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 with a fluid cavity and an opening, a valve seat assembly detachably installed in the fluid cavity through the opening, a sealing valve cover assembly detachably installed on the valve body assembly and sealing the opening, a valve core assembly installed on the sealing valve cover assembly, a labyrinth assembly comprising a first porous sleeve, a labyrinth part, a gland part and a welding part, one end of the first porous sleeve being crimped on the valve body assembly by the valve seat assembly, the other end being suspended in the fluid cavity, the gland part being screwed on the suspended end of the first porous sleeve in the fluid cavity to crimp the labyrinth part on the first porous sleeve, and the welding part fixedly connecting the gland part and the first porous sleeve and protruding from the connecting end faces of the two parts, which has the advantage of ensuring stable operation of the bypass discharge valve.

Description

Technical Field

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

[0002] Bypass valves used in high-temperature gas-cooled reactors are often used to cope with extreme pressure differential conditions in order to achieve smooth fluid pressure reduction. For example, they are often used in the main steam system of power plant turbines, important systems of nuclear power plants, and key pressure reduction links of large chemical plants. The accuracy and stability of bypass valve control will affect the safety and efficiency of the entire system.

[0003] Existing bypass discharge valves include a valve body, valve seat, valve core, and labyrinth assembly. The valve body, valve seat, and valve core work together to achieve the on / off switching of the labyrinth-type pressure reducing valve. The labyrinth assembly consists of several disc assemblies fixedly connected by fasteners, forming a servo mechanism and meandering flow channels between the disc assemblies to gradually dissipate the fluid's pressure and energy, thereby achieving smooth pressure reduction. For example, the patent with publication number CN204628787U discloses a stackable noise-reducing disc assembly, exhaust diffuser, and control valve. Specifically, it discloses that the use of the control valve 54 requires stacking multiple disc assemblies 10 to form an exhaust diffuser 100 or valve cage 52. Each disc assembly 10 constituting the exhaust diffuser 100 or valve cage 52 has multiple holes 32, thereby allowing vertical rods or through bolts 108 (see...) to pass through. Figure 3 The discs 10 can be placed in each hole 32, thereby aligning the stacked discs 10 in the vertical and horizontal directions, and the exhaust diffuser 100 or valve cage 52 formed by the multiple discs 10 is axially confined between the valve seats 62.

[0004] However, the pressure of the steam medium in the labyrinth assembly varies greatly, resulting in frequent vibrations and dynamic loads. When the discs of the labyrinth assembly are fixed with bolts, the bolt fixing can vibrate during the vibration process, affecting the vibration resistance of the entire labyrinth assembly and consequently the performance of the entire valve. Furthermore, the steam medium is usually at a high temperature. Under high-temperature conditions, the thermal expansion effect of the disc and bolt materials is significant. The exhaust diffuser 100 or valve cage 52 formed by multiple discs 10 is axially confined between valve seats 62. This may lead to stress concentration between adjacent discs, between discs and valve seats, and between discs and bolts due to thermal expansion, and may even cause structural deformation or fracture (discs, valve seats, bolts, etc.), thereby affecting the stable operation of the 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, comprising:

[0008] The valve body assembly has a fluid cavity and an opening connecting the fluid cavity to the external space;

[0009] A valve seat assembly is detachably installed within the fluid cavity through the opening;

[0010] A sealing valve cover assembly is detachably mounted on the valve body assembly and seals the opening;

[0011] A valve core assembly is mounted on the sealing valve cover assembly and cooperates with the valve seat assembly to control the opening or closing of the fluid chamber;

[0012] The labyrinth assembly includes a first porous sleeve, a labyrinth section, a pressure cap section, and a welding section;

[0013] One end of the first porous sleeve is pressed onto the valve body assembly by the valve seat assembly, and the other end is suspended in the fluid cavity;

[0014] The gland is threaded to one end of the first porous sleeve, which is suspended in the fluid cavity, so as to press the labyrinth part onto the first porous sleeve.

[0015] The welded part is fixedly connected to the pressure cap and the first porous sleeve, and protrudes from the connection end face of the two.

[0016] Preferably, the welded portion includes a first welding boss and a second welding boss;

[0017] The first welding boss protrudes from the connecting end face of the pressure cap, and the second welding boss protrudes from the connecting end face of the first porous sleeve.

[0018] The inner wall surface of the first welding boss abuts against the outer wall surface of the second welding boss, and the end of the first welding boss away from the pressure cap is welded to the end of the second welding boss away from the first porous sleeve.

[0019] Preferably, the first porous sleeve includes an annular sleeve and a bottom plate located at the end of the annular sleeve away from the valve seat assembly;

[0020] The labyrinth section includes a plurality of stacked disc assemblies, which are sleeved from one end of the base plate to the outer periphery of the annular cylinder;

[0021] The outer wall surface of the base plate is provided with several annular grooves, which are located above the threaded connection area between the pressure cap and the base plate.

[0022] Preferably, the end face of the pressure cap facing the labyrinth section has a limiting groove;

[0023] Each of the aforementioned disk assemblies is provided with positioning holes;

[0024] The maze assembly also includes a positioning pin, which passes through the positioning holes opposite to each other on all the disk assemblies and is inserted into the limiting groove. The outer wall of the positioning pin and the positioning hole have a deformation gap with a preset distance.

[0025] Preferably, the valve body assembly includes a first step and a second step;

[0026] The labyrinth assembly is sealed and pressed against the first step by the valve seat assembly;

[0027] The bypass discharge valve also includes a fixing component, which is connected to the valve body assembly and presses the valve seat assembly into the second step of the valve body assembly in a sealing manner.

[0028] and / or;

[0029] The bypass discharge valve also includes high-temperature and high-pressure resistant seals and sealing rings;

[0030] The high-temperature and high-pressure resistant sealing element is pressed between the labyrinth assembly and the valve seat assembly;

[0031] The sealing ring is pressed between the valve body assembly and the valve seat assembly;

[0032] The high-temperature and high-pressure resistant seal is located radially inside the sealing ring.

[0033] Preferably, the valve seat assembly has a recess on the side facing the fixing assembly;

[0034] 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;

[0035] The pressure ring is threadedly connected to the valve body assembly to press the first double-waist self-locking washer onto the valve seat assembly;

[0036] 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;

[0037] 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.

[0038] 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.

[0039] Preferably, the valve core assembly includes a valve stem, a valve core portion, an actuator, a mounting bracket, and a connector;

[0040] One end of the valve stem is connected to the valve core, and the other end extends to the outside of the fluid cavity and is connected to the actuator.

[0041] The actuator is mounted on the mounting bracket;

[0042] The actuator includes an output shaft, and the output shaft is connected to the valve stem via the connector.

[0043] The connector is slidably mounted on the mounting bracket;

[0044] 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.

[0045] Preferably, the mounting bracket has an installation empty area;

[0046] The connector is located within the mounting space and is capable of sliding within the mounting space;

[0047] The connector is detachably connected to the valve stem.

[0048] Preferably, the mounting bracket includes a plurality of connecting rods;

[0049] Several connecting rods are arranged in a circular array around the central axis of the output shaft to form the mounting empty area;

[0050] 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.

[0051] The distance of the connecting rod changes at a point with a circular arc transition surface.

[0052] Preferably, the mounting bracket is detachably connected to the valve body assembly and presses the sealing valve cover assembly onto the valve body assembly;

[0053] The valve stem passes through the sealing valve cover assembly and is sealed to the sealing valve cover assembly.

[0054] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0055] This invention provides a bypass discharge valve for a high-temperature gas-cooled reactor. By providing an opening in the valve body assembly and sealing the opening with a sealing valve cover assembly, it facilitates the installation and disassembly of the valve seat assembly and labyrinth assembly, while ensuring the sealing performance of the valve body assembly. Furthermore, by mounting the valve core assembly on the sealing valve cover assembly, it prevents the force of fluid impact on the valve core assembly from being directly transmitted to the valve body assembly, thus avoiding severe vibration of the valve body assembly and ensuring the stable operation of the bypass discharge valve as a whole.

[0056] As the main structure for pressure reduction, the labyrinth assembly is susceptible to fluid impact, and the large pressure difference when the fluid flows through it can easily lead to cavitation. Therefore, the above solution also presses the labyrinth assembly onto the valve body assembly via a valve seat assembly. Compared to a direct fixed connection between the labyrinth assembly and the valve seat assembly or the valve body assembly, this method can offset some of the energy through the action and reaction forces between the contact surfaces, preventing the forces on the labyrinth assembly from being directly transmitted to the valve body assembly and valve seat assembly. This avoids local deformation of the valve body assembly and valve seat assembly, which could affect the sealing performance and operational stability of the bypass discharge valve. Simultaneously, the press-fitting and limiting mechanism between the labyrinth assembly and the valve body assembly ensures stable installation of the labyrinth assembly, preventing it from shaking and colliding with the valve seat assembly or valve core assembly during fluid impact. This, in turn, prevents damage to the valve core assembly, valve seat assembly, and labyrinth assembly, and avoids noise generation.

[0057] Furthermore, in the above-described scheme, the lower end of the first porous sleeve is suspended, and the labyrinth section is installed on the outer periphery of the first porous sleeve. That is, the labyrinth section and the first porous sleeve are partially suspended relative to the valve body. Compared to axially limiting both ends of the labyrinth assembly to the valve body, this arrangement allows the labyrinth section a certain degree of axial freedom of expansion and contraction, effectively absorbing displacement caused by thermal expansion, reducing internal stress, and improving the thermal stability of the labyrinth section, the first porous sleeve, and the valve seat. Moreover, the slight floating of the labyrinth assembly can absorb some vibration energy, reducing the risk of fatigue damage to the labyrinth section.

[0058] Furthermore, the labyrinth section is pressed onto the first porous sleeve by threaded connection between the gland section and the first porous sleeve. In other words, the threaded connection allows for pre-fixation and adjustment of the labyrinth section. This enables adjustment of the contact force and gap between the layers of the labyrinth section during the assembly of the labyrinth assembly, ensuring that the labyrinth flow channel formed between the layers of the labyrinth section maintains the design accuracy and ensures stable fluid dynamic performance.

[0059] Meanwhile, by welding the first porous sleeve and the pressure cap, the first porous sleeve and the pressure cap are integrated into a single structure. This prevents relative wobbling between the pressure cap and the first porous sleeve when the labyrinth assembly is subjected to frequent vibrations and dynamic loads. This ensures the stability of the threaded connection between the pressure cap and the first porous sleeve, thereby ensuring the stability of the labyrinth crimp and guaranteeing the vibration resistance of the entire labyrinth assembly.

[0060] In addition, the welded part protrudes from the connecting end face of the gland part and the first porous sleeve, so that when the labyrinth part needs to be inspected and studied, the welded part can be ground off. At this time, the labyrinth part can be disassembled after the gland part is unscrewed from the first porous sleeve, which facilitates the disassembly of the labyrinth part. Attached Figure Description

[0061] 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.

[0062] Figure 1 This is a schematic diagram of one example of the bypass discharge valve provided by the present invention.

[0063] Figure 2 for Figure 1 A cross-sectional diagram.

[0064] Figure 3 for Figure 2 A schematic diagram of the structure of the maze component.

[0065] Figure 4 for Figure 3 An enlarged view of position D1 in the middle.

[0066] Figure 5 for Figure 3 An enlarged view of position D2 in the middle.

[0067] Figure 6 for Figure 3 An exploded view of the mid-plate assembly.

[0068] Figure 7 This is a partial cross-section showing the positions of the locating pin and the disk assembly.

[0069] Figure 8 for Figure 7 Enlarged diagram of position D3 in the middle.

[0070] Figure 9 for Figure 2Enlarged diagram of position D4 in the middle.

[0071] Figure 10 for Figure 2 Enlarged diagram of position D5 in the middle.

[0072] Figure 11 for Figure 1 Enlarged diagram of position D6 in the middle.

[0073] Figure 12 for Figure 1 A schematic diagram of the mounting bracket.

[0074] Figure 13 for Figure 2 Enlarged diagram of position D7 in the middle.

[0075] Explanation of reference numerals in the attached figures:

[0076] 1. Valve body assembly; 101. First step; 102. Second step; 103. Third step; 11. Fluid chamber; 111. Inlet chamber; 112. Outlet chamber; 12. Opening; 13. Threaded hole; 2. Valve seat assembly; 201. Flow channel; 21. Slot; 3. Sealing valve cover assembly; 31. Valve cover pull ring; 32. Self-sealing valve cover; 33. Connecting part; 331. Crimping ring; 332. Limiting bolt; 34. First sealing part; 341. Four-open ring; 342. Self-sealing pressure ring; 343. Self-sealing ring; 35. Second sealing part; 351. Sealing cavity; 352. Packing gasket; 353. Sealing packing; 354. Spacer ring; 355. Packing sleeve; 356. Packing pressure plate; 357. Butterfly spring; 358. Butterfly spring spacer; 359. Fastener; 4. Valve core assembly; 41. Valve stem; 42. Valve core section; 421. Pilot valve core; 422. Main valve core; 43. Actuator; 431. Output shaft; 44. Mounting bracket; 440. Mounting void; 441. Connecting rod; 4411. First rod; 4412. Second rod; 4413. Arc segment; 442. Large end; 443. Small end; 444. First reinforcing rib plate; 445. Second reinforcing rib plate; 45. Connector; 5. Labyrinth assembly; 501. Hollow flow channel; 502. Labyrinth flow channel; 503. Annular groove; 51. First perforated sleeve; 511. Annular cylinder; 512. Base plate; 5121. First part; 5122. Second part; 5123. Connecting groove area; 5124. Straight pipe; 513. Stepped shaft; 52. Labyrinth section; 521. Disc assembly; 5211. Inner disc; 5212. Outer disc; 5213. Spacer disc; 5214. 5215. Through hole; 522. Opening groove; 523. Disc top ring; 524. Disc bottom ring; 53. Pressure cap; 54. Welding part; 545. First welding boss; 546. Second welding boss; 57. Limiting groove; 58. Positioning hole; 59. Positioning pin; 60. Deformation gap; 61. Fixing component; 62. Pressure ring; 63. First double-waisted self-locking washer; 64. Locking bolt; 65. Locking nut; 66. Second double-waisted self-locking washer; 7. High temperature and high pressure resistant seal; 8. Sealing ring; 9. Second multi-hole sleeve. Detailed Implementation

[0077] 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.

[0078] 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.

[0079] 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.

[0080] See Figures 1 to 13 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 sealing valve cover assembly 3, a valve core assembly 4, and a labyrinth assembly 5.

[0081] The valve body assembly 1 has a fluid chamber 11 and an opening 12 connecting the fluid chamber 11 to an external space. The valve seat assembly 2 is detachably mounted within the fluid chamber 11 through the opening 12, dividing the fluid chamber 11 into an input chamber 111 and an output chamber 112. The sealing valve cover assembly 3 is detachably mounted on the valve body assembly 1 and seals the opening 12 to ensure the fluid chamber 11 is airtight. The valve core assembly 4 is mounted on the sealing valve cover assembly 3 and cooperates with the valve seat assembly 2 to control the opening or closing of the fluid chamber 11. The labyrinth assembly 5 is pressed onto the valve body assembly 1 by the valve seat assembly 2. Specifically, the labyrinth assembly 5 is pressed downstream of the valve seat assembly 2, meaning it is located within the output chamber 112.

[0082] It is easy to understand that in the above solution, by providing an opening 12 on the valve body assembly 1 and sealing the opening 12 with the sealing valve cover assembly 3, on the one hand, it facilitates the installation and removal of the valve seat assembly 2 and the labyrinth assembly 5 through the opening 12; on the other hand, it ensures the sealing performance of the valve body assembly 1. Furthermore, the valve core assembly 4 is mounted on the sealing valve cover assembly 3, which prevents the force of the valve core assembly 4 from being directly transmitted to the valve body assembly 1 when subjected to fluid impact, thus avoiding severe vibration of the valve body assembly 1 and affecting the overall stable operation of the bypass discharge valve. Furthermore, since the labyrinth assembly 5 is the main structure for pressure reduction, it is easily affected by fluid impact, and the pressure difference is large when the fluid flows through the labyrinth assembly 5, which can easily lead to cavitation. Therefore, the above solution also presses the labyrinth assembly 5 onto the valve body assembly 1 through the valve seat assembly 2. Compared with the direct fixed connection between the labyrinth assembly 5 and the valve seat assembly 2 or the direct fixed connection between the labyrinth assembly 5 and the valve body assembly 1, a certain amount of energy can be offset by the action and reaction forces between the contact surfaces (such as the contact surface between the valve seat assembly 2 and the labyrinth assembly 5, and the contact surface between the labyrinth assembly 5 and the valve body assembly 1). This avoids the force on the labyrinth assembly 5 being directly transmitted to the valve body assembly 1 and the valve seat assembly 2, and avoids local deformation of the valve body assembly 1 and the valve seat assembly 2, which would affect the sealing performance and operational stability of the bypass discharge valve. Meanwhile, the labyrinth assembly 5 is limited by the press-fit between the valve body assembly 1 and the valve seat assembly 2, which can ensure the stable installation of the labyrinth assembly 5, so as to avoid the labyrinth assembly 5 shaking during the process of being impacted by the fluid and colliding with the valve seat assembly 2 or the valve core assembly 4, thereby avoiding noise and preventing damage to the valve core assembly 4, the valve seat assembly 2 and the labyrinth assembly 5, which would affect the stable operation of the bypass discharge valve.

[0083] Specifically, the labyrinth assembly 5 includes a first porous sleeve 51, a labyrinth section 52, a gland section 53, and a welded section 54. One end of the first porous sleeve 51 is pressed against the valve body assembly 1 by the valve seat assembly 2, while the other end is suspended within the fluid cavity 11. That is, the labyrinth section 52 and the first porous sleeve 51 are partially suspended relative to the valve body assembly 1. Compared to axially limiting both ends of the labyrinth assembly 5 to the valve body, this arrangement allows the labyrinth section 52 a certain degree of axial freedom of expansion and contraction, effectively absorbing displacement caused by thermal expansion, reducing internal stress, and improving the thermal stability of the labyrinth section 52, the first porous sleeve 51, and the valve seat. Furthermore, the slight floating of the labyrinth assembly 5 can absorb some vibration energy, reducing the risk of fatigue damage to the labyrinth section 52. The pressure cap 53 is threadedly connected to one end of the first porous sleeve 51, which is suspended in the fluid cavity 11, to press the labyrinth section 52 onto the first porous sleeve 51. This allows for pre-fixation and adjustment of the labyrinth section 52, and enables adjustment of the contact force and gaps between the layers of the labyrinth section 52 during the assembly of the labyrinth assembly 5. This ensures that the labyrinth flow channels 502 formed between the layers of the labyrinth section 52 maintain their design accuracy and ensures stable fluid dynamic performance. The welding part 54 fixes the pressure cap 53 and the first porous sleeve 51, forming an integral structure. This prevents relative wobbling between the pressure cap 53 and the first porous sleeve 51 during frequent vibrations and dynamic loads, ensuring the stability of the threaded connection between the pressure cap 53 and the first porous sleeve 51, thus ensuring the stability of the press-fitting of the labyrinth section 52 and the vibration resistance of the entire labyrinth assembly 5. Furthermore, the welded part 54 protrudes from the connecting end face of the pressure cap part 53 and the first porous sleeve 51, so that when the labyrinth part 52 needs to be inspected and studied, the welded part 54 can be ground off. At this time, the labyrinth part 52 can be disassembled after the pressure cap part 53 is unscrewed from the first porous sleeve 51.

[0084] In other words, in the above scheme, the valve seat assembly 2, the sealing valve cover assembly 3, the valve core assembly 4 and the labyrinth assembly 5 work together to increase the overall stability of the bypass discharge valve and facilitate the disassembly and maintenance of the valve seat assembly 2, the labyrinth assembly 5 and the labyrinth part 52 of the labyrinth assembly 5.

[0085] Furthermore, the valve seat assembly 2 has a connecting flow channel 201 that connects the input chamber 111 and the output chamber 112, and the labyrinth assembly 5 has a hollow flow channel 501 and a labyrinth flow channel 502. The input chamber 111, the connecting flow channel 201, the hollow flow channel 501, the labyrinth flow channel 502, and the output chamber 112 are connected in sequence. When the valve core assembly 4 and the valve seat assembly 2 cooperate to control the fluid chamber 11 to be open (that is, when the input chamber 111 and the output chamber 112 are open), the steam medium is input from the input chamber 111, and flows through the connecting flow channel 201, the hollow flow channel 501, and the labyrinth flow channel 502 in sequence before being output from the output chamber 112.

[0086] See Figures 2 to 8 The first porous sleeve 51 includes an annular cylinder 511, and a base plate 512 and a stepped shaft 513 respectively connected to both ends of the annular cylinder 511. The base plate 512 is located at the end of the annular cylinder 511 away from the valve seat assembly 2 and is used for threaded connection with the gland portion 53. The stepped shaft 513 is pressed onto the valve body assembly 1 by the valve seat assembly 2.

[0087] It is easy to understand that the inner sides of the annular cylinder 511, the bottom plate 512, and the stepped shaft 513 form a hollow flow channel 501, and the annular cylinder 511 is provided with several connecting holes in the radial direction to connect the hollow flow channel 501 and the labyrinth flow channel 502 formed on the labyrinth section 52.

[0088] Furthermore, due to the influence of the high-temperature steam medium, the first porous sleeve 51 is prone to thermal stress due to heat. In particular, the ring cylinder 511 is provided with connecting holes, which weakens the strength of the ring cylinder 511 to a certain extent, allowing it to undergo slight deformation or bending, thereby releasing thermal stress and avoiding stress concentration.

[0089] However, in order to ensure a stable connection between the first porous sleeve 51 and the pressure cap 53, and to enable the cover plate to apply sufficient compressive force to the labyrinth section 52, the base plate 512 is usually a plate-shaped structure (circular plate) with a relatively large thickness. This will cause the stress of the base plate 512 to be concentrated at the constraint points and geometric abrupt changes (such as the connection points, corners, etc.) when it is heated and expanded, that is, at the connection position between the base plate 512 and the ring cylinder 511, and at the threaded connection position between the base plate 512 and the pressure cap 53. This will lead to the instability of the connection between the pressure cap 53 and the base plate 512, and affect the stability of the connection between the ring cylinder 511 and the base plate 512. Therefore, in this embodiment, the outer wall surface of the base plate 512 is provided with several annular grooves 503 distributed along its axial direction, and the annular grooves 503 are located above the threaded connection groove area 5123 between the pressure cap 53 and the base plate 512. By setting the annular grooves 503, the stress transmission path of the base plate 512 can be changed, and the stress can be redistributed on both sides of the annular grooves 503, avoiding the formation of excessively high stress peaks in a certain local area, and ensuring the stability of the connection between the ring cylinder 511 and the base plate 512, and between the pressure cap 53 and the base plate 512. Furthermore, the setting of the annular grooves 503 allows the annular grooves 503 to play a "crack-stopping" role even if a small crack occurs at the end of the base plate 512 near the steam medium. Because the root of the annular groove 503 is an open notch, its stress field is different from that of the crack tip, which can prevent the crack from continuing to propagate at the threaded connection between the pressure cap 53 and the base plate 512, ensuring the stability of the connection between the two, and further ensuring the stability of the installation of the labyrinth part 52.

[0090] Furthermore, the inner wall of the annular groove 503 is an arc surface. The arc transition design of the annular groove 503 helps to smooth the stress gradient and reduce the stress concentration factor.

[0091] Furthermore, along the axial direction of the first porous sleeve 51, there are two annular grooves 503.

[0092] Furthermore, the base plate 512 includes a first part 5121 and a second part 5122; wherein, the first part 5121 is connected between the second part 5122 and the ring cylinder 511; the diameter of the first part 5121 is larger than that of the second part 5122, so as to form a connecting groove area 5123 between the two; an annular groove 503 is formed on the outer wall surface of the first part 5121; and an external thread is formed on the outer wall surface of the second part 5122 for threaded connection with the pressure cap 53.

[0093] It is easy to understand that the formation of the connecting groove area 5123 can facilitate the processing of external threads on the one hand, and on the other hand, it can also prevent the slight deformation of the first part 5121 from affecting the stability of the connection between the gland part 53 and the second part 5122.

[0094] Furthermore, the outer walls of the first part 5121, the second part 5122, and the connecting groove area 5123 can be connected by arcs to avoid stress concentration.

[0095] Furthermore, the base plate 512 (specifically the second part 5122) is also provided with a straight pipe 5124. Specifically, the straight pipe 5124 penetrates the base plate 512 to directly connect the inside and outside of the first porous sleeve 51, so that most of the steam medium is output from the inside of the first porous sleeve 51 (i.e., the hollow flow channel 501) to the outside of the first porous sleeve 51 (i.e., the output chamber 112) through the labyrinth flow channel 502 of the labyrinth part 52, while a small portion of the steam medium can be directly output from the inside of the first porous sleeve 51 (i.e., the hollow flow channel 501) to the outside of the first porous sleeve 51 (i.e., the output chamber 112) through the straight pipe 5124. This helps to disperse the flow pressure of the steam medium, reduce the vibration and noise of the labyrinth assembly 5, and at the same time ensure the effective discharge of the steam medium and guarantee the sealing performance of the valve system equipped with the labyrinth assembly 5.

[0096] See Figures 2 to 8 The maze section 52 includes a plurality of stacked disk assemblies 521. The disk assemblies 521 are fitted from one end of the base plate 512 to the outer periphery of the ring cylinder 511 and are pressed by the cover portion 53 onto the abutment surface of the stepped shaft 513 facing the ring cylinder 511. Specifically, the disk assembly 521 includes an inner disk 5211, an outer disk 5212, and spacer disks 5213. The inner disc 5211 and the outer disc 5212 are provided with several through holes 5214, and the outer disc 5212 is also provided with several opening slots 5215 that communicate with the interior of the first porous sleeve 51. The outer disc 5212 is stacked on both sides of the inner disc 5211, and the spacer disc 5213 is stacked on the side of the outer disc 5212 away from the inner disc 5211. When the inner disc 5211, the outer disc 5212 and the spacer disc 5213 are stacked, the through holes 5214 and the opening slots 5215 form a labyrinth flow channel 502.

[0097] Understandably, the inner disc 5211 has a through hole 5214, and the outer disc 5212 has an opening slot 5215 and a through hole 5214, which would reduce the structural strength of the inner and outer discs 5211 and 5212. The spacer disc 5213, however, ensures that when the inner disc 5211, outer disc 5212, and spacer disc 5213 are stacked and compressed, the inner disc 5211 and outer disc 5212 experience more even stress, preventing deformation of the inner and outer discs 5211 and 5212.

[0098] Furthermore, the labyrinth section 52 also includes a disk top ring 522 and a disk bottom ring 523; the disk top ring 522 is located between the uppermost disk assembly 521 and the stepped shaft 513; the disk bottom ring 523 is located between the lowermost disk assembly 521 and the pressure cap section 53. The hardness of the disk top ring 522 can be set between the hardness of the disk assembly 521 and the hardness of the stepped shaft 513, and the hardness of the disk bottom ring 523 can be set between the hardness of the pressure cap section 53 and the hardness of the disk assembly 521, so that the disk top ring 522 and the disk bottom ring 523 can serve as a transition buffer structure, which can ensure the stable installation of the disk assembly 521 and prevent the disk assembly 521 from being squeezed and deformed.

[0099] See Figures 2 to 8 In order to achieve the positioning and installation of the maze section 52, in this embodiment, the end face of the pressure cover 53 facing the maze section 52 has a limiting groove 55; each disk assembly 521 is provided with a positioning hole 56; the disk top ring 522 and the disk bottom ring 523 are also provided with corresponding positioning holes 56; the maze assembly 5 also includes a positioning pin 57, which passes through all disk assemblies 521, as well as the positioning holes 56 provided opposite to each other on the disk top ring 522 and the disk bottom ring 523, and is inserted into the limiting groove 55 to facilitate the positioning and installation of the maze section 52.

[0100] Furthermore, there is a pre-set deformation gap 58 between the outer wall surface of the locating pin 57 and the locating hole 56. The deformation gap 58 can be set according to the amount of material expansion within the corresponding steam medium temperature range, for example, it can be set to 0.1mm, 0.2mm, 0.5mm or 1mm.

[0101] It is easy to understand that the deformation gap 58 prevents stress concentration between the positioning pin 57 and the disk assembly 521 due to thermal expansion under high-temperature conditions, thus avoiding deformation or breakage of the disk assembly 521 and the positioning pin 57, ensuring the effectiveness of the labyrinth section 52. Furthermore, because the deformation gap 58 allows for a small relative rotation angle of the disk assembly 521, it does not affect the design accuracy of the labyrinth flow channel 502 formed after the disk assembly 521 is assembled, ensuring stable fluid dynamic performance.

[0102] See Figures 2 to 4 The welding part 54 includes a first welding boss 541 and a second welding boss 542; the first welding boss 541 protrudes from the connecting end face of the pressure cap part 53, and the second welding boss 542 protrudes from the connecting end face of the first porous sleeve 51; the inner wall surface of the first welding boss 541 abuts against the outer wall surface of the second welding boss 542, and the end of the first welding boss 541 away from the pressure cap part 53 is welded to the end of the second welding boss 542 away from the first porous sleeve 51.

[0103] It is easy to understand that by having the inner wall surface of the first welding boss 541 and the outer wall surface of the second welding boss 542 abut against each other, and by welding the first welding boss 541 and the second welding boss 542 at the end away from the pressure cap 53 and the first porous sleeve 51, a stable connection between the pressure cap 53 and the first porous sleeve 51 can be achieved, and the solder can be prevented from penetrating between the first porous sleeve 51 and the pressure cap 53. This makes it easier to grind away the welded part 54 during subsequent maintenance. At the same time, it can be ensured that after the welded part 54 is ground away, the pressure cap 53 can be unscrewed from the first porous sleeve 51.

[0104] It is worth noting that "the inner wall surface of the first welding boss 541 abuts against the outer wall surface of the second welding boss 542" can be the entire outer wall surface abutting or only a portion of the outer wall surface abutting, as long as it can ensure that the cover part 53 and the first porous sleeve 51 can be disassembled after the welding part 54 is ground away.

[0105] See Figure 3 and Figure 4 In this embodiment, a solder filling area is formed at the lower end of the first welding boss 541 and the second welding boss 542 (i.e., the first welding boss 541 and the second welding boss 542 are both provided with inclined surfaces, and the inclined surfaces form a solder filling area) to increase the welding stability of the first welding boss 541 and the second welding boss 542.

[0106] Furthermore, the first welding boss 541 and the second welding boss 542 are arranged in a ring to increase the connection area and ensure the stability and sealing of the connection.

[0107] Furthermore, the first welding boss 541 is integrally formed with the pressure cap 53, and the second welding boss 542 is integrally formed with the first porous sleeve 51, thereby increasing the stability of the connection between the pressure cap 53 and the first porous sleeve 51. Of course, in other embodiments, the first welding boss 541 can be welded to the pressure cap 53, and the second welding boss 542 can be welded to the first porous sleeve 51, so that after the welding portion 54 is ground off, the first welding boss 541 and the second welding boss 542 can be re-welded to the pressure cap 53 and the first porous sleeve 51 respectively, facilitating secondary assembly.

[0108] See Figure 1 , Figure 2 , Figure 9 and Figure 10 The valve body assembly 1 includes a first step 101 and a second step 102; wherein, the labyrinth assembly 5 is sealed and pressed against the first step 101 by the valve seat assembly 2; the bypass discharge valve also includes a fixing assembly 6, which is connected to the valve body assembly 1 and seals and presses the valve seat assembly 2 against the second step 102 of the valve body assembly 1.

[0109] When the fixing component 6 is connected to the valve body assembly 1, it can apply a thrust to the valve seat assembly 2, pushing the valve seat assembly 2 to abut tightly against the second step 102 of the valve body assembly 1. This ensures the stable installation of the valve seat assembly 2 and increases the sealing performance between the valve seat assembly 2 and the valve body assembly 1. Simultaneously, the valve seat assembly 2 can further push the labyrinth assembly 5 against the first step 101 of the valve body assembly 1, increasing the stability of the labyrinth assembly 5 installation and its sealing performance with the valve body assembly 1. When the fixing component 6 is removed from the valve body assembly 1, the valve seat assembly 2 and the labyrinth assembly 5 are no longer subjected to compressive force, thus facilitating their disassembly. In other words, the fixing component 6 achieves both stable installation and sealing performance between the valve body assembly 1, the valve seat assembly 2, and the labyrinth assembly 5, while also facilitating the assembly and disassembly of the valve seat assembly 2 and the labyrinth assembly 5.

[0110] It is worth noting that since the second step 102 is formed on the valve body assembly 1, the valve body assembly 1 has two inner wall surfaces with different diameters and a stepped surface corresponding to the position of the second step 102. Correspondingly, the valve seat assembly 2 can also form a stepped structure corresponding to the second step 102, so that when the valve seat assembly 2 is pressed onto the second step 102, the valve body assembly 1 can simultaneously achieve axial and radial limiting of the valve seat assembly 2, preventing the valve seat assembly 2 from wobbling in the axial and radial directions and ensuring the stability of the valve seat assembly 2 installation. Similarly, the upper end of the labyrinth assembly 5 can also form a stepped structure corresponding to the first step 101, so that when the labyrinth assembly 5 is pressed onto the first step 101, the valve body assembly 1 can achieve axial and radial limiting of the labyrinth assembly 5, preventing the labyrinth assembly 5 from wobbling in the axial and radial directions and ensuring the stability of the labyrinth assembly 5 installation.

[0111] It should be understood that the outer diameter of the first step 101 is equal to the inner diameter of the second step 102, which facilitates the sequential installation of the labyrinth assembly 5 and the valve seat assembly 2.

[0112] Furthermore, the bypass discharge valve also includes a second porous sleeve 9, which is fixedly connected to the sealing valve cover assembly 3 and forms an operating channel for the valve core assembly 4 (specifically, its valve core portion 42), with the inner wall surface of the operating channel abutting against the outer wall surface of the valve core portion 42. The second porous sleeve 9 is pressed against the port of the valve seat assembly 2 and inserted upstream of the valve seat assembly 2, forming a radial limiting connection with the valve seat assembly 2. This arrangement, on the one hand, enables the valve seat assembly 2 and the valve core assembly 4 to be aligned (i.e., their central axes coincide) using the second porous sleeve 9, ensuring a sealing effect between the valve seat assembly 2 and the valve core assembly 4; on the other hand, the second porous sleeve 9 can buffer the high-temperature and high-pressure fluid input into the input chamber 111 to a certain extent, preventing it from directly impacting the valve core assembly 4.

[0113] Furthermore, when the high-temperature, high-pressure steam medium enters the connecting flow channel 201 through the second porous sleeve 9 and the narrow channel between the valve seat assembly 2 and the valve core assembly 4, the first and most significant pressure drop occurs. At this time, the fluid velocity is extremely high, and cavitation (cavitation) and loud noise are easily generated. The labyrinth assembly 5 is located downstream of the valve seat assembly 2. This arrangement allows the fluid to first pass through the connecting flow channel 201 of the valve seat assembly 2 and then immediately enter the labyrinth assembly 5. As the fluid flows through the labyrinth assembly 5 (specifically, the labyrinth flow channel 502 formed on its labyrinth unit), it continuously changes direction and collides with each other, converting thermal energy into heat energy, thereby effectively consuming energy, significantly reducing flow velocity, noise, and vibration, and thus greatly mitigating cavitation damage to the valve body assembly 1 and downstream pipelines.

[0114] To enhance the sealing effect of the bypass discharge valve, it also includes a high-temperature and high-pressure resistant seal 7, located between the labyrinth assembly 5 and the valve seat assembly 2. Compared to ordinary elastic sealing rings (such as rubber rings), the high-temperature and high-pressure resistant seal 7 possesses high-temperature and high-pressure resistance, thus preventing seal failure between the labyrinth assembly 5 and the valve seat assembly 2 under high-temperature and high-pressure conditions, ensuring an effective seal between the two.

[0115] Specifically, the high-temperature and high-pressure resistant sealing element 7 is set as a metal C-shaped sealing ring, and the contact surface of the labyrinth assembly 5 is partially recessed to form an annular groove, with the metal C-shaped sealing ring partially located within the annular groove.

[0116] It is easy to understand that the metal C-type sealing ring is designed as an annular structure with a C-shaped cross-section. Its two ends abut against the contact surface of the labyrinth assembly 5 (i.e., the inner wall of the annular groove) and the downstream end face of the valve seat assembly 2, respectively, to achieve effective sealing between the two. Furthermore, the annular groove can radially limit the movement of the metal C-type sealing ring, preventing seal failure.

[0117] In addition, since the metal C-type sealing ring has a certain structural strength and resilience, it can better adapt to the pressure fluctuations between the labyrinth assembly 5 and the valve seat assembly 2, ensuring the sealing performance between the valve seat assembly 2 and the labyrinth assembly 5. At the same time, it avoids the labyrinth assembly 5 being directly transmitted to the valve seat assembly 2 when subjected to fluid forces, thus affecting the stability of the valve seat assembly 2.

[0118] Furthermore, the bypass discharge valve also includes a sealing ring 8, which is pressed between the valve body assembly 1 and the valve seat assembly 2. Specifically, the sealing ring 8 is configured as an elastic sealing ring (such as a rubber ring); the sealing ring 8 is located between the second step 102 of the valve body assembly 1 and the valve seat assembly 2.

[0119] It should be understood that since the labyrinth assembly 5 will vibrate under the action of fluid (such as steam), the high temperature and high pressure resistant seal 7 and sealing ring 8 in this solution can prevent the vibration of the labyrinth assembly 5 from being transmitted to the valve seat assembly 2, thereby ensuring the stability of the valve seat assembly 2.

[0120] Furthermore, the high-temperature and high-pressure resistant sealing element 7 is located radially inside the sealing ring 8, that is, the metal C-type sealing ring is located radially inside the sealing ring 8.

[0121] Furthermore, both the high-temperature and high-pressure resistant seal 7 and the sealing ring 8 are provided with one ring, and are coaxially arranged. The diameter of the high-temperature and high-pressure resistant seal 7 is smaller than the diameter of the sealing ring 8.

[0122] It is easy to understand that in other embodiments, the high-temperature and high-pressure resistant seal 7 and the sealing ring 8 can both be provided with multiple rings, ensuring that the innermost ring is the high-temperature and high-pressure resistant seal 7.

[0123] When the high-temperature and high-pressure resistant sealing element 7 is set as a metal C-type sealing ring, and the sealing ring 8 is set as an elastic sealing ring (such as a rubber ring), the two work together, and the diameter of the metal C-type sealing ring is smaller than the diameter of the elastic sealing ring (such as a rubber ring) (that is, the metal C-type sealing ring is located radially inside the elastic sealing ring (such as a rubber ring)). This enhances the sealing effect while ensuring the service life of the elastic sealing ring (such as a rubber ring). Specifically, the high-temperature and high-pressure resistant sealing element 7 located on the inner ring can achieve inner sealing and isolate the high-temperature and high-pressure environment inside the bypass discharge valve from the elastic sealing ring (such as a rubber ring), ensuring the service life of the elastic sealing ring (such as a rubber ring). At the same time, the elastic sealing ring (such as a rubber ring) located on the outer ring can further enhance the sealing effect by utilizing its own elasticity. In addition, the elastic sealing ring (such as a rubber ring) located on the outer ring can also reduce vibration of the valve seat assembly 2, thereby ensuring the stability of the valve seat assembly 2 installation.

[0124] In addition, to facilitate the installation of the labyrinth assembly 5, a lifting hole is provided on the end face of the labyrinth assembly 5 facing the valve seat assembly 2. The lifting hole is located on the radial outer side of the metal C-shaped sealing ring.

[0125] See Figure 1 , Figure 2 , Figure 9 and Figure 10 The fixing component 6 includes a pressure ring 61 and a first double-push self-locking washer 62. The pressure ring 61 is threadedly connected to the threaded hole 13 on the valve body component 1 to press the first double-push self-locking washer 62 onto the end face of the valve seat component 2. The cooperation between the pressure ring 61 and the first double-push self-locking washer 62 can ensure the stability of the valve seat component 2 during installation.

[0126] It is worth noting that since the labyrinth assembly 5 will vibrate under the action of the steam medium, the setting of the first double-shield self-locking washer 62 can effectively prevent the valve seat assembly 2 from vibrating, and thus can also effectively prevent the connection between the pressure ring 61 and the valve body assembly 1 from becoming loose.

[0127] Furthermore, the valve seat assembly 2 has a recess 21 on the side facing the fixing assembly 6; the fixing assembly 6 also includes a locking bolt 63, a locking nut 64, a second double-waisted self-locking washer 65, and a third double-waisted self-locking washer 66; the locking bolt 63 passes through the locking nut 64, the second double-waisted self-locking washer 65, the pressure ring 61, and the third double-waisted self-locking washer 66 in sequence to extend into the recess 21; the locking bolt 63 is threadedly connected to the pressure ring 61, and the locking bolt 63 presses the third double-waisted self-locking washer 66 into the recess 21; the locking bolt 63 is also threadedly connected to the locking nut 64, and the locking nut 64 presses the second double-waisted self-locking washer 65 onto the pressure ring 61.

[0128] It is easy to understand that the cooperation between the second double-waisted self-locking washer 65 and the third double-waisted self-locking washer 66 can further prevent the valve seat assembly 2 from vibrating, and thus effectively prevent the pressure ring 61 from loosening.

[0129] Furthermore, the thread direction between the locking bolt 63 and the locking nut 64, and the thread direction between the locking bolt 63 and the pressure ring 61 can be set in opposite directions to further ensure the stability of the installation between the pressure ring 61, the locking bolt 63 and the locking nut 64.

[0130] Furthermore, the locking bolt 63 extends into the recess 21 and is threadedly connected to the pressure ring 61, which can adjust the contact force between the valve seat assembly 2 and the labyrinth assembly 5, and between the valve seat assembly 2 and the valve body assembly 1, keeping it within a reasonable range. This prevents excessive contact force from causing vibration of the labyrinth assembly 5 to be easily transmitted to the valve seat assembly 2, and from causing plastic deformation of the high-temperature and high-pressure resistant seal 7 and sealing ring 8, thus affecting the sealing effect. In addition, it can also prevent insufficient contact force from causing sealing failure between the labyrinth assembly 5 and the valve seat assembly 2, and between the valve seat assembly 2 and the valve body assembly 1.

[0131] Furthermore, in order to facilitate the machining of the threaded hole 13, the valve body assembly 1 also includes a third step 103, which has a preset distance from the end of the threaded hole 13 facing the valve seat assembly 2.

[0132] See Figure 1 , Figure 2 ,as well as Figures 11 to 13 The valve core assembly 4 includes a valve stem 41, a valve core portion 42, and an actuator 43.

[0133] For ease of understanding, Figure 1 and Figure 2The upper part of the indicated orientation is designated as the "upper" of the bypass discharge valve, and the lower part of the indicated orientation is designated as the "lower" of the bypass discharge valve. The actuator 43, valve stem 41, valve core 42, 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 2 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 2 The L1 side shown is designated as the "outer side". It is easy to understand that when the actuator 43 drives the valve core 42 to move down through the valve stem 41 to block the connecting flow channel 201, the input chamber 111, the connecting flow channel 201, and the output chamber 112 are cut off, and the bypass discharge valve is closed; when the actuator 43 drives the valve core 42 to move up through the valve stem 41 to separate from the valve seat assembly 2, the connecting flow channel 201 is opened, the input chamber 111, the connecting flow channel 201, and the output chamber 112 are connected, the bypass discharge valve is opened, fluid enters from the input chamber 111, flows through the connecting flow channel 201, and is discharged from the output chamber 112.

[0134] Furthermore, the bypass discharge valve also includes a mounting bracket 44 and a connector 45. The mounting bracket 44 is detachably and fixedly mounted on the valve body assembly 1, and the connector 45 is slidably mounted on the mounting bracket 44. The actuator 43 has an output shaft 431, which is connected to the valve stem 41 via the connector 45. The connector 45 is axially limited to both the output shaft 431 and the valve stem 41. That is, the output shaft 431 and the valve stem 41 are connected via the connector 45, and the connector 45 is slidably mounted on the mounting bracket 44. In other words, the output shaft 431 drives the connector 45 to slide axially, thereby driving the valve stem 41 to move the valve core 42. This design ensures that even with a slight deviation in the central axis between the valve stem 41 and the output shaft 431, the force applied by the output shaft 431 will not be directly transmitted to the valve stem 41. Instead, it will be applied to the connector 45, which absorbs the bending moment caused by the slight deviation in the central axes of the output shaft 431 and the valve stem 41. This prevents additional bending stress from being transmitted to the valve stem 41, effectively preventing bending deformation of the valve stem 41. Simultaneously, it also prevents the valve stem 41 from being subjected to lateral forces, thereby preventing accelerated wear of the seal on the outer periphery of the valve stem 41 and effectively ensuring the reliability of the seal on the periphery of the valve stem 41.

[0135] Furthermore, there is a preset gap between the output shaft 431 and the valve stem 41. When the valve core 42 is subjected to fluid force, it will not be directly transmitted to the output shaft 431 and other structures of the actuator 43 (such as pneumatic structures, drive gears and other internal drive components) through the valve stem 41. This can prevent damage to the actuator 43 and help extend the service life of the actuator 43.

[0136] Furthermore, the mounting bracket 44 has a mounting cavity 440, and the connector 45 is located within the mounting cavity 440 and can slide within it. The connector 45 is detachably connected to the valve stem 41, meaning the connection between the valve stem 41 and the connector 45 is located within the mounting cavity 440, and the connector 45 and valve stem 41 are detachable, thus facilitating their assembly and disassembly. When the actuator 43 needs maintenance, only the valve stem 41 and the connector 45 need to be separated to perform the maintenance and disassembly of the actuator 43, without disassembling the valve stem 41. This effectively reduces the difficulty of maintenance and ensures that the sealing performance of the bypass discharge valve is not affected.

[0137] Furthermore, the valve core 42 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 421 and a main valve core 422, wherein the pilot valve core 421 and the valve stem 41 are configured as an integral structure.

[0138] It is easy to understand that since the valve stem 41 does not need to be disassembled during the disassembly and maintenance of the actuator 43, the pilot valve core 421 and the valve stem 41 are set as an integral structure in this embodiment. This not only does not affect the disassembly and maintenance of the actuator 43, but also increases the structural strength of the valve stem 41 to a certain extent, and ensures that the valve stem 41 has sufficient axial extension length.

[0139] Furthermore, the connecting piece 45 and the valve stem 41 are connected by threads. It is understood that the connection only needs to achieve axial limiting, such as a snap-fit ​​connection or a stepped surface abutment. Similarly, the connecting piece 45 and the output shaft 431 can also achieve axial limiting connection using threaded connections, stepped surface abutment fits, snap-fit ​​connections, or other methods.

[0140] Furthermore, the mounting bracket 44 includes several connecting rods 441; the several connecting rods 441 are arranged in a circular array around the central axis of the output shaft 431 to form a mounting empty area 440, that is, the central axis of the output shaft 431, the connector 45 and the valve stem 41 are closer to the central axis of the mounting bracket 44, so that the mounting bracket 44 provides better support for the output shaft 431, the valve stem 41 and the connector 45. Even if the force of the valve stem 41 is indirectly transmitted (i.e., transmitted through the connector 45 and the output shaft 431) to the mounting bracket 44, the mounting bracket 44 can be subjected to more uniform force, avoiding deformation.

[0141] Furthermore, along the direction from the actuator 43 toward the valve body assembly 1 (i.e., from top to bottom), the distance between the connecting rod 441 and the central axis of the output shaft 431 gradually increases. Specifically, the connecting rod 441 includes a first rod 4411 and a second rod 4412, which are connected from top to bottom. The first rod 4411 is equidistant from the central axis of the output shaft 431, while the distance between the second rod 4412 and the central axis of the output shaft 431 gradually increases from top to bottom. This results in a larger diameter at the end of the connecting rod 441 closer to the valve body assembly 1 (i.e., the diameter of the circle formed by the lower end of the second rod 4412), which increases its torsional resistance and ensures the structural and support stability of the connecting rod 441 itself.

[0142] Furthermore, the connecting rod 441 has a circular arc transition surface at the position where the distance changes. That is, the first rod 4411 and the second rod 4412 are connected by a circular arc segment 4413, which helps to avoid stress concentration and prevent the connecting rod 441 from breaking.

[0143] See Figure 1 , Figure 2 ,as well as Figures 11 to 13 Since the actuator 43 is fixed to the valve body assembly 1 via the mounting bracket 44, when the actuator 43 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 44. Simultaneously, it generates a torque on the mounting bracket 44 itself, attempting to "twist" or "overturn," thus affecting the stability of the mounting bracket 44 and the actuator 43. Therefore, in this embodiment, the mounting bracket 44 includes a large end 442 fixedly connected to the valve body assembly 1 and a small end 443 for mounting the actuator 43. The size of the large end 442 is smaller than the size of the small end 443; that is, the size of the end of the mounting bracket 44 connected to the valve body assembly 1 is larger than the size of the end connected to the actuator 43. This configuration allows the force and torque applied by the actuator 43 to the small end 443 to be evenly distributed over a larger area (i.e., the area where the valve body assembly 1 is connected to the large end 442) using the larger end 442. This avoids damage to the mounting bracket 44 itself due to stress concentration. At the same time, the larger end 442 increases the connection area between the large end 442 and the valve body assembly 1, avoiding stress concentration at the connection point and preventing local deformation of the valve body assembly 1.

[0144] Furthermore, the distance from the connection point of the large end 442 with the valve body assembly 1 to the central axis of the output shaft 431 is greater than the maximum distance from the outer edge of the small end 443 to the central axis of the output shaft 431. 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 44 to the valve body assembly 1 and prevent the mounting bracket 44 from loosening or shaking.

[0145] Specifically, both the large end 442 and the small end 443 are set as annular plates. The outer diameter of the large end 442 is larger than the diameter of the small end 443. One end of the connecting rod 441 (the second rod 4412) is connected to the large end 442, and the other end (the first rod 4411) is connected to the small end 443. The output shaft 431 extends through the circular hole in the middle of the small end 443 toward the valve seat assembly 2.

[0146] Specifically, the large end 442 is connected to the valve body assembly 1 by a fastening structure formed by several pairs of bolts and nuts, and the fastening structure formed by several pairs of bolts and nuts is distributed in a circular array around the central axis of the output shaft 431.

[0147] Furthermore, the central axes of the output shaft 431, valve stem 41, valve seat assembly 2, and valve core 42 are aligned to further prevent the generation of lateral forces.

[0148] Furthermore, the central axes of the large end 442 and the small end 443 can also coincide with the output shaft 431 and the valve stem 41 to increase the support effect of the mounting bracket 44.

[0149] Referring to the figure, the end of the connecting rod 441 near the actuator 43 is provided with a first reinforcing rib plate 444, and the first reinforcing rib plate 444 is slidably connected to the connecting member 45.

[0150] Specifically, the output shaft 431 of the actuator 43 is rotatably connected to the connecting member 45, which is slidably mounted on the first reinforcing rib plate 444. The power structure of the actuator 43 (such as a drive gear set) drives the output shaft 431 to rotate. The output shaft 431 converts rotation into linear motion (such as a threaded connection), thereby driving the connecting member 45 to slide along the first reinforcing rib plate 444. It is easy to understand that the first reinforcing rib plate 444 can increase the structural strength of the connecting rod 441 and also provide circumferential limiting and guiding functions for the connecting member 45. Furthermore, the rotatable connection between the connecting member 45 and the output shaft 431 can prevent the output shaft 431 from generating a large force on the connecting member 45 during rotation and transmitting it to the first reinforcing rib plate 444 and the connecting rod 441, thereby further increasing the structural stability of the connecting rod 441.

[0151] Furthermore, a second reinforcing rib 445 is provided at one end of the connecting rod 441 near the valve body assembly 1. The second reinforcing rib 445 is located on the side of the connecting rod 441 away from the mounting void 440, so as to increase the structural strength of the lower end of the connecting rod 441 (i.e., the second rod 4412).

[0152] It is easy to understand that by setting the first reinforcing rib plate 444 and the second reinforcing rib plate 445, the central axis of the connecting rod 441 plate can still be on the middle surface of the plate. Even if there is a strong force between the connecting piece 45 and the first reinforcing rib plate 444, the second reinforcing rib plate 445 can increase the structural strength of the connecting rod 441, ensure the stability of the connecting rod 441, and prevent the connecting rod 441 from bending, deforming or even breaking. Furthermore, by setting the first reinforcing rib plate 444 and the second reinforcing rib plate 445, the natural frequency of the entire mounting bracket 44 can be adjusted to prevent the bypass discharge valve from resonating.

[0153] See Figure 1 , Figure 2 ,as well as Figures 11 to 13 The sealing valve cover assembly 3 includes a valve cover pull ring 31, a self-sealing valve cover 32, and a connecting portion 33. The valve cover pull ring 31 is axially pressed by the mounting bracket 44 and radially limited on the valve body assembly 1. A portion of the self-sealing valve cover 32 is located radially inside the valve cover pull ring 31, and one end of the self-sealing valve cover 32 extends to the mounting void 440, while the other end is connected to the porous sleeve. The connecting portion 33 is located within the mounting void 440 and connects the valve cover pull ring 31 and the self-sealing valve cover 32. The end of the porous sleeve away from the self-sealing valve cover 32 abuts against the valve seat assembly 2 and forms the operating cavity of the valve core.

[0154] It is easy to understand that the self-sealing valve cover 32 extends into the mounting void 440. On the one hand, this facilitates the connection of the connecting part 33 to the valve cover pull ring 31 and the self-sealing valve cover 32 within the mounting void 440, which is beneficial for the assembly of the self-sealing valve cover 32. On the other hand, the self-sealing valve cover 32 can increase the circumferential limiting area of ​​the valve stem 41, further preventing excessive bending deformation of the valve stem 41. Furthermore, since the self-sealing valve cover 32 extends into the mounting void 440, and the valve stem 41 passes through the sealing valve cover assembly 3 and connects to the connecting part 45, the sealing area of ​​the valve stem 41 and the self-sealing valve cover 32 assembly is located within the mounting void 440, which facilitates the observation and maintenance of the sealing condition of both.

[0155] In addition, the valve cover pull ring 31 is axially pressed by the mounting bracket 44 and radially limited on the valve body assembly 1. That is, the valve cover pull ring 31, the mounting bracket 44, and the valve body assembly 1 can be mutually limited in the radial direction to ensure the installation stability of the three. At the same time, when the porous sleeve is subjected to fluid impact, its force can be weakened between the self-sealing valve cover 32, the valve cover pull ring 31, and the mounting bracket 44 (specifically the large end 442), avoiding large deformation of the valve stem 41 and further avoiding the actuator 43 being affected.

[0156] Specifically, the connecting part 33 includes a crimping ring 331 and a limiting bolt 332. The crimping ring 331 is threadedly connected to the portion of the self-sealing valve cover 32 that extends into the mounting void 440. The limiting bolt 332 passes through the crimping ring 331 and extends into a groove provided on the self-sealing valve cover 32. The limiting bolt 332 is threadedly connected to the crimping ring 331. The limiting bolt 332 and the self-sealing valve cover 32 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.

[0157] Furthermore, the valve cover pull ring 31 and the valve body assembly 1 (i.e., the inner wall surface of the opening 12) are sealed together by the first sealing part 34, and the self-sealing valve cover 32 and the valve body assembly 1 (i.e., the inner wall surface of the opening 12) are sealed together by the second sealing part 35.

[0158] Specifically, the first sealing part 34 includes a four-ring 341, a self-sealing pressure ring 342, and a self-sealing ring 343 arranged from top to bottom. The four-ring 341 is arranged around the outer periphery of the valve cover pull ring 31, while the self-sealing pressure ring 342 and the self-sealing ring 343 are arranged around the outer periphery of the self-sealing valve cover 32. The self-sealing ring 343 and the self-sealing valve cover 32 are sealed by an outwardly inclined contact surface.

[0159] Specifically, the second sealing part 35 includes a sealing cavity 351, a packing pad 352, a sealing packing 353, a spacer ring 354, a packing sleeve 355, a packing pressure plate 356, a butterfly spring 357, a butterfly spring spacer 358, and a fastener 359. The packing pad 352, the sealing packing 353, the spacer ring 354, the packing sleeve 355, and the packing pressure plate 356 are sleeved on the valve stem 41, and the packing pressure plate 356 is connected to the self-sealing valve cover 32 through the fastener 359 to press the packing pad 352, the sealing packing 353, the spacer ring 354, and the packing sleeve 355 into the sealing cavity 351. In the sealing cavity 351, the packing sleeve 355, the sealing packing 353, the spacer ring 354, the sealing packing 353, and the packing pad 352 are stacked sequentially from top to bottom, wherein the sealing packing 353 can be provided in multiple layers. Fastener 359 is configured as a bolt and nut structure, and butterfly spring 357 and butterfly spring spacer 358 are pressed between nut and packing pressure plate 356.

[0160] 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 utility model relates to a valve body assembly (1) with a fluid cavity (11) and an opening (12) communicating the fluid cavity (11) with the outside space, a valve seat assembly (2) detachably installed in the fluid cavity (11) through the opening (12), a sealing valve cover assembly (3) detachably installed on the valve body assembly (1) and sealing the opening (12), a valve core assembly (4) installed on the sealing valve cover assembly (3) and cooperating with the valve seat assembly (2) to control the conduction or interruption of the fluid cavity (11), a labyrinth assembly (5) including a first porous sleeve (51), a labyrinth part (52), a gland part (53) and a welding part (54), one end of the first porous sleeve (51) being press-fitted on the valve body assembly (1) by the valve seat assembly (2) and the other end being suspended in the fluid cavity (11), the gland part (53) being threadedly connected to the suspended end of the first porous sleeve (51) in the fluid cavity (11) to press-fit the labyrinth part (52) on the first porous sleeve (51), the welding part (54) fixedly connecting the gland part (53) and the first porous sleeve (51) and protruding from the connecting end faces of both. The welding part (54) includes a first welding boss (541) and a second welding boss (542), the first welding boss (541) protruding from the connecting end face of the gland part (53) and the second welding boss (542) protruding from the connecting end face of the first porous sleeve (51), the inner wall face of the first welding boss (541) abutting against the outer wall face of the second welding boss (542) and the first welding boss (541) being welded to the second welding boss (542) away from the first porous sleeve (51). The first porous sleeve (51) includes a ring cylinder (511) and a bottom plate (512) at the end of the ring cylinder (511) away from the valve seat assembly (2), the labyrinth part (52) includes a plurality of stacked disc assemblies (521) sleeved to the outer circumferential side of the ring cylinder (511) from one end of the bottom plate (512), the outer wall face of the bottom plate (512) is provided with a plurality of ring grooves (503) above the threaded connection area of the gland part (53) and the bottom plate (512). The side end face of the gland part (53) towards the labyrinth part (52) is provided with a limiting groove (55), each disc assembly (521) is provided with a positioning hole (56), the labyrinth assembly (5) further includes a positioning pin (57) penetrating through the oppositely arranged positioning holes (56) of all the disc assemblies (521) and inserted into the limiting groove (55), the outer wall face of the positioning pin (57) and the positioning holes (56) have a preset interval deformation gap (58). The valve body assembly (1) includes a first step (101) and a second step (102). ​ ​ ​ ​ 2. A bypass letdown valve for a high temperature gas cooled reactor according to claim 1, characterized in that ​ ​ ​ 3. A bypass letdown valve for a high temperature gas cooled reactor according to claim 1 or 2, characterized in that ​ ​ ​ 4. A bypass letdown valve for a high temperature gas cooled reactor according to claim 3, characterized in that ​ ​ ​ 5. A bypass letdown valve for a high temperature gas cooled reactor according to claim 1, characterized in that, ​ The labyrinth assembly (5) is sealingly pressed on the first step (101) by the valve seat assembly (2); The bypass exhaust valve further comprises a fixing assembly (6) connected with the valve body assembly (1) and sealingly pressing the valve seat assembly (2) on the second step (102) of the valve body assembly (1); And / or; The bypass exhaust valve further comprises a high-temperature and high-pressure resistant sealing element (7) and a sealing ring (8); The high-temperature and high-pressure resistant sealing element (7) is pressed between the labyrinth assembly (5) and the valve seat assembly (2); The sealing ring (8) is pressed between the valve body assembly (1) and the valve seat assembly (2); The high-temperature and high-pressure resistant sealing element (7) is located radially inside the sealing ring (8).

6. A bypass letdown valve for a high temperature gas cooled reactor according to claim 5, characterized in that The valve seat assembly (2) is provided with a sink (21) on the side facing the fixing assembly (6); The fixing assembly (6) comprises a pressing ring (61), a first double-pad self-locking washer (62), a locking bolt (63), a locking nut (64), a second double-pad self-locking washer (65) and a third double-pad self-locking washer (66); The pressing ring (61) is threadedly connected with the valve body assembly (1) to press the first double-pad self-locking washer (62) on the valve seat assembly (2); The locking bolt (63) penetrates the locking nut (64), the second double-pad self-locking washer (65), the pressing ring (61) and the third double-pad self-locking washer (66) in sequence and extends into the sink (21); The locking bolt (63) is threadedly connected with the pressing ring (61), and the locking bolt (63) presses the third double-pad self-locking washer (66) in the sink (21); The locking bolt (63) is further threadedly connected with the locking nut (64), and the locking nut (64) presses the second double-pad self-locking washer (65) on the pressing ring (61).

7. A bypass letdown valve for a high temperature gas cooled reactor according to claim 1, characterized in that The valve core assembly (4) comprises a valve stem (41), a valve core part (42), an actuator (43), a mounting bracket (44) and a connecting piece (45); One end of the valve stem (41) is connected with the valve core part (42), and the other end extends out of the fluid cavity (11) and is connected with the actuator (43); The actuator (43) is mounted on the mounting bracket (44); The actuator (43) comprises an output shaft (431), and the output shaft (431) is connected with the valve stem (41) through the connecting piece (45); The connecting piece (45) is slidingly mounted on the mounting bracket (44); The connecting piece (45) is axially limitedly connected with the output shaft (431) and the valve stem (41), and the output shaft (431) and the valve stem (41) have a preset interval.

8. A bypass letdown valve for a high temperature gas cooled reactor according to claim 7, characterized in that The mounting bracket (44) is provided with a mounting empty area (440); The connecting piece (45) is located in the mounting empty area (440) and can slide in the mounting empty area (440); The connecting piece (45) is detachably connected with the valve stem (41).

9. A bypass letdown valve for a high temperature gas cooled reactor according to claim 8, characterized in that The mounting bracket (44) comprises a plurality of connecting rods (441); The plurality of connecting rods (441) are arranged in a circular array around the central axis of the output shaft (431) to form the mounting space (440); The distance between the connecting rods (441) and the central axis of the output shaft (431) gradually increases in the direction from the actuator (43) to the valve body assembly (1); The distance between the connecting rods (441) and the central axis of the output shaft (431) gradually increases in the direction from the actuator (43) to the valve body assembly (1); 10. A bypass letdown valve for a high temperature gas cooled reactor according to claim 7, characterized in that, The distance between the connecting rods (441) and the central axis of the output shaft (431) gradually increases in the direction from the actuator (43) to the valve body assembly (1); The distance between the connecting rods (441) and the central axis of the output shaft (431) gradually increases in the direction from the actuator (43) to the valve body assembly (1); The mounting bracket (44) is detachably connected with the valve body assembly (1) and presses the sealing valve cover assembly (3) to the valve body assembly (1); The valve stem (41) penetrates through the sealing valve cover assembly (3) and is sealingly connected with the sealing valve cover assembly (3).

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