Bypass discharge valve for a high temperature gas cooled reactor

Abstract

The application relates to a bypass discharge valve for a high-temperature gas cooled reactor, which comprises a valve body assembly, a valve seat assembly, a valve core assembly and an actuator; the valve body assembly has a fluid cavity; the valve seat assembly is located in the fluid cavity and has a communication flow channel which is connected with the input end and the output end of the fluid cavity; the valve core assembly comprises a valve core and a valve rod, one end of the valve rod is connected with the valve core, the other end of the valve rod extends out of the fluid cavity and is connected with the actuator to drive the valve core to seal or open the communication flow channel; the outer circumferential side of the valve rod is sealingly connected with the valve body assembly; the valve further comprises a mounting bracket and a connecting piece, the mounting bracket is fixedly installed on the valve body assembly, and the connecting piece is slidingly installed on the mounting bracket; the actuator has an output shaft, the output shaft is connected with the valve rod through the connecting piece; the connecting piece is axially positionally connected with the output shaft and axially positionally connected with the valve rod, and the output shaft and the valve rod have a preset interval, so that the valve rod and the actuator can be stably and reliably operated.

Description

Technical Field

[0001] This invention relates to the field of fluid control technology, and in particular to a bypass discharge valve for a high-temperature gas-cooled reactor. Background Technology

[0002] Bypass valves are commonly used to address extreme pressure differential conditions and achieve smooth fluid pressure reduction. Examples include main steam systems in power plant turbines, critical systems in nuclear power plants, and key pressure reduction stages in large chemical plants. The accuracy and stability of bypass valve control affect the safety and efficiency of the entire system. Existing bypass valves consist of a valve body, valve seat, valve core, actuator, and labyrinth assembly. The actuator drives the valve core to engage with the valve seat mounted on the valve body, enabling the bypass valve to open or close, or adjust its opening degree. The labyrinth assembly communicates with the valve seat and valve body to progressively dissipate the pressure and energy of the fluid passing through multiple, circuitous flow paths, thus achieving smooth pressure reduction.

[0003] For example, Chinese Patent Publication No. CN113124230A discloses an adjustable labyrinth-type minimum flow control valve, which specifically discloses: a valve body, a valve cover, a valve core, a valve seat, a valve stem, and an actuator. The valve seat and valve core are disposed within the valve body. One end of the valve stem extends into the valve body and connects to the valve core, while the other end extends out of the valve cover and connects to the actuator. The control valve also includes a labyrinth disc assembly, which is fixedly disposed within the valve body and sleeved around the periphery of the valve core. The labyrinth disc assembly includes multiple hollow labyrinth discs and multiple solid labyrinth discs.

[0004] In the above scheme, when fluid flows through the channels of the valve seat, valve core, and labyrinth disc assembly, it experiences violent and frequent fluctuations due to changes in fluid pressure and direction, leading to valve core vibration. Since the valve core is directly connected to the actuator via the valve stem, this vibration is transmitted to the actuator through the stem, accelerating fatigue and loosening of internal actuator components, affecting control accuracy, and potentially causing actuator damage. Furthermore, in this scheme, the actuator is directly connected to the valve stem. When the valve stem and the actuator's (output shaft) axis are not aligned, the force applied to the valve stem by the actuator can easily cause bending stress. Given the relatively long length of the valve stem, this can easily lead to bending deformation, affecting stable operation and the effective sealing of the bypass discharge valve. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a bypass discharge valve for high-temperature gas-cooled reactors.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A bypass discharge valve for a high-temperature gas-cooled reactor includes a valve body assembly, a valve seat assembly, a valve core assembly, and an actuator;

[0008] The valve body assembly has a fluid cavity;

[0009] The valve seat assembly is located within the fluid cavity and has a connecting flow channel that connects the input end and the output end of the fluid cavity;

[0010] The valve core assembly includes a valve core and a valve stem. One end of the valve stem is connected to the valve core, and the other end extends outside the fluid cavity and is connected to the actuator to drive the valve core to seal or open the communicating flow channel. The outer periphery of the valve stem is sealed to the valve body assembly.

[0011] It also includes a mounting bracket and a connector, wherein the mounting bracket is fixedly mounted on the valve body assembly and the connector is slidably mounted on the mounting bracket;

[0012] The actuator has an output shaft, which is connected to the valve stem via a connector.

[0013] The connector is axially limited to the output shaft and axially limited to the valve stem, and there is a preset distance between the output shaft and the valve stem.

[0014] Preferably, the mounting bracket has an installation empty area;

[0015] The connector is located within the mounting space and is capable of sliding within the mounting space;

[0016] The connector is detachably connected to the valve stem.

[0017] Preferably, the mounting bracket includes a plurality of connecting rods;

[0018] Several of the connecting rods are arranged in a circular array around the central axis of the output shaft to form the mounting empty area.

[0019] Preferably, along the direction from the actuator to the valve body assembly, the distance of the connecting rod from the central axis of the output shaft gradually increases at least partially;

[0020] The distance of the connecting rod changes at a point with a circular arc transition surface.

[0021] Preferably, the mounting bracket includes a large end fixedly connected to the valve body assembly, and a small end for mounting the actuator;

[0022] The size of the large end is smaller than the size of the small end, and / or the distance from the connection position of the large end to the valve body assembly to the central axis of the output shaft is greater than the maximum distance from the outer edge of the small end to the central axis of the output shaft.

[0023] Preferably, the connecting rod is provided with a first reinforcing rib plate at one end near the actuator, and the first reinforcing rib plate is slidably connected to the connecting member;

[0024] And / or,

[0025] The connecting rod is provided with a second reinforcing rib at one end near the valve body assembly, and the second reinforcing rib is located on the side of the connecting rod away from the mounting void.

[0026] Preferably, the valve body assembly has an opening communicating between the fluid cavity and an external space;

[0027] The valve seat assembly is detachably installed in the fluid cavity through the opening;

[0028] The bypass discharge valve also includes a sealing valve cover assembly, which is pressed against the opening by the mounting bracket;

[0029] The valve stem passes through the sealing valve cover assembly and is sealed to the valve body assembly through the sealing valve cover assembly.

[0030] Preferably, the sealing valve cover assembly includes a valve cover pull ring, a self-sealing valve cover, and a connecting part;

[0031] The valve cover pull ring is axially pressed by the mounting bracket and radially confined on the valve body assembly;

[0032] The self-sealing valve cover is located radially inside the valve cover pull ring, and one end of the self-sealing valve cover extends to the mounting void area, while the other end is connected to the porous sleeve.

[0033] The connecting part is located within the installation void area and connects the valve cover pull ring and the self-sealing valve cover;

[0034] The end of the porous sleeve away from the self-sealing valve cover abuts against the valve seat assembly and forms the operating cavity of the valve core.

[0035] Preferably, the valve body assembly has a first step and a second step;

[0036] The bypass discharge valve also includes a fixed component and a labyrinth component;

[0037] The fixing component is connected to the valve body assembly and presses the valve seat assembly into the first step in a sealing manner.

[0038] The labyrinthine assembly is sealed and pressed against the second step by the valve seat assembly;

[0039] A metal C-shaped sealing ring is provided between the contact surfaces of the labyrinth assembly and the valve seat assembly;

[0040] An elastic sealing ring is provided between the valve seat assembly and the first step, and the elastic sealing ring is located radially outside the metal C-shaped sealing ring.

[0041] Preferably, the valve body assembly has a threaded hole;

[0042] The valve seat assembly includes a first side facing the labyrinthine assembly and a second side facing the fixing assembly;

[0043] The fixing assembly includes a pressure ring, a first double-waisted self-locking washer, a locking bolt, a locking nut, a second double-waisted self-locking washer, and a third double-waisted self-locking washer;

[0044] The pressure ring is threadedly connected to the threaded hole on the valve body assembly to press the first double-waist self-locking washer onto the second surface;

[0045] The second surface is recessed away from the fixed component to form a groove;

[0046] The locking bolt passes sequentially through the locking nut, the second double-waisted self-locking washer, the pressure ring, and the third double-waisted self-locking washer, and extends into the recess;

[0047] The locking bolt is threadedly connected to the pressure ring, and the locking bolt presses the third double-waist self-locking washer into the groove.

[0048] The locking bolt is also threadedly connected to the locking nut, and the locking nut presses the second double-waisted self-locking washer onto the pressure ring.

[0049] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0050] This invention provides a bypass discharge valve for a high-temperature gas-cooled reactor. The output shaft and valve stem are connected via a connector, which is slidably mounted on a mounting bracket. Specifically, the output shaft drives the connector to slide axially, thereby driving the valve stem to move the valve core. This design ensures that even with a slight deviation in the central axis between the valve stem and the output shaft, the force applied by the output shaft is not directly transmitted to the valve stem, but rather to the connector. The connector absorbs the bending moment caused by the slight deviation in the central axis of the output shaft and valve stem, preventing additional bending stress from being transmitted to the valve stem. This effectively prevents bending deformation of the valve stem and also avoids accelerated wear on the outer periphery of the valve stem seal, thus ensuring the reliability of the valve stem periphery seal. Furthermore, the valve stem and output shaft are connected via a connector with a preset gap, preventing the fluid force on the valve core from being transmitted to the actuator through the valve stem, thereby preventing actuator damage and extending the actuator's service life. Attached Figure Description

[0051] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0052] Figure 1 This is a schematic diagram of one example of the structure of the present invention.

[0053] Figure 2 for Figure 1 An enlarged view of position D1 in the middle.

[0054] Figure 3 for Figure 1 A schematic diagram of the mounting bracket.

[0055] Figure 4 for Figure 3 A cross-sectional diagram.

[0056] Figure 5 for Figure 4 An enlarged view of position D2 in the middle.

[0057] Figure 6 for Figure 4 Enlarged diagram of position D3 in the middle.

[0058] Explanation of reference numerals in the attached figures:

[0059] 1. Valve body assembly; 11. Fluid chamber; 111. Inlet chamber; 112. Outlet chamber; 12. Opening; 13. First step; 14. Second step; 15. Threaded hole; 2. Valve seat assembly; 201. First surface; 202. Second surface; 2021. Slot; 21. Flow channel; 3. Valve core assembly; 31. Valve core; 311. Pilot valve core; 312. Main valve core; 32. Valve stem; 4. Actuator; 41. Output shaft; 5. Mounting bracket; 50. Mounting void; 51. Connecting rod; 511. First rod; 512. Second rod; 513. Arc segment; 52. Large end; 53. Small end; 54. First reinforcing rib; 55. Second reinforcing rib; 6. Connector; 7. Sealing valve cover assembly; 71. Valve cover pull ring; 72. Self-sealing valve cover 73. Connecting part; 731. Crimping ring; 732. Limiting bolt; 74. First sealing part; 741. Four-open ring; 742. Self-sealing pressure ring; 743. Self-sealing ring; 75. Second sealing part; 751. Sealing cavity; 752. Packing pad; 753. Sealing packing; 754. Spacer ring; 755. Packing sleeve; 756. Packing pressure plate; 757. Butterfly spring; 758. Butterfly spring spacer; 759. Fastener; 8. Fixing assembly; 81. Pressure ring; 82. First double-waisted self-locking washer; 83. Locking bolt; 84. Locking nut; 85. Second double-waisted self-locking washer; 86. Third double-waisted self-locking washer; 9. Labyrinth assembly; 101. Metal C-type sealing ring; 102. Elastic sealing ring; 103. Multi-hole sleeve; 104. Running cavity. Detailed Implementation

[0060] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0062] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0063] See Figures 1 to 6 This invention provides a bypass discharge valve for a high-temperature gas-cooled reactor, comprising a valve body assembly 1, a valve seat assembly 2, a valve core assembly 3, and an actuator 4. The valve body assembly 1 is the main body of the valve, and has a fluid cavity 11 inside. The valve seat assembly 2 is located within the fluid cavity 11. The actuator 4 drives the valve core assembly 3 to move, so that the valve core assembly 3 and the valve seat assembly 2 cooperate to control the opening, closing, or opening degree adjustment of the bypass discharge valve.

[0064] Specifically, the fluid chamber 11 is divided into an input chamber 111 and an output chamber 112, and the valve seat assembly 2 is installed between the input chamber 111 and the output chamber 112; the valve seat assembly 2 has a connecting flow channel 21 that connects the input chamber 111 and the output chamber 112 of the fluid chamber 11; the valve core assembly 3 includes a valve core 31 and a valve stem 32, one end of the valve stem 32 is connected to the valve core 31, and the other end extends to the outside of the fluid chamber 11 and is connected to the actuator 4 to drive the valve core 31 to seal or open the connecting flow channel 21; the outer periphery of the valve stem 32 is sealed to the valve body assembly 1 to ensure the sealing of the bypass discharge valve.

[0065] See Figure 1 and Figure 4 For ease of understanding, the upper part of the diagram is considered the "upper" of the bypass discharge valve, and the lower part is considered the "lower" of the diagram. The actuator 4, valve stem 32, valve core 31, and valve seat assembly 2 are arranged from top to bottom. The valve seat assembly 2 is positioned relatively closer to its central axis. Figure 1 and Figure 4 The L1 side shown is designated as the "inner side," positioned relatively further away from the central axis of the valve seat assembly 2. Figure 1 and Figure 4 The L1 side shown is designated as the "outer side".

[0066] It is easy to understand that when the actuator 4 drives the valve core 31 to move down to block the connecting flow channel 21 via the valve stem 32, the input chamber 111, the connecting flow channel 21, and the output chamber 112 are cut off, and the bypass discharge valve is closed. When the actuator 4 drives the valve core 31 to move up to separate the valve seat assembly 2 via the valve stem 32, the connecting flow channel 21 is opened, the input chamber 111, the connecting flow channel 21, and the output chamber 112 are connected, the bypass discharge valve is opened, the fluid enters from the input chamber 111, flows through the connecting flow channel 21, and is discharged from the output chamber 112.

[0067] It is worth noting that the fluids mentioned above can be either gases or liquids, depending on the application environment.

[0068] See Figures 1 to 5 The bypass discharge valve also includes a mounting bracket 5 and a connector 6. The mounting bracket 5 is fixedly mounted on the valve body assembly 1, and the connector 6 is slidably mounted on the mounting bracket 5. The actuator 4 has an output shaft 41, which is connected to the valve stem 32 via the connector 6. The connector 6 is axially limited to the output shaft 41 and also axially limited to the valve stem 32. That is, the output shaft 41 and the valve stem 32 are connected via the connector 6, and the connector 6 is slidably mounted on the mounting bracket 5. In other words, the output shaft 41 drives the connector 6 to slide axially, thereby driving the valve stem 32 to move the valve core 31. This arrangement ensures that even if there is a slight deviation between the central axis of the valve stem 32 and the output shaft 41, the force applied by the output shaft 41 will not be directly transmitted to the valve stem 32, but rather applied to the connector 6. The connector 6 absorbs the bending moment caused by the slight deviation between the central axes of the output shaft 41 and the valve stem 32, preventing additional bending stress from being transmitted to the valve stem 32 and effectively preventing bending deformation of the valve stem 32. At the same time, it can also prevent the valve stem 32 from being subjected to lateral forces, thereby preventing the seal wear on the outer periphery of the valve stem 32 from being aggravated, and thus effectively ensuring the reliability of the seal on the periphery of the valve stem 32.

[0069] Furthermore, there is a preset distance between the output shaft 41 and the valve stem 32. When the valve core 31 is subjected to fluid force, it will not be directly transmitted to the output shaft 41 and other structures of the actuator 4 (such as pneumatic structures, drive gears and other internal drive components) through the valve stem 32. This can prevent damage to the actuator 4 and help extend the service life of the actuator 4.

[0070] See Figures 1 to 3The mounting bracket 5 has a mounting cavity 50, within which the connecting piece 6 is located and can slide. The connecting piece 6 is detachably connected to the valve stem 32; that is, the connection point between the valve stem 32 and the connecting piece 6 is located within the mounting cavity 50, and the connecting piece 6 and the valve stem 32 are detachable, facilitating their assembly and disassembly. When maintenance of the actuator 4 is required, only the valve stem 32 and the connecting piece 6 need to be separated to perform the maintenance and disassembly of the actuator 4, without disassembling the valve stem 32. This effectively reduces the difficulty of maintenance and ensures that the sealing performance of the bypass discharge valve is not affected.

[0071] Furthermore, the valve core 31 can be configured as a pilot-operated balanced valve core (for specific structure and movement, please refer to CN219911988U, which will not be elaborated here), which includes a pilot valve core 311 and a main valve core 312, wherein the pilot valve core 311 and the valve stem 32 are configured as an integral structure.

[0072] It is easy to understand that since the valve stem 32 does not need to be disassembled during the disassembly and maintenance of the actuator 4, the pilot valve core 311 and the valve stem 32 are set as an integral structure in this embodiment. This not only does not affect the disassembly and maintenance of the actuator 4, but also increases the structural strength of the valve stem 32 to a certain extent, and ensures that the valve stem 32 has sufficient axial extension length.

[0073] Furthermore, the connecting piece 6 and the valve stem 32 are connected by threads. It is understood that the connection between them only needs to achieve axial limiting, such as a snap-fit ​​connection or a stepped shaft and stepped groove fit. Similarly, the connecting piece 6 and the output shaft 41 can also achieve axial limiting connection using threaded connections, stepped shaft and stepped groove fits, snap-fit ​​connections, etc.

[0074] Furthermore, the mounting bracket 5 includes several connecting rods 51; the several connecting rods 51 are arranged in a circular array around the central axis of the output shaft 41 to form a mounting empty area 50, that is, the central axis of the output shaft 41, the connector 6 and the valve stem 32 are closer to the central axis of the mounting bracket 5, so that the mounting bracket 5 provides better support for the output shaft 41, the valve stem 32 and the connector 6. Even if the force of the valve stem 32 is indirectly transmitted (i.e., transmitted through the connector 6 and the output shaft 41) to the mounting bracket 5, the mounting bracket 5 can be subjected to more uniform force and avoid deformation.

[0075] Furthermore, along the direction from the actuator 4 to the valve body assembly 1 (i.e., from top to bottom), the distance between the connecting rod 51 and the central axis of the output shaft 41 gradually increases. Specifically, the connecting rod 51 includes a first rod 511 and a second rod 512, which are connected from top to bottom. The first rod 511 is equidistant from the central axis of the output shaft 41, while the distance between the second rod 512 and the central axis of the output shaft 41 gradually increases from top to bottom. This results in a larger diameter at the end of the connecting rod 51 closest to the valve body assembly 1 (i.e., the diameter of the circle formed by the lower end of the second rod 512), which increases its torsional resistance and ensures the structural and support stability of the connecting rod 51 itself.

[0076] Furthermore, the distance change position of the connecting rod 51 is a circular arc transition surface, that is, the first rod 511 and the second rod 512 are connected by a circular arc segment 513, which helps to avoid stress concentration and prevent the connecting rod 51 from breaking.

[0077] See Figures 1 to 4 Since the actuator 4 is fixed to the valve body assembly 1 via the mounting bracket 5, when the actuator 4 operates to control the opening, closing, or opening adjustment of the bypass discharge valve, it generates a certain torque. This torque is transmitted to the valve body assembly 1 through the mounting bracket 5. Simultaneously, it generates a torque on the mounting bracket 5 itself, attempting to "twist" or "overturn," thus affecting the stability of the mounting bracket 5 and the actuator 4. Therefore, in this embodiment, the mounting bracket 5 includes a large end 52 fixedly connected to the valve body assembly 1 and a small end 53 for mounting the actuator 4. The size of the large end 52 is smaller than the size of the small end 53; that is, the size of the end of the mounting bracket 5 connected to the valve body assembly 1 is larger than the size of the end connected to the actuator 4. This configuration allows the force and torque applied by the actuator 4 to the small end 53 to be evenly distributed over a larger area (i.e., the area where the valve body assembly 1 is connected to the large end 52) using the larger end 52. This avoids damage to the mounting bracket 5 itself due to stress concentration. At the same time, the larger end 52 increases the connection area between the large end 52 and the valve body assembly 1, avoiding stress concentration at the connection point and preventing local deformation of the valve body assembly 1.

[0078] Furthermore, the distance from the connection point of the large end 52 to the valve body assembly 1 to the central axis of the output shaft 41 is greater than the maximum distance from the outer edge of the small end 53 to the central axis of the output shaft 41. This results in a longer lever arm for the generated resisting torque, which in turn allows for a stronger anti-overturning capability under the same preload force. This helps to firmly fix the mounting bracket 5 to the valve body assembly 1 and prevent the mounting bracket 5 from loosening or shaking.

[0079] Specifically, both the large end 52 and the small end 53 are set as annular plates. The outer diameter of the large end 52 is larger than the diameter of the small end 53. One end of the connecting rod 51 (the second rod 512) is connected to the large end 52, and the other end (the first rod 511) is connected to the small end 53. The output shaft 41 extends through the circular hole in the middle of the small end 53 toward the valve seat assembly 2.

[0080] Specifically, the large end 52 is connected to the valve body assembly 1 by a fastening structure formed by several pairs of bolts and nuts, and the fasteners formed by several pairs of bolts and nuts are distributed in a circular array around the central axis of the output shaft 41.

[0081] Furthermore, the central axes of the output shaft 41, valve stem 32, valve seat assembly 2, and valve core assembly 3 are aligned to further prevent the generation of lateral forces.

[0082] Furthermore, the central axes of the large end 52 and the small end 53 can also coincide with the output shaft 41 and the valve stem 32 to increase the support effect of the mounting bracket 5.

[0083] See Figure 3 The connecting rod 51 is provided with a first reinforcing rib plate 54 at one end near the actuator 4, and the first reinforcing rib plate 54 is slidably connected to the connecting member 6.

[0084] Specifically, the output shaft 41 of the actuator 4 is rotatably connected to the connecting member 6, which is slidably mounted on the first reinforcing rib plate 54. The power structure of the actuator 4 (such as a drive gear set) drives the output shaft 41 to rotate. The output shaft 41 converts rotation into linear motion (such as a threaded connection), thereby driving the connecting member 6 to slide along the first reinforcing rib plate 54. It is easy to understand that the first reinforcing rib plate 54 can increase the structural strength of the connecting rod 51 and also provide circumferential limiting and guiding for the connecting member 6. Furthermore, the rotatable connection between the connecting member 6 and the output shaft 41 can prevent the output shaft 41 from generating a large force on the connecting member 6 during rotation and transmitting it to the first reinforcing rib plate 54 and the connecting rod 51, thereby further increasing the structural stability of the connecting rod 51.

[0085] Furthermore, a second reinforcing rib 55 is provided at one end of the connecting rod 51 near the valve body assembly 1. The second reinforcing rib 55 is located on the side of the connecting rod 51 away from the mounting void 50 to increase the structural strength of the lower end of the connecting rod 51 (i.e., the second rod 512).

[0086] It is easy to understand that by setting the first reinforcing rib plate 54 and the second reinforcing rib plate 55, the central axis of the connecting rod 51 plate can still be on the middle surface of the plate. Even if there is a strong force between the connecting piece 6 and the first reinforcing rib plate 54, the second reinforcing rib plate 55 can increase the structural strength of the connecting rod 51, ensure the stability of the connecting rod 51, and prevent the connecting rod 51 from bending deformation or even breaking. Furthermore, by setting the first reinforcing rib plate 54 and the second reinforcing rib plate 55, the natural frequency of the entire mounting bracket 5 can be adjusted to prevent the bypass discharge valve from resonating.

[0087] See Figure 1 ,as well as Figure 4 and Figure 5 The valve body assembly 1 has an opening 12 connecting the fluid chamber 11 to the external space; the valve seat assembly 2 is detachably installed in the fluid chamber 11 through the opening 12. The bypass discharge valve also includes a sealing valve cover assembly 7, which is pressed against the opening 12 by the mounting bracket 5; the valve stem 32 passes through the sealing valve cover assembly 7 and is sealed to the valve body assembly 1 through the sealing valve cover assembly 7, which not only facilitates the disassembly and maintenance of the valve seat assembly 2, but also ensures the effective sealing of the valve body assembly 1 and the valve stem 32.

[0088] In addition, the sealing valve cover assembly 7 is pressed against the opening 12 by the mounting bracket 5, which can further ensure the sealing effect of the sealing valve cover assembly 7.

[0089] Furthermore, the sealing valve cover assembly 7 includes a valve cover pull ring 71, a self-sealing valve cover 72, and a connecting portion 73; wherein, the valve cover pull ring 71 is axially pressed by the mounting bracket 5 and radially limited on the valve body assembly 1; the self-sealing valve cover 72 is located radially inside the valve cover pull ring 71, and one end of the self-sealing valve cover 72 extends to the mounting void 50, and the other end is connected to the porous sleeve 103; the connecting portion 73 is located within the mounting void 50 and connects the valve cover pull ring 71 and the self-sealing valve cover 72; the end of the porous sleeve 103 away from the self-sealing valve cover 72 abuts against the valve seat assembly 2 and forms the operating cavity 104 of the valve core 31.

[0090] It is easy to understand that the self-sealing valve cover 72 extends into the mounting void 50. On the one hand, this facilitates the connection of the connecting part 73 within the mounting void 50 between the valve cover pull ring 71 and the self-sealing valve cover 72, which is beneficial for the assembly of the self-sealing valve cover 72. On the other hand, the self-sealing valve cover 72 increases the circumferential limiting area of ​​the valve stem 32, further preventing excessive bending deformation of the valve core 31. Furthermore, since the self-sealing valve cover 72 extends into the mounting void 50, and the valve stem 32 passes through the sealing valve cover assembly 7 and connects to the connecting part 6, the sealing area of ​​the valve stem 32 and the self-sealing valve cover 72 is located within the mounting void 50, facilitating the observation and maintenance of the sealing condition of both.

[0091] In addition, the valve cover pull ring 71 is axially pressed by the mounting bracket 5 and radially limited on the valve body assembly 1. That is, the valve cover pull ring 71, the mounting bracket 5, and the valve body assembly 1 can limit each other radially to ensure the installation stability of the three. At the same time, when the porous sleeve 103 is subjected to fluid impact, its force can be weakened between the self-sealing valve cover 72, the valve cover pull ring 71, and the bracket assembly (specifically the large end 52), avoiding large deformation of the valve stem 32 and further preventing the actuator 4 from being affected.

[0092] Specifically, the connecting part 73 includes a crimping ring 731 and a limiting bolt 732. The crimping ring 731 is threadedly connected to the portion of the self-sealing valve cover 72 that extends into the mounting void 50. The limiting bolt 732 passes through the crimping ring 731 and extends into a groove provided on the self-sealing valve cover 72. The limiting bolt 732 is threadedly connected to the crimping ring 731. The limiting bolt 732 and the self-sealing valve cover 72 can be connected by one or more combinations of threaded connection, snap-fit, and plug-in connection, which can ensure connection stability and facilitate disassembly and assembly.

[0093] Furthermore, the valve cover pull ring 71 and the valve body assembly 1 (i.e., the inner wall surface of the opening 12) are sealed together by the first sealing part 74, and the self-sealing valve cover 72 and the valve body assembly 1 (i.e., the inner wall surface of the opening 12) are sealed together by the second sealing part 75.

[0094] Specifically, the first sealing part 74 includes a four-ring 741, a self-sealing pressure ring 742, and a self-sealing ring 743 arranged from top to bottom. The four-ring 741 is arranged around the outer periphery of the valve cover pull ring 71, while the self-sealing pressure ring 742 and the self-sealing ring 743 are arranged around the outer periphery of the self-sealing valve cover 72. The self-sealing ring 743 and the self-sealing valve cover 72 are sealed by an outwardly inclined abutment surface.

[0095] Specifically, the second sealing part 75 includes a sealing cavity 751, a packing pad 752, a sealing packing 753, a spacer ring 754, a packing sleeve 755, a packing pressure plate 756, a butterfly spring 757, a butterfly spring spacer 758, and a fastener 759. The packing pad 752, the sealing packing 753, the spacer ring 754, the packing sleeve 755, and the packing pressure plate 756 are sleeved on the valve stem 32, and the packing pressure plate 756 is connected to the self-sealing valve cover 72 through the fastener 759 to press the packing pad 752, the sealing packing 753, the spacer ring 754, and the packing sleeve 755 into the sealing cavity 751. In the sealing cavity 751, the packing sleeve 755, the sealing packing 753, the spacer ring 754, the sealing packing 753, and the packing pad 752 are stacked sequentially from top to bottom, wherein the sealing packing 753 can be provided in multiple layers. Fastener 759 is configured as a bolt and nut structure, and butterfly spring 757 and butterfly spring spacer 758 are pressed between nut and packing pressure plate 756.

[0096] See Figure 4 and Figure 6 The valve body assembly 1 has a first step 13 and a second step 14; the bypass discharge valve also includes a fixed assembly 8 and a labyrinth assembly 9; the fixed assembly 8 is connected to the valve body assembly 1 and seals the valve seat assembly 2 against the first step 13; the labyrinth assembly 9 is sealed against the second step 14 by the valve seat assembly 2; a metal C-type sealing ring 101 is provided between the abutting surfaces of the labyrinth assembly 9 and the valve seat assembly 2; an elastic sealing ring 102 is provided between the valve seat assembly 2 and the first step 13, and the elastic sealing ring 102 is located radially outside the metal C-type sealing ring 101.

[0097] It is easy to understand that the metal C-type sealing ring 101 is designed as an annular structure with a "C"-shaped cross-section. Its two ends abut against the labyrinth assembly 9 and the valve seat assembly 2, respectively, to achieve effective sealing between the labyrinth assembly 9 and the valve seat assembly 2. An annular groove can be provided on the abutment surface of the labyrinth assembly 9 and the valve seat assembly 2 to accommodate the metal C-type sealing ring 101, which can achieve radial limiting of the metal C-type sealing ring 101 and avoid sealing failure. In addition, since the metal C-type sealing ring 101 has a certain structural strength and resilience, it can better adapt to the pressure fluctuations between the labyrinth assembly 9 and the valve seat assembly 2, ensuring the sealing performance between the valve seat assembly 2 and the labyrinth assembly 9. At the same time, it prevents the vibration of the labyrinth assembly 9 from being directly transmitted to the valve seat assembly 2 when subjected to fluid forces, thus affecting the stability of the valve seat assembly 2. It can also further prevent the vibration from being indirectly transmitted to the sealing valve cover assembly 7 and the valve stem 32 through the valve seat assembly 2 and the porous sleeve 103, thus affecting the stability of the sealing valve cover assembly 7, the mounting bracket 5, and the valve stem 32.

[0098] Furthermore, the cooperation between the metal C-shaped sealing ring 101 and the elastic sealing ring 102, with the diameter of the metal C-shaped sealing ring 101 being smaller than the diameter of the elastic sealing ring 102 (i.e., the metal C-shaped sealing ring 101 being located radially inside the elastic sealing ring 102), enhances the sealing effect while ensuring the service life of the elastic sealing ring 102. Specifically, the metal C-shaped sealing ring 101 located on the inner ring achieves inner layer sealing and isolates the high-temperature and high-pressure environment inside the labyrinth-type pressure reducing valve from the elastic sealing ring 102, thus ensuring the service life of the elastic sealing ring 102. Simultaneously, the elastic sealing ring 102 located on the outer ring further enhances the sealing effect through its own elasticity. In addition, the elastic sealing ring 102 located on the outer ring also reduces vibration in the valve seat assembly 2, thereby ensuring the stability of the valve seat assembly 2 during installation.

[0099] Furthermore, the valve body assembly 1 has a threaded hole 15; the valve seat assembly 2 includes a first surface 201 facing the labyrinth assembly 9 and a second surface 202 facing the fixing assembly 8; the fixing assembly 8 includes a pressure ring 81, a first double-waisted self-locking washer 82, a locking bolt 83, a locking nut 84, a second double-waisted self-locking washer 85 and a third double-waisted self-locking washer 86.

[0100] Specifically, since the labyrinth component 9 vibrates under the action of fluid (such as steam), the first double-pad self-locking washer 82 is pressed onto the second surface 202 by the threaded connection between the pressure ring 81 and the threaded hole 15 on the valve body component 1, which can effectively prevent the valve seat component 2 from vibrating, and thus also effectively prevent the connection between the pressure ring 81 and the valve body component 1 from loosening.

[0101] Specifically, the second surface 202 is recessed away from the fixing component 8 to form a recess 2021; the locking bolt 83 passes through the locking nut 84, the second double-waisted self-locking washer 85, the pressure ring 81 and the third double-waisted self-locking washer 86 in sequence, and extends into the recess 2021; the locking bolt 83 is threadedly connected to the pressure ring 81, and the locking bolt 83 presses the third double-waisted self-locking washer 86 into the recess 2021; the locking bolt 83 is also threadedly connected to the locking nut 84, and the locking nut 84 presses the second double-waisted self-locking washer 85 onto the pressure ring 81.

[0102] It is easy to understand that the cooperation between the second double-waisted self-locking washer 85 and the third double-waisted self-locking washer 86 can further prevent the valve seat assembly 2 from vibrating, and thus effectively prevent the pressure ring 81 from loosening.

[0103] Furthermore, the thread direction between the locking bolt 83 and the locking nut 84, and the thread direction between the locking bolt 83 and the pressure ring 81 can be set in opposite directions to further ensure the stability of the installation between the pressure ring 81, the locking bolt 83 and the locking nut 84.

[0104] Furthermore, the locking bolt 83 extends into the groove 2021 provided on the second surface 202 and is threadedly connected to the pressure ring 81. This allows for adjustment of the contact force between the valve seat assembly 2 and the labyrinth assembly 9, and between the valve seat assembly 2 and the valve body assembly 1, maintaining it within a reasonable range. This prevents excessive contact force from causing vibrations of the labyrinth assembly 9 to be easily transmitted to the valve seat assembly 2, and from causing plastic deformation of the high-temperature and high-pressure resistant seals and sealing rings, thus affecting the sealing effect. Additionally, it prevents insufficient contact force from causing sealing failure between the labyrinth assembly 9 and the valve seat assembly 2, and between the valve seat assembly 2 and the valve body assembly 1.

[0105] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A bypass letdown valve for a high temperature gas cooled reactor, characterized in that, The bypass discharge valve comprises a valve body assembly (1), a valve seat assembly (2), a valve core assembly (3) and an actuator (4); The valve body assembly (1) has a fluid cavity (11); The valve seat assembly (2) is located in the fluid cavity (11) and has a communication flow channel (21) communicating the input end and the output end of the fluid cavity (11); The valve core assembly (3) comprises a valve core (31) and a valve rod (32), one end of the valve rod (32) is connected with the valve core (31), the other end of the valve rod (32) extends out of the fluid cavity (11) and is connected with the actuator (4) to drive the valve core (31) to seal or conduct the communication flow channel (21); the valve rod (32) is sealingly connected between the outer circumferential side of the valve rod (32) and the valve body assembly (1); Further comprising a mounting bracket (5) and a connecting piece (6), the mounting bracket (5) is fixedly mounted on the valve body assembly (1), and the connecting piece (6) is slidingly mounted on the mounting bracket (5); The actuator (4) has an output shaft (41), the output shaft (41) is connected with the valve rod (32) through the connecting piece (6); The connecting piece (6) is axially positionally connected with the output shaft (41) and axially positionally connected with the valve rod (32), and the output shaft (41) and the valve rod (32) have a preset interval therebetween; The mounting bracket (5) is provided with a mounting empty area (50); The valve body assembly (1) has an opening (12) communicating the fluid cavity (11) with an external space; The bypass discharge valve further comprises a sealing valve cover assembly (7), the sealing valve cover assembly (7) is crimped at the opening (12) by the mounting bracket (5); The sealing valve cover assembly (7) comprises a valve cover pull ring (71), a self-sealing valve cover (72) and a connecting part (73); The valve cover pull ring (71) is axially crimped by the mounting bracket (5) and is radially positionally connected on the valve body assembly (1); The self-sealing valve cover (72) is located radially inside the valve cover pull ring (71), and one end of the self-sealing valve cover (72) extends to the mounting empty area (50), and the other end of the self-sealing valve cover (72) is connected with a multi-hole sleeve (103); The connecting part (73) is located in the mounting empty area (50) and connects the valve cover pull ring (71) and the self-sealing valve cover (72); One end of the multi-hole sleeve (103) away from the self-sealing valve cover (72) abuts against the valve seat assembly (2) and forms a running cavity (104) of the valve core (31); The first sealing part (74) comprises a four-open ring (741), a self-sealing compression ring (742) and a self-sealing ring (743) arranged from top to bottom and abutting against each other, the four-open ring (741) is arranged around the outer circumferential side of the valve cover pull ring (71), the self-sealing compression ring (742) and the self-sealing ring (743) are arranged around the outer circumferential side of the self-sealing valve cover (72); the self-sealing ring (743) and the self-sealing valve cover (72) are sealingly connected through an outwardly inclined abutting surface.

2. The bypass discharge valve for a high temperature gas cooled reactor according to claim 1, wherein The connecting piece (6) is located in the installation space (50) and can slide in the installation space (50); The connecting piece (6) is detachably connected with the valve stem (32).

3. A bypass letdown valve for a high temperature gas cooled reactor according to claim 2, characterized in that The mounting bracket (5) comprises a plurality of connecting rods (51); The plurality of connecting rods (51) are arranged in a circular array around the central axis of the output shaft (41) to form the installation space (50).

4. A bypass letdown valve for a high temperature gas cooled reactor according to claim 3, characterized in that The distance between the connecting rod (51) and the central axis of the output shaft (41) gradually increases in the direction from the actuator (4) to the valve body assembly (1); The distance between the connecting rod (51) and the central axis of the output shaft (41) gradually increases in the direction from the actuator (4) to the valve body assembly (1); 5. A bypass letdown valve for a high temperature gas cooled reactor according to any one of claims 1 to 4, characterized in that, The mounting bracket (5) comprises a large end (52) fixedly connected with the valve body assembly (1) and a small end (53) for mounting the actuator (4); The size of the large end (52) is smaller than that of the small end (53), and / or the distance from the connection position of the large end (52) and the valve body assembly (1) to the central axis of the output shaft (41) is greater than the maximum distance from the outer edge of the small end (53) to the central axis of the output shaft (41).

6. A bypass letdown valve for a high temperature gas cooled reactor according to claim 3 or 4, characterized in that The connecting rod (51) is provided with a first reinforcing rib plate (54) at one end close to the actuator (4), and the first reinforcing rib plate (54) is in sliding connection with the connecting piece (6); The connecting rod (51) is provided with a second reinforcing rib plate (55) at one end close to the valve body assembly (1), and the second reinforcing rib plate (55) is located on the side of the connecting rod (51) away from the installation space (50). The valve body assembly (1) has an opening (12) communicating the fluid cavity (11) with the outside space; 7. A bypass letdown valve for a high temperature gas cooled reactor according to claim 3 or 4, characterized in that The valve seat assembly (2) is detachably mounted in the fluid cavity (11) through the opening (12); The valve stem (32) penetrates through the sealing valve cover assembly (7) and is in sealing connection with the valve body assembly (1) through the sealing valve cover assembly (7). The valve body assembly (1) has a first step (13) and a second step (14); 8. A bypass letdown valve for a high temperature gas cooled reactor according to claim 7, characterized in that The bypass discharge valve further comprises a fixing assembly (8) and a labyrinth assembly (9); The fixing assembly (8) is connected with the valve body assembly (1) and seals and presses the valve seat assembly (2) on the first step (13); The labyrinth assembly (9) is sealed and pressed on the second step (14) by the valve seat assembly (2); A metal C-shaped sealing ring (101) is arranged between the abutting surface of the labyrinth assembly (9) and the valve seat assembly (2); An elastic sealing ring (102) is arranged between the valve seat assembly (2) and the first step (13), and the elastic sealing ring (102) is located radially outside the metal C-shaped sealing ring (101). The valve body assembly (1) has a threaded hole (15); 9. A bypass letdown valve for a high temperature gas cooled reactor according to claim 8, characterized in that The valve seat assembly (2) comprises a first surface (201) facing the labyrinth assembly (9) and a second surface (202) facing the fixing assembly (8); The valve body assembly (1) has a threaded hole (15); The fixing assembly (8) comprises a compression ring (81), a first double-pad self-locking washer (82), a locking bolt (83), a locking nut (84), a second double-pad self-locking washer (85) and a third double-pad self-locking washer (86); The compression ring (81) is threadedly connected with a threaded hole (15) on the valve body assembly (1) to press-connect the first double-pad self-locking washer (82) on the second surface (202); The second surface (202) is recessed away from the fixing assembly (8) to form a sink (2021); The locking bolt (83) penetrates the locking nut (84), the second double-pad self-locking washer (85), the compression ring (81) and the third double-pad self-locking washer (86) in sequence and extends into the sink (2021); The locking bolt (83) is threadedly connected with the compression ring (81), and the locking bolt (83) press-connects the third double-pad self-locking washer (86) in the sink (2021); The locking bolt (83) is also threadedly connected with the locking nut (84), and the locking nut (84) press-connects the second double-pad self-locking washer (85) on the compression ring (81).

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