flow-reverse end. When the movable seal 20 is in the open state, the fluid flows along the annular flow channel 13. Due to the spindle-shaped design of the sealing mating component 30, the fluid does not experience severe boundary layer separation when flowing through it, effectively reducing the local flow resistance at the sealing mating component 30 and minimizing system pressure loss. Simultaneously, the spindle-shaped structure helps guide the fluid to flow smoothly, preventing high-speed airflow or water flow from directly impacting the steep walls of the sealing mating component 30, thereby reducing vibration and noise.

[0040] In some embodiments, the sealing mating component 30 and the inner tube 11 can be integrally formed, that is, a boss structure can be directly machined into the outer wall of the inner tube 11, which helps to improve the connection rigidity and sealing reliability between the components. Of course, the sealing mating component 30 can also be installed on the inner tube 11 by welding, so as to adapt to different pipe specifications.

[0041] like Figure 1 and Figure 2 As shown, the drive assembly 40 can drive the movable seal 20 to move, and the drive assembly 40 may include a drive member 41 and a transmission assembly 42. The drive member 41 is connected to the movable seal 20 via the transmission assembly 42, and the transmission assembly 42 is configured to convert the rotational motion of the drive member 41 into linear motion of the movable seal 20, thereby driving the movable seal 20 to move in a direction away from or towards the sealing mating member 30. The rotary-linear conversion mechanism allows the drive member 41 to be arranged radially outward of the pipe, making the installation, wiring, and maintenance of the drive member 41 more convenient.

[0042] In some embodiments, such as Figures 1 to 3 As shown, the transmission assembly 42 may include a rotary transmission component 421 and a linear transmission component 422. The rotary transmission component 421 is connected to the output end of the drive component 41, and the linear transmission component 422 is fixedly connected to the movable seal 20, and is also connected to the rotary transmission component 421. Specifically, the rotary transmission component 421 may be a drive gear, and the linear transmission component 422 may be a guide rack that meshes with the drive gear. The drive gear and the guide rack mesh through continuous tooth patterns, which not only enables precise linear displacement control but also provides a certain degree of self-locking capability. When the drive gear stops rotating, the guide rack will not easily slip without external force.

[0043] In some embodiments, such as Figure 2 As shown, the drive unit 41 can be a servo motor with an electromagnetic brake. During transmission, the servo motor outputs torque to drive the drive gear to rotate, which in turn drives the guide rack meshing with it to move. The guide rack then drives the sealing plate 21 to perform linear reciprocating motion within the annular flow channel 13. When the movable seal 20 moves to a preset open position or a preset closed position, the electromagnetic brake can enter a locked state. Due to the locking of the drive gear, the positions of the guide rack and the movable seal 20 are also locked. By locking the electromagnetic brake, it can be ensured that the movable seal 20 always maintains a tight fit with the sealing mating part 30 in the closed state, unaffected by fluid pressure fluctuations; in the open state, it also avoids unnecessary drift of the movable seal 20, ensuring the safety and reliability of the annular cavity isolation device for the hot gas duct of the high-temperature gas-cooled reactor.

[0044] In some embodiments, the drive unit 41 can also be a servo motor with a reduction gear, which not only increases the output torque and overcomes the resistance of fluid pressure when the movable seal 20 closes, but also further improves the accuracy of the rotary-linear motion conversion through the reduction action of the reduction gear, making the movement of the movable seal 20 smoother. In addition, the meshing surfaces of the drive gear and the guide rack can be hardened or coated with a wear-resistant coating to reduce wear during long-term reciprocating motion and further extend the service life of the device.

[0045] In some embodiments, such as Figure 1 and Figure 3 As shown, to further improve the sealing effect and structural strength when the annular flow channel 13 is closed, the high-temperature gas-cooled reactor hot gas duct annular cavity isolation device may also include a reinforcing member 50, which is arranged circumferentially along the outer wall of the inner tube 11. The reinforcing member 50 may be an annular metal hoop or structural rib surrounding the outer wall of the inner tube 11. When the movable sealing member 20 and the sealing mating member 30 are tightly fitted, a radial compressive force is generated on the inner tube 11. The reinforcing member 50 can enhance the deformation resistance of the inner tube 11 at this location, preventing local depressions or expansions, thereby ensuring the cylindricity of the sealing mating member 30 and the flatness of the sealing surface. Simultaneously, the reinforcing member 50 can also serve as a mounting base or reinforcing support for the sealing mating member 30, further stabilizing its position. By setting the reinforcing member 50, the structural reliability of the device under high temperature and high pressure environments can be effectively improved, extending the service life of the high-temperature gas-cooled reactor hot gas duct annular cavity isolation device.

[0046] In some embodiments, such as Figures 1 to 3 As shown, the annular cavity isolation device for the hot gas duct of the high-temperature gas-cooled reactor may further include a protective shell 60, which is fixedly disposed on the outside of the outer tube 12. The movable seal 20 and the transmission assembly 42 are both disposed inside the protective shell 60. The protective shell 60 provides physical isolation protection, and the protective shell 60 and the outer tube 12 can be fixed together by welding to ensure the overall structural airtightness.

[0047] To further enable those skilled in the art to clearly understand the working process of the annular cavity isolation device for the hot gas duct of the high-temperature gas-cooled reactor provided in this application, the working principle of the device will be described in detail below in conjunction with typical operating conditions.

[0048] like Figure 1 and Figure 2As shown, when the high-temperature gas-cooled reactor is in normal operating condition, the helium in the main loop continuously circulates between the steam generator and the reactor core. At this time, the annular flow channel 13 needs to remain unobstructed to ensure that the cryogenic helium can smoothly return to the reactor core. In this state, the operator or control system issues an open command to the drive unit 41 (servo motor). After receiving the command, the drive unit 41 begins to rotate forward, driving the rotary transmission component 421 (drive gear) to rotate. The drive gear, through tooth meshing, drives the linear transmission component 422 (guide rack) along the second direction (…). Figure 1 The guide rack moves the two sealing plates 21 outward in a straight line (vertical direction). Simultaneously, it drives the two sealing plates 21 to move away from each other, causing the movable sealing element 20 to exit the cross-sectional area of ​​the annular flow channel 13 and switch to the open state. When the two sealing plates 21 move to the preset open limit position, the drive element 41 automatically enters the locking state, locking the position of the sealing plates 21. At this time, the annular flow channel 13 is restored to unobstructed flow, and helium flows smoothly along the space between the outer wall of the inner tube 11 and the sealing mating element 30. Because the flow-facing surface of the sealing mating element 30 is spindle-shaped, the flow resistance of helium when flowing through the area of ​​the sealing mating element 30 is extremely small, and the overall pressure drop of the system remains within the ideal range, ensuring the efficient operation of the reactor main loop.

[0049] like Figure 3 As shown, when maintenance is required on reactor-related equipment such as the steam generator and main helium blower, or in the event of an accident such as a secondary loop water vapor leak, the fluid flow within the annular flow channel 13 must be quickly cut off to prevent water vapor from entering the reactor core. At this time, the control system sends a closing command to the drive unit 41. The drive unit 41 begins to rotate in the opposite direction, causing the drive gear to reverse. The drive gear drives the two sealing plates 21 to move towards each other (i.e., move closer to each other) via a guide rack. At the end of the linear motion, the inner edge of the sealing plate 21 contacts and is squeezed against the sealing mating parts 30 on both sides of the outer wall of the inner tube 11. As the drive unit 41 continues to output pressure, the contact pressure between the sealing plate 21 and the sealing mating parts 30 continuously increases, eventually forming a tightly fitting sealing surface that completely blocks the cross-sectional channel of the annular flow channel 13. When the movable sealing part 20 reaches the preset closed position (i.e., the position where an effective sealing surface is formed), the drive unit 41 re-enters the locking state, locking the position of the sealing plate 21. At this point, the fluid in the annular flow channel 13 is completely cut off, isolating the reactor core from potential external contamination sources and providing safe and reliable isolation conditions for equipment maintenance.

[0050] The terminology used in the above embodiments is for the purpose of describing specific embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions "a," "an," "the," "the," "the," and "this" are intended to also include expressions such as "one or more," unless the context clearly indicates otherwise. It should also be understood that in the embodiments of this application, "one or more" refers to one, two, or more; "and / or" describes the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0051] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0052] The "multiple" mentioned in the embodiments of this application refers to two or more. It should be noted that in the description of the embodiments of this application, terms such as "first" and "second" are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0053] The terms "parallel" and "perpendicular" used in this application refer to "basically parallel" and "basically perpendicular" in practical operation. "Basically parallel" can be understood as parallelism with a certain degree of error, and similarly, "basically perpendicular" can be understood as perpendicularity with a certain degree of error.

[0054] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high temperature gas cooled reactor hot gas duct annulus isolation device, characterized by, include: Pipe assembly (10), the pipe assembly (10) includes an inner pipe (11) and an outer pipe (12) sleeved outside the inner pipe (11), and an annular flow channel (13) is formed between the inner pipe (11) and the outer pipe (12). A movable seal (20) is disposed within the annular flow channel (13) and is configured to switch between an open state and a closed state. A sealing fitting (30) is disposed on the outer wall of the inner tube (11), and the sealing fitting (30) is configured to cooperate with the movable seal (20) in the closed state to form a sealing surface; A drive assembly (40) includes a drive member (41) and a transmission assembly (42). The drive member (41) is connected to the movable seal (20) via the transmission assembly (42). The transmission assembly (42) is configured to convert the rotational motion of the drive member (41) into the linear motion of the movable seal (20) to drive the movable seal (20) to move in a direction away from or towards the sealing mating member (30).

2. The HTGR hot gas duct annulus isolation device of claim 1, wherein, The sealing fitting (30) is a sealing boss, which is spindle-shaped at the axial flow-facing surface along the annular flow channel (13).

3. The HTGR hot gas duct annulus isolation device of claim 1 or 2, wherein, The number of the sealing fittings (30) is two, and the two sealing fittings (30) are respectively disposed on opposite sides of the outer wall of the inner tube (11) along the first direction. The outer extension shape of the two sealing fittings (30) matches the inner extension shape of the movable seal (20).

4. The HTGR hot gas duct annulus isolation device of claim 3, wherein, The movable seal (20) includes two sealing plates (21) symmetrically arranged along a second direction, which is perpendicular to the first direction. Each sealing plate (21) is provided with at least one set of the driving components (40) so that the two sealing plates (21) can move in opposite or opposite directions under the drive of the driving components (40).

5. The HTGR hot gas duct annulus isolation device of claim 1, wherein, The transmission assembly (42) includes a rotary transmission component (421) and a linear transmission component (422). The rotary transmission component (421) is connected to the drive component (41), and the linear transmission component (422) is connected to the movable seal (20). The linear transmission component (422) is also connected to the rotary transmission component (421).

6. The HTGR hot gas duct annulus isolation device of claim 5, wherein, The rotary transmission component (421) is a drive gear, and the linear transmission component (422) is a guide rack that meshes with the drive gear.

7. The HTGR hot gas duct annulus isolation device of claim 1, wherein, The drive unit (41) is a servo motor with an electromagnetic brake. The drive unit (41) enters a locked state when the movable seal (20) reaches a preset open or closed position.

8. The HTGR hot gas duct annulus isolation device of claim 1, wherein, It also includes a reinforcing member (50) which is arranged circumferentially along the outer wall of the inner tube (11) and is used to enhance the structural strength of the sealing surface.

9. The annular cavity isolation device for the hot gas duct of a high-temperature gas-cooled reactor according to claim 1, characterized in that, It also includes a protective housing (60), which is fixedly disposed on the outside of the outer tube (12), and the movable seal (20) and the transmission assembly (42) are both disposed inside the protective housing (60).

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