Bypass drain valve for high-temperature gas cooled reactor

Abstract

The invention relates to a bypass drain valve for a high-temperature gas cooled reactor. The bypass drain valve comprises a valve body assembly, a valve seat assembly, a valve element assembly and an actuator. The valve body assembly is provided with a fluid cavity. The valve seat assembly is located in the fluid cavity and provided with a communicating flow channel communicating the input end and the output end of the fluid cavity. The valve element assembly comprises a valve element and a valve rod, one end of the valve rod is connected with the valve element, and the other end of the valve rod extends out of the fluid cavity to be connected with an actuator so as to drive the valve element to seal or communicate with the communicating flow channel. The peripheral side of the valve rod is hermetically connected with the valve body assembly; the valve further comprises an installation support and a connecting piece, the installation support is fixedly installed on the valve body assembly, and the connecting piece is installed on the installation support in a sliding mode. The actuator is provided with an output shaft which is connected with the valve rod through a connecting piece. The connecting piece is connected with the output shaft in an axial limiting mode and connected with the valve rod in an axial limiting mode, the preset distance is reserved between the output shaft and the valve rod, and the valve rod and an actuator can stably and reliably operate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluid control, and in particular to a bypass discharge valve for a high-temperature gas cooled reactor. BACKGROUND

[0002] Bypass discharge valves are often used to deal with extremely high pressure difference conditions to achieve smooth fluid pressure reduction, for example: often applied to the main steam system of a power plant turbine, the important system of a nuclear power plant, the key pressure reduction link of a large chemical plant, etc., the accuracy and stability of the bypass discharge valve control will affect the safety and efficiency of the entire system. The existing bypass discharge valve includes a valve body, a valve seat, a valve core, an actuator and a labyrinth assembly, etc. The actuator can drive the valve core to move so that the valve core cooperates with the valve seat installed on the valve body to achieve the on-off or opening degree adjustment of the bypass discharge valve. The labyrinth assembly is in communication with the valve seat and the flow passage on the valve body to gradually consume the pressure and energy of the passing fluid through multiple levels and detours, thereby achieving smooth pressure reduction.

[0003] For example, a kind of adjustable labyrinth minimum flow control valve disclosed in Chinese patent CN113124230A specifically discloses: including valve body, valve cover, valve core, valve seat, valve stem and actuator, the valve seat, valve core is located in valve body, one end of the valve stem extends into valve body and is connected with valve core, the other end extends out of valve cover and is connected with actuator. The control valve further includes a labyrinth disc assembly, the labyrinth disc assembly is fixedly arranged in the valve body, the labyrinth disc assembly is sleeved on the peripheral side of the valve core, and the labyrinth disc assembly includes a plurality of hollow labyrinth discs and a plurality of solid labyrinth discs.

[0004] In the above scheme, when the fluid flows through the flow passage of the valve seat, the valve core and the labyrinth disc assembly, the fluid will fluctuate violently and frequently due to the influence of factors such as changes in fluid pressure and changes in direction, which will cause the valve core to vibrate. The valve core is directly connected with the actuator through the valve stem, and the vibration of the valve core will be transmitted to the actuator through the valve stem, which will accelerate the fatigue and loosening of the internal parts of the actuator, affect the control accuracy of the actuator, and even cause damage to the actuator. In addition, in the above scheme, the actuator is directly connected with the valve stem, and when the axis of the valve stem and the output shaft of the actuator does not coincide, the force applied by the actuator to the valve stem will easily cause the valve stem to be subjected to bending stress. The valve stem is relatively long, which will easily cause the bending deformation of the valve stem, affecting the stable operation of the valve stem and the effective sealing of the bypass discharge valve. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the defects in the prior art and to provide a bypass discharge valve for a high-temperature gas cooled reactor.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: A bypass discharge valve for a high temperature gas cooled reactor, comprising 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 communicating 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 conduct the communication flow channel; the outer circumferential side of the valve rod is sealingly connected with the valve body assembly; Further comprising a mounting bracket and a connecting piece, the mounting bracket is fixedly mounted on the valve body assembly, and the connecting piece is slidingly mounted on the mounting bracket; The actuator has an output shaft, and 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 distance therebetween.

[0007] Preferably, the mounting bracket is provided with a mounting empty area; The connecting piece is located in the mounting empty area and can slide in the mounting empty area; The connecting piece is detachably connected with the valve rod.

[0008] Preferably, the mounting bracket comprises a plurality of connecting rods; The plurality of connecting rods are distributed in a circumferential array around the central axis of the output shaft to form the mounting empty area.

[0009] Preferably, along the direction from the actuator to the valve body assembly, the distance between the connecting rods and the central axis of the output shaft gradually increases at least partially; The distance changing position of the connecting rod is a circular arc transition surface.

[0010] Preferably, the mounting bracket comprises a large end fixedly connected with the valve body assembly and a small end for mounting the actuator; 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 with 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.

[0011] Preferably, one end of the connecting rod close to the actuator is provided with a first reinforcing rib plate, and the first reinforcing rib plate is slidingly connected with the connecting piece; And / or, The connecting rod is provided with a second reinforcing rib plate near one end of the valve body assembly, and the second reinforcing rib plate is located on the side of the connecting rod away from the installation empty area.

[0012] Preferably, the valve body assembly has an opening communicating the fluid cavity with an external space; The valve seat assembly is detachably installed in the fluid cavity through the opening; The bypass discharge valve further comprises a sealing valve cover assembly, which is crimped by the installation support at the opening; The valve rod penetrates through the sealing valve cover assembly and is sealingly connected with the valve body assembly through the sealing valve cover assembly.

[0013] Preferably, the sealing valve cover assembly comprises a valve cover pull ring, a self-sealing valve cover and a connecting part; The valve cover pull ring is axially crimped by the installation support and is radially limited on the valve body assembly; 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 installation empty area, and the other end is connected with a porous sleeve; The connecting part is located in the installation empty area and connects the valve cover pull ring and the self-sealing valve cover; One end of the porous sleeve away from the self-sealing valve cover abuts against the valve seat assembly and forms a running cavity of the valve core.

[0014] Preferably, the valve body assembly has a first step and a second step; The bypass discharge valve further comprises a fixing assembly and a labyrinth assembly; The fixing assembly is connected with the valve body assembly and sealingly crimps the valve seat assembly on the first step; The labyrinth assembly is sealingly crimped on the second step by the valve seat assembly; A metal C-shaped sealing ring is arranged between the abutting surface of the labyrinth assembly and the valve seat assembly; An elastic sealing ring is arranged between the valve seat assembly and the first step, and the elastic sealing ring is located radially outside the metal C-shaped sealing ring.

[0015] Preferably, the valve body assembly has a threaded hole; The valve seat assembly comprises a first surface facing the labyrinth assembly, and a second surface facing the fixing assembly; The fixing assembly comprises a compression ring, a first double-pad self-locking gasket, a locking bolt, a locking nut, a second double-pad self-locking gasket and a third double-pad self-locking gasket; The compression ring is threadedly connected with the threaded hole on the valve body assembly to crimp the first double-pad self-locking gasket on the second surface; The second surface is recessed in a direction away from the fixed assembly to form a sink; The locking bolt penetrates the locking nut, the second double-pad self-locking washer, the compression ring and the third double-pad self-locking washer in sequence and extends into the sink; The locking bolt is threadedly connected with the compression ring, and the locking bolt press-connects the third double-pad self-locking washer in the sink; The locking bolt is also threadedly connected with the locking nut, and the locking nut press-connects the second double-pad self-locking washer on the compression ring.

[0016] Compared with the prior art, the present application has the following beneficial effects: The connecting piece is slidably installed on the mounting bracket, that is, the output shaft drives the connecting piece to slide along the axial direction, thereby driving the valve rod to move. This arrangement makes the force applied by the output shaft not directly transmitted to the valve rod, but applied to the connecting piece, thereby absorbing the bending moment generated by the slight deviation of the central axes of the output shaft and the valve rod, avoiding the transmission of additional bending stress to the valve rod, effectively preventing the bending deformation of the valve rod, and also avoiding the accelerated wear of the seal on the outer periphery of the valve rod, thereby effectively ensuring the reliability of the seal on the periphery of the valve rod. Further, the connecting piece connects the valve rod and the output shaft and forms a predetermined spacing, which can avoid the transmission of fluid force acting on the valve core to the actuator through the valve rod, thereby avoiding damage to the actuator and improving the service life of the actuator. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0018] Figure 1 It is a structural schematic diagram of one of the examples of the present application.

[0019] Figure 2 It is a structural schematic diagram of one of the examples of the present application. Figure 1 It is an enlarged schematic diagram of D1 position in the figure.

[0020] Figure 3 It is a structural schematic diagram of one of the examples of the present application. Figure 1 It is a structural schematic diagram of one of the examples of the present application.

[0021] Figure 4 It is a structural schematic diagram of one of the examples of the present application.Figure 3 A cross-sectional diagram.

[0022] Figure 5 for Figure 4 An enlarged view of position D2 in the middle.

[0023] Figure 6 for Figure 4 Enlarged diagram of position D3 in the middle.

[0024] Explanation of reference numerals in the attached figures: 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

[0025] 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.

[0026] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] Referring to Figures 1 to 6 , the present application 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. Wherein, the valve body assembly 1 is the main part of the valve, and a fluid cavity 11 is formed in the inside of the valve body assembly 1, the valve seat assembly 2 is located in the fluid cavity 11, and the actuator 4 is used to drive the valve core assembly 3 to move, so that the valve core assembly 3 cooperates with the valve seat assembly 2 to control the opening, closing or opening degree adjustment of the bypass discharge valve.

[0029] Specifically, the fluid cavity 11 is divided into an input cavity 111 and an output cavity 112, and the valve seat assembly 2 is installed between the input cavity 111 and the output cavity 112; the valve seat assembly 2 has a communication flow channel 21 which communicates the input cavity 111 and the output cavity 112 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, and the other end extends to the outside 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 outer circumferential side of the valve rod 32 is sealingly connected with the valve body assembly 1 to ensure the sealing of the bypass discharge valve.

[0030] Referring to Figure 1 and Figure 4 , for the convenience of understanding, the upper side in the illustrated orientation is taken as the "upper" of the bypass discharge valve, the lower side in the illustrated orientation is taken as the "lower" of the bypass discharge valve, and the actuator 4, the valve rod 32, the valve core 31 and the valve seat assembly 2 are arranged from top to bottom. The center axis of the valve seat assembly 2 is taken as the "center" of the bypass discharge valve, and the center axis of the valve core 31 is taken as the "center" of the valve core assembly 3. Figure 1 and Figure 4the side of L1 shown in FIG. 1 as the "inner side", and the side opposite to the "inner side" as the "outer side". Figure 1 and Figure 4 the side of L1 shown in FIG. 1 as the "outer side".

[0031] It is not difficult to understand that when the actuator 4 drives the valve core 31 to move downward through the valve stem 32 to block the communication flow passage 21, the input cavity 111, the communication flow passage 21 and the output cavity 112 are cut off, and the bypass discharge valve is closed; when the actuator 4 drives the valve core 31 to move upward through the valve stem 32 to separate from the valve seat assembly 2, the communication flow passage 21 is conducted, the input cavity 111, the communication flow passage 21 and the output cavity 112 are communicated, the bypass discharge valve is opened, the fluid is input from the input cavity 111, and then discharged from the output cavity 112 after flowing through the communication flow passage 21.

[0032] It is worth mentioning that the above-mentioned fluid can be gas or liquid, which is determined by the application environment.

[0033] Referring to Figures 1 to 5 , the bypass discharge valve further comprises a mounting bracket 5 and a connecting piece 6. The mounting bracket 5 is fixedly installed on the valve body assembly 1, and the connecting piece 6 is slidingly installed on the mounting bracket 5. The actuator 4 has an output shaft 41, the output shaft 41 is connected with the valve stem 32 through the connecting piece 6, the connecting piece 6 is axially limitedly connected with the output shaft 41 and axially limitedly connected with the valve stem 32. That is, the output shaft 41 and the valve stem 32 are connected through the connecting piece 6, and the connecting piece 6 is slidingly installed on the mounting bracket 5, that is, the output shaft 41 drives the connecting piece 6 to slide along the axial direction, and then drives the valve stem 32 to move the valve core 31. This setting makes that even if there is a slight deviation between the central axes of the valve stem 32 and the output shaft 41, the force exerted by the output shaft 41 will not be directly transmitted to the valve stem 32, but will be exerted on the connecting piece 6, and the bending moment generated by the slight deviation of the central axes of the output shaft 41 and the valve stem 32 will be absorbed through the connecting piece 6, avoiding the transmission of additional bending stress to the valve stem 32, which can effectively avoid the bending deformation of the valve stem 32. At the same time, it can also avoid the lateral force acting on the valve stem 32, thereby avoiding the accelerated wear of the seal on the outer periphery of the valve stem 32, and thus effectively ensuring the reliability of the seal around the valve stem 32.

[0034] Further, the output shaft 41 and the valve stem 32 have a preset interval, when the valve core 31 is subjected to fluid force, it will not be directly transmitted to the output shaft 41 and other structures (such as internal driving components of pneumatic structure, driving gear, etc.) of the actuator 4 through the valve stem 32, thereby avoiding damage to the actuator 4, and being conducive to improving the service life of the actuator 4.

[0035] Referring to Figures 1 to 3The mounting bracket 5 is provided with a mounting empty area 50, the connecting piece 6 is located in the mounting empty area 50 and can slide in the mounting empty area 50, the connecting piece 6 is detachably connected with the valve rod 32, that is, the connecting position of the valve rod 32 and the connecting piece 6 is located in the mounting empty area 50, and the connecting piece 6 is detachable with the valve rod 32, thereby facilitating the disassembly and assembly of the two. When the actuator 4 needs to be overhauled, the valve rod 32 and the connecting piece 6 are only split, and the disassembly and assembly of the actuator 4 can be realized, without the need to disassemble the valve rod 32, so that the difficulty of overhaul can be effectively reduced, and the sealing performance of the bypass discharge valve is not affected.

[0036] Further, the valve core 31 can be a pilot balanced valve core (for specific structure and movement mode, refer to CN219911988U, which will not be described here), which includes a pilot valve core 311 and a main valve core 312, wherein the pilot valve core 311 is arranged in an integrated structure with the valve rod 32.

[0037] It is not difficult to understand that, since the actuator 4 does not need to be disassembled during disassembly and assembly, the pilot valve core 311 and the valve rod 32 are arranged in an integrated structure in the embodiment, which can not affect the disassembly and assembly of the actuator 4, can increase the structural strength of the valve rod 32 to a certain extent, and can ensure that the valve rod 32 has sufficient axial extension length.

[0038] Further, the connecting piece 6 and the valve rod 32 are connected by threads. Of course, it can be understood that the axial limiting connection between the two can be achieved, such as buckle connection, stepped shaft and stepped groove cooperation and the like. Similarly, the connecting piece 6 and the output shaft 41 can also be connected by threads, stepped shaft and stepped groove cooperation, buckle connection and the like to achieve axial limiting connection.

[0039] Further, the mounting bracket 5 includes a plurality of connecting rods 51; the plurality of connecting rods 51 are distributed in a circular array around the central axis of the output shaft 41 to form the mounting empty area 50, that is, the central axes of the output shaft 41, the connecting piece 6 and the valve rod 32 are closer to the central axis position of the mounting bracket 5, so that the mounting bracket 5 has better support effect on the output shaft 41, the valve rod 32 and the connecting piece 6, that is, the mounting bracket 5 can be more uniformly stressed when the acting force of the valve rod 32 is indirectly transmitted (that is, transmitted through the connecting piece 6 and the output shaft 41) to the mounting bracket 5, so that deformation of the mounting bracket 5 can be avoided.

[0040] Further, the distance between the connecting rod 51 and the central axis of the output shaft 41 gradually increases from top to bottom along the direction from the actuator 4 to the valve body assembly 1. Specifically, the connecting rod 51 comprises a first rod 511 and a second rod 512, the first rod 511 and the second rod 512 are arranged from top to bottom, and the distance between the first rod 511 and the central axis of the output shaft 41 is equal, and the distance between the second rod 512 and the central axis of the output shaft 41 gradually increases from top to bottom, so that the diameter of the end of the connecting rod 51 close to the valve body assembly 1 (i.e. the diameter of the circle circumscribed by the lower end of the second rod 512) is larger, which can increase the anti-torsion ability, and ensure the structural stability and support stability of the connecting rod 51 itself.

[0041] Further, the distance between the connecting rod 51 and the central axis of the output shaft 41 gradually increases from top to bottom along the direction from the actuator 4 to the valve body assembly 1. Specifically, the connecting rod 51 comprises a first rod 511 and a second rod 512, the first rod 511 and the second rod 512 are arranged from top to bottom, and the distance between the first rod 511 and the central axis of the output shaft 41 is equal, and the distance between the second rod 512 and the central axis of the output shaft 41 gradually increases from top to bottom, so that the diameter of the end of the connecting rod 51 close to the valve body assembly 1 (i.e. the diameter of the circle circumscribed by the lower end of the second rod 512) is larger, which can increase the anti-torsion ability, and ensure the structural stability and support stability of the connecting rod 51 itself.

[0042] Referring to Figures 1 to 4 Since the actuator 4 is fixed on the valve body assembly 1 through the mounting bracket 5, when the actuator 4 operates to control the opening, closing or opening degree adjustment of the bypass discharge valve, a certain torque will be generated, which will be transmitted to the valve body assembly 1 through the mounting bracket 5, at the same time, a moment will be generated on the mounting bracket 5 itself, which tries to make it "torsion" or "tilt", and then affects the stability of the mounting bracket 5 and the actuator 4. Therefore, in the embodiment, 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 the size of the small end 53, that is, the size of the end of the mounting bracket 5 connected with the valve body assembly 1 is larger than the size of the end of the mounting bracket 5 connected with the actuator 4. This setting can use the wider large end 52 to evenly disperse the force and torque applied by the actuator 4 to the small end 53 to a larger area (i.e. the area where the valve body assembly 1 is connected with the large end 52), which can avoid damage to the mounting bracket 5 itself due to stress concentration, and at the same time, the larger size of the large end 52 can increase the connection area between the large end 52 and the valve body assembly 1, avoid stress concentration at the connection position, and prevent local deformation of the valve body assembly 1.

[0043] Further, the distance between the connecting rod 51 and the central axis of the output shaft 41 gradually increases from top to bottom along the direction from the actuator 4 to the valve body assembly 1. Specifically, the connecting rod 51 comprises a first rod 511 and a second rod 512, the first rod 511 and the second rod 512 are arranged from top to bottom, and the distance between the first rod 511 and the central axis of the output shaft 41 is equal, and the distance between the second rod 512 and the central axis of the output shaft 41 gradually increases from top to bottom, so that the diameter of the end of the connecting rod 51 close to the valve body assembly 1 (i.e. the diameter of the circle circumscribed by the lower end of the second rod 512) is larger, which can increase the anti-torsion ability, and ensure the structural stability and support stability of the connecting rod 51 itself.

[0044] Specifically, the big end 52 and the small end 53 are both provided as a circular plate, wherein the outer diameter of the big end 52 is larger than the diameter of the small end 53, one end (the second rod 512) of the connecting rod 51 is connected with the big end 52, and the other end (the first rod 511) is connected with the small end 53, and the output shaft 41 extends through the circular hole in the middle of the small end 53 to the valve body assembly 1.

[0045] Specifically, the big end 52 and the small end 53 are both provided as a circular plate, wherein the outer diameter of the big end 52 is larger than the diameter of the small end 53, one end (the second rod 512) of the connecting rod 51 is connected with the big end 52, and the other end (the first rod 511) is connected with the small end 53, and the output shaft 41 extends through the circular hole in the middle of the small end 53 to the valve body assembly 1.

[0046] Further, the center axes of the output shaft 41, the valve stem 32, the valve seat assembly 2 and the valve core assembly 3 are arranged coaxially to further avoid the generation of lateral force.

[0047] Further, the center axes of the big end 52 and the small end 53 can also be coaxial with the output shaft 41 and the valve stem 32 to increase the support effect of the mounting bracket 5.

[0048] Referring to Figure 3 , the end of the connecting rod 51 close to the actuator 4 is provided with a first reinforcing rib plate 54, and the first reinforcing rib plate 54 is in sliding connection with the connecting piece 6.

[0049] Specifically, the output shaft 41 of the actuator 4 is in rotational fitting connection with the connecting piece 6, and the connecting piece 6 is in sliding installation on the first reinforcing rib plate 54. The power structure (such as a driving gear set) of the actuator 4 drives the output shaft 41 to rotate, and the output shaft 41 converts the rotation into linear motion (such as a threaded connection mode) to further drive the connecting piece 6 to slide along the first reinforcing rib plate 54. It is not difficult to understand that the first reinforcing rib plate 54 can not only increase the structural strength of the connecting rod 51, but also play a circumferential limiting and guiding role on the connecting piece 6. In addition, the connecting piece 6 is in rotational fitting connection with the output shaft 41, which can avoid that a large force is generated on the connecting piece 6 during the rotation of the output shaft 41 and is transmitted to the first reinforcing rib plate 54 and the connecting rod 51, thereby further increasing the structural stability of the connecting rod 51.

[0050] Further, the end of the connecting rod 51 close to the valve body assembly 1 is provided with a second reinforcing rib plate 55, and the second reinforcing rib plate 55 is located on the side of the connecting rod 51 away from the installation empty area 50 to increase the structural strength of the lower end (i.e. the second rod 512) of the connecting rod 51.

[0051] It is not difficult to understand that through the setting of the first reinforcing rib plate 54 and the second reinforcing rib plate 55, the neutral axis of the connecting rod 51 plate can still be on the middle plane of the plate, even if there is a force between the connecting piece 6 and the first reinforcing rib plate 54, the structural strength of the connecting rod 51 can be increased through the setting of the second reinforcing rib plate 55, the stability of the connecting rod 51 is ensured, the bending deformation or even the rupture of the connecting rod 51 is avoided, and the natural frequency of the entire mounting bracket 5 can also be adjusted through the setting of the first reinforcing rib plate 54 and the second reinforcing rib plate 55, so as to avoid resonance of the bypass exhaust valve.

[0052] Referring to Figure 1 , and Figure 4 and Figure 5 , the valve body assembly 1 has an opening 12 communicating the fluid cavity 11 with the outside space; the valve seat assembly 2 is detachably installed in the fluid cavity 11 through the opening 12. The bypass exhaust valve further comprises a sealing valve cover assembly 7, which is pressed by the mounting bracket 5 at the opening 12; the valve rod 32 penetrates through the sealing valve cover assembly 7 and is sealingly connected with the valve body assembly 1 through the sealing valve cover assembly 7, which is not only conducive to the disassembly and maintenance of the valve seat assembly 2, but also can ensure the effective sealing of the valve body assembly 1 and the valve rod 32.

[0053] In addition, the sealing valve cover assembly 7 is pressed by the mounting bracket 5 at the opening 12, which can further ensure the sealing effect of the sealing valve cover assembly 7.

[0054] Further, the sealing valve cover assembly 7 comprises a valve cover pull ring 71, a self-sealing valve cover 72 and a connecting part 73; wherein the valve cover pull ring 71 is axially pressed by the mounting bracket 5 and is 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 installation empty area 50, and the other end is connected with the multi-hole sleeve 103; the connecting part 73 is located in the installation 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.

[0055] It is not difficult to understand that the self-sealing valve cover 72 extends into the installation empty area 50, on the one hand, the connecting part 73 connects the valve cover pull ring 71 and the self-sealing valve cover 72 in the installation empty area 50, which is conducive to the assembly of the self-sealing valve cover 72; on the other hand, the self-sealing valve cover 72 can increase the circumferential limiting area of the valve rod 32, further avoiding excessive bending deformation of the valve core 31. Moreover, since the self-sealing valve cover 72 extends to the installation empty area 50, the valve rod 32 penetrates through the sealing valve cover assembly 7 and is connected with the connecting piece 6, so the sealing area of the valve rod 32 and the self-sealing valve cover 72 is located in the installation empty area 50, which is convenient for observation and maintenance of the sealing condition of the two.

[0056] In addition, the valve cover pull ring 71 is axially crimped and radially limited by the mounting bracket 5 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 be limited in the radial direction, ensuring the stability of the installation among the three, and at the same time, when the multi-hole sleeve 103 is impacted by fluid, the 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 avoiding the influence on the actuator 4.

[0057] Specifically, the connecting part 73 includes a crimping ring 731 and a limiting bolt 732, wherein the crimping ring 731 is threadedly connected with the part of the self-sealing valve cover 72 extending to the mounting space 50, and the limiting bolt 732 penetrates through the crimping ring 731 and extends into the groove provided on the self-sealing valve cover 72, and the limiting bolt 732 is threadedly connected with the crimping ring 731, and the limiting bolt 732 and the self-sealing valve cover 72 can be connected by one or more combinations of threaded connection, clamping, and insertion, which can ensure the stability of the connection and facilitate disassembly and assembly.

[0058] Further, the valve cover pull ring 71 and the valve body assembly 1 (that is, the inner wall surface of the opening 12) are sealingly connected through the first sealing part 74, and the self-sealing valve cover 72 and the valve body assembly 1 (that is, the inner wall surface of the opening 12) are sealingly connected through the first sealing part 74; the self-sealing valve cover 72 and the valve stem 32 are sealingly connected through the second sealing part 75.

[0059] Specifically, the first sealing part 74 includes a four-open ring 741, a self-sealing compression ring 742, and a self-sealing ring 743 arranged in abutment from top to bottom, the four-open ring 741 is arranged around the outer circumferential side of the valve cover pull ring 71, and 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 the outwardly inclined abutment surface.

[0060] 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 compression sleeve 755, a packing compression plate 756, a butterfly spring 757, a butterfly spring spacer sleeve 758, and a fastener 759. The packing pad 752, the sealing packing 753, the spacer ring 754, the packing compression sleeve 755, and the packing compression plate 756 are sleeved on the valve stem 32, and the packing compression plate 756 is connected with the self-sealing valve cover 72 through the fastener 759 to compress the packing pad 752, the sealing packing 753, the spacer ring 754, and the packing compression sleeve 755 in the sealing cavity 751, and in the sealing cavity 751, the packing compression sleeve 755, the sealing packing 753, the spacer ring 754, the sealing packing 753, and the packing pad 752 are sequentially stacked from top to bottom, wherein the sealing packing 753 can be provided in multiple layers. The fastener 759 is provided in the form of a bolt and a nut structure, and the butterfly spring 757 and the butterfly spring spacer sleeve 758 are compressed between the nut and the packing compression plate 756.

[0061] Referring to Figure 4 and Figure 6 , the valve body assembly 1 has a first step 13 and a second step 14; the bypass discharge valve further comprises a fixed assembly 8 and a labyrinth assembly 9; the fixed 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.

[0062] It is not difficult to understand that the metal C-shaped sealing ring 101 is arranged in a ring structure, and its cross-sectional area is "C" shaped, and its two ends are respectively abutted with the labyrinth assembly 9 and the valve seat assembly 2 to achieve effective sealing between the labyrinth assembly 9 and the valve seat assembly 2. An annular groove can be arranged on the abutting surface of the labyrinth assembly 9 and the valve seat assembly 2 to accommodate the metal C-shaped sealing ring 101, which can achieve radial limiting of the metal C-shaped sealing ring 101 and avoid sealing failure. In addition, since the metal C-shaped sealing ring 101 has a certain structural strength and resilience, it can better adapt to the pressure fluctuation between the labyrinth assembly 9 and the valve seat assembly 2, ensure the sealing performance between the valve seat assembly 2 and the labyrinth assembly 9, and at the same time, avoid the vibration of the labyrinth assembly 9 directly transmitted to the valve seat assembly 2 when the labyrinth assembly 9 is subjected to fluid force, which affects the stability of the valve seat assembly 2, and further avoids the indirect transmission to the sealing valve cover assembly 7 and the valve stem 32 through the valve seat assembly 2 and the multi-hole sleeve 103, which affects the stability of the sealing valve cover assembly 7, the mounting bracket 5 and the valve stem 32.

[0063] In addition, through the cooperation of the metal C-shaped sealing ring 101 and the elastic sealing ring 102, and the diameter of the metal C-shaped sealing ring 101 is smaller than the diameter of the elastic sealing ring 102 (that is, the metal C-shaped sealing ring 101 is located radially inside the elastic sealing ring 102), the sealing effect can be enhanced while the service life of the elastic sealing ring 102 is ensured. Specifically, the metal C-shaped sealing ring 101 located in the inner ring can realize inner sealing and can also realize the separation of the high-temperature and high-pressure environment inside the labyrinth pressure reducing valve and the elastic sealing ring 102, thereby ensuring the service life of the elastic sealing ring 102. At the same time, the elastic sealing ring 102 located in the outer ring can further enhance the sealing effect by using its own elasticity. In addition, the elastic sealing ring 102 located in the outer ring can also realize the vibration reduction of the valve seat assembly 2, thereby ensuring the stability of the valve seat assembly 2 installation.

[0064] Further, the valve body assembly 1 is provided with a threaded hole 15; the valve seat assembly 2 comprises a first face 201 facing the labyrinth assembly 9, and a second face 202 facing the fixing assembly 8; 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.

[0065] Specifically, since the labyrinth assembly 9 will vibrate under the action of fluid (such as steam), the first double-pad self-locking washer 82 is pressed on the second face 202 by the compression ring 81 threaded connected with the threaded hole 15 on the valve body assembly 1, which can effectively prevent the valve seat assembly 2 from vibrating, and further prevent the compression ring 81 from loosening with the valve body assembly 1.

[0066] Specifically, the second face 202 is recessed away from the fixing assembly 8 to form a recessed groove 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 recessed groove 2021; the locking bolt 83 is threaded connected with the compression ring 81, and the locking bolt 83 presses the third double-pad self-locking washer 86 in the recessed groove 2021; the locking bolt 83 is also threaded connected with the locking nut 84, and the locking nut 84 presses the second double-pad self-locking washer 85 on the compression ring 81.

[0067] It is not difficult to understand that the mutual cooperation of the second double-pad self-locking washer 85 and the third double-pad self-locking washer 86 can further prevent the valve seat assembly 2 from vibrating, and further prevent the compression ring 81 from loosening.

[0068] Further, the thread rotation direction between the locking bolt 83 and the locking nut 84, and the thread rotation direction between the locking bolt 83 and the compression ring 81 can be oppositely arranged, further ensuring the stability of the installation between the compression ring 81, the locking bolt 83 and the locking nut 84.

[0069] In addition, the locking bolt 83 extends into the recessed groove 2021 provided on the second face 202, and is threaded connected with the compression ring 81, which can adjust the abutting 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, so as to maintain it within a reasonable range, avoiding that the abutting force is too large to cause the vibration of the labyrinth assembly 9 easily transmitted to the valve seat assembly 2, and avoiding that the abutting force is too large to cause the plastic deformation of the high-temperature and high-pressure sealing element and the sealing ring, thereby affecting the sealing effect. In addition, it can also avoid that the abutting force is too small to cause the 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.

[0070] The above embodiments are only the preferred embodiments of the present application, and cannot be used to limit the protection scope of the present application, and any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the protection scope of the present application.

Claims

1. A bypass discharge valve for a high-temperature gas-cooled reactor, characterized in that, It includes 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 inside the fluid cavity (11) and has a connecting channel (21) that connects the input end and the output end of the fluid cavity (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 cavity (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). It also includes a mounting bracket (5) and a connector (6), wherein 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 a connector (6); The connector (6) is axially limited to the output shaft (41) and axially limited to the valve stem (32), and there is a preset distance between the output shaft (41) and the valve stem (32).

2. A bypass discharge valve for a high-temperature gas-cooled reactor according to claim 1, characterized in that, The mounting bracket (5) is provided with an installation empty area (50); The connector (6) is located within the mounting empty area (50) and is capable of sliding within the mounting empty area (50); The connector (6) is detachably connected to the valve stem (32).

3. A bypass discharge valve for a high-temperature gas-cooled reactor according to claim 2, characterized in that, The mounting bracket (5) includes several connecting rods (51); Several of the connecting rods (51) are arranged in a circular array around the central axis of the output shaft (41) to form the mounting empty area (50).

4. A bypass discharge valve for a high-temperature gas-cooled reactor according to claim 3, characterized in that, Along the direction from the actuator (4) to the valve body assembly (1), the distance of the connecting rod (51) from the central axis of the output shaft (41) gradually increases at least partially; The distance of the connecting rod (51) changes at a position with an arc transition surface.

5. A bypass discharge valve for a high-temperature gas-cooled reactor according to any one of claims 1-4, characterized in that, 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), and / or the distance from the connection position of the large end (52) with 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 discharge valve for a high-temperature gas-cooled reactor according to claim 3 or 4, characterized in that, The connecting rod (51) has 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); And / or, The connecting rod (51) is provided with a second reinforcing rib (55) at one end near the valve body assembly (1), and the second reinforcing rib (55) is located on the side of the connecting rod (51) away from the mounting void (50).

7. A bypass discharge valve for a high-temperature gas-cooled reactor according to claim 3 or 4, characterized in that, The valve body assembly (1) has an opening (12) that connects the fluid cavity (11) to the external space. The valve seat assembly (2) is detachably installed in the fluid cavity (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).

8. A bypass discharge valve for a high-temperature gas-cooled reactor according to claim 7, characterized in that, The sealing valve cover assembly (7) includes 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 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), while the other end is connected to the porous 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). 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).

9. A bypass discharge valve for a high-temperature gas-cooled reactor according to claim 7, characterized in that, The valve body assembly (1) has a first step (13) and a second step (14); The bypass discharge valve also includes a fixed component (8) and a labyrinth component (9). The fixing component (8) is connected to the valve body component (1) and seals the valve seat component (2) onto the first step (13); The labyrinthine component (9) is sealed and pressed against the second step (14) by the valve seat component (2); A metal C-shaped sealing ring (101) is provided between the abutting surfaces of the labyrinth component (9) and the valve seat component (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-shaped sealing ring (101).

10. A bypass discharge valve for a high-temperature gas-cooled reactor according to claim 9, characterized in that, The valve body assembly (1) has a threaded hole (15); The valve seat assembly (2) includes a first side (201) facing the labyrinth assembly (9) and a second side (202) facing the fixing assembly (8). The fixing component (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). The pressure ring (81) is threadedly connected to the threaded hole (15) on the valve body assembly (1) to press the first double-pad self-locking washer (82) onto the second surface (202); The second surface (202) is recessed away from the fixing component (8) to form a sinkhole (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 countersunk groove (2021). The locking bolt (83) is threadedly connected to the pressure ring (81), and the locking bolt (83) presses the third double-waist self-locking washer (86) into the groove (2021); The locking bolt (83) is also threadedly connected to the locking nut (84), and the locking nut (84) presses the second double-waist self-locking washer (85) onto the pressure ring (81).

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