Labyrinth assembly and high temperature gas cooled reactor bypass valve

Abstract

The present application relates to a kind of labyrinth assembly and high temperature gas cooled reactor bypass valve, the labyrinth assembly includes: porous sleeve, lower end is suspended in the output cavity, upper end has the first abutting surface towards the output cavity;Labyrinth portion, from the lower end of the porous sleeve is sleeved to the outer circumferential side of the porous sleeve, the labyrinth portion includes several groups of stacked disk assembly;Covering portion, thread connection in the lower end of the porous sleeve, to press the labyrinth portion on the first abutting surface;Welding portion includes first welding boss and second welding boss;The first welding boss is protrudingly arranged in the lower end of the covering portion, and the second welding boss is protrudingly arranged in the lower end of the porous sleeve;The inner wall surface of the first welding boss and the outer wall surface of the second welding boss abut, and the lower end of the first welding boss and the lower end of the second welding boss are welded, with the advantages of guaranteeing the effectiveness of labyrinth portion and the stability of valve, while facilitating the disassembly of labyrinth portion.

Description

Technical Field

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

[0002] High-temperature gas-cooled reactor bypass valves are used to cope with extreme high pressure differential conditions 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 labyrinth pressure reducing valve control affect the safety and efficiency of the entire system.

[0003] Existing high-temperature gas-cooled reactor bypass valves include valve bodies, valve seats, valve cores, and labyrinth assemblies. 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 pressure and energy, thereby achieving smooth pressure reduction. For example, the patent with publication number CN204628787U discloses stackable noise-reducing discs, an exhaust diffuser, and a control valve. Specifically, the use of the control valve 54 requires stacking multiple discs 10 to form an exhaust diffuser 100 or a valve cage 52. Each disc 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. The tube 102, the multiple discs 10, and the end plate 106 can be coupled by multiple through bolts 108 extending through each set of axially aligned holes, including holes extending through the neck flange 104 of the disc 10, holes 32, and holes extending axially aligned through the end wall 106.

[0004] However, the pressure of the steam medium in the labyrinth assembly varies greatly, which will generate frequent vibrations and dynamic loads. When the discs of the labyrinth assembly are fixed with bolts, the bolt fixing may vibrate during the vibration process, affecting the vibration resistance of the entire labyrinth assembly, and thus affecting the performance of the entire 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 labyrinth assembly and a bypass valve for a high-temperature gas-cooled reactor.

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

[0007] A labyrinth assembly is mounted on the valve body of a bypass valve for a high-temperature gas-cooled reactor, the valve body having an output chamber; the labyrinth assembly includes:

[0008] A porous sleeve, with its lower end suspended inside the output cavity, and its upper end having a first abutting surface facing the output cavity;

[0009] The labyrinth section extends from the lower end of the porous sleeve to the outer periphery of the porous sleeve, and the labyrinth section includes several sets of stacked disk assemblies.

[0010] The pressure cap is threaded to the lower end of the porous sleeve to press the labyrinth portion onto the first contact surface;

[0011] The welded part includes a first welding boss and a second welding boss;

[0012] The first welding boss protrudes from the lower end of the pressure cap, and the second welding boss protrudes from the lower end of the porous sleeve;

[0013] The inner wall surface of the first welding boss abuts against the outer wall surface of the second welding boss, and the lower end of the first welding boss is welded to the lower end of the second welding boss.

[0014] Preferably, the labyrinth section further includes labyrinth channels formed by stacking the disk assemblies;

[0015] The porous sleeve includes an annular cylinder and a base plate. The annular cylinder is provided with several communicating holes that communicate with the labyrinth flow channel. The base plate is located at the lower end of the annular cylinder and is threadedly connected to the pressure cap.

[0016] The outer wall surface of the porous sleeve is provided with several annular grooves distributed along its axial direction, and the annular grooves are located above the threaded connection area between the pressure cap and the base plate.

[0017] Preferably, the inner wall surface of the annular groove is an arc surface;

[0018] And / or,

[0019] There are two annular grooves.

[0020] Preferably, the base plate includes a first part and a second part;

[0021] The first part is connected between the second part and the annular cylinder;

[0022] The diameter of the first part is larger than that of the second part, so as to form a step between the two;

[0023] The annular groove is formed on the outer wall surface of the first part;

[0024] The outer wall surface of the second part is formed with an external thread that is threadedly connected to the gland part.

[0025] Preferably, it also includes a straight-through pipe;

[0026] The straight pipe passes through the base plate to directly connect the inside and outside of the porous sleeve.

[0027] Preferably, the disk assembly includes an inner disk, an outer disk, and a spacer disk;

[0028] Both the inner and outer discs are provided with several through holes, and the outer disc is also provided with several openings that communicate with the interior of the porous sleeve.

[0029] The outer disks are stacked on both sides of the inner disk, and the spacer disks are stacked on the side of the outer disks away from the inner disks;

[0030] When the inner disk, the outer disk, and the spacer disk are stacked, the through hole and the opening form a labyrinth flow channel.

[0031] Preferably, the labyrinth section further includes a top ring and a bottom ring.

[0032] The disk top ring is located between the uppermost disk assembly and the first contact surface;

[0033] The bottom ring of the disk is located between the bottommost disk assembly and the pressure cap.

[0034] Preferably, the end face of the pressure cap facing the labyrinth section has a limiting groove;

[0035] The inner disk, the outer disk, and the spacer disk are all provided with a plurality of positioning holes;

[0036] The maze assembly also includes a positioning pin that passes through positioning holes on the inner disc, the outer disc, and the spacer disc, and is inserted into the limiting groove.

[0037] There is a deformation gap between the outer wall surface of the positioning pin and the wall surface of the positioning hole.

[0038] A high-temperature gas-cooled reactor bypass valve has a labyrinth assembly as described above, as well as a valve body and a valve seat.

[0039] The labyrinth assembly is pressed onto the valve body by the valve seat.

[0040] Preferably, the porous sleeve of the labyrinth assembly has an annular sealing groove on one end face facing the valve seat, and a C-type metal seal is installed in the annular sealing groove;

[0041] The porous sleeve is also provided with a lifting hole on one end face facing the valve seat, and the lifting hole is located on the outer side of the annular sealing groove.

[0042] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0043] This invention provides a labyrinth assembly and a bypass valve for a high-temperature gas-cooled reactor. By suspending the lower end of a porous sleeve and installing the labyrinth section onto the outer periphery of the porous sleeve, the labyrinth section and a portion of the 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 for a certain degree of axial expansion and contraction of the labyrinth section, effectively absorbing displacement caused by thermal expansion, reducing internal stress, and improving the thermal stability of the labyrinth section, the porous sleeve, and the valve seat. Furthermore, the slight floating of the labyrinth assembly can absorb some vibration energy, reducing the risk of fatigue damage to the labyrinth section.

[0044] Furthermore, the labyrinth section is pressed onto the first contact surface by a threaded connection between the pressure cap and the multi-hole sleeve. In other words, the threaded connection allows for pre-fixing and adjustment of the labyrinth section. This enables the adjustment of the contact force between the disc assemblies and the gap between the discs during the labyrinth assembly process, ensuring that the labyrinth flow channel formed between the disc assemblies maintains the design accuracy and that the fluid dynamics performance remains stable.

[0045] Meanwhile, by welding the porous sleeve and the gland part together, the porous sleeve and the gland part are integrated into a single structure. This can prevent relative shaking between the gland part and the porous sleeve when the labyrinth assembly is subjected to frequent vibration and dynamic loads, thereby ensuring the stability of the threaded connection between the gland part and the porous sleeve, and thus ensuring the stability of the labyrinth part crimping, and ensuring the vibration resistance of the entire labyrinth assembly.

[0046] Furthermore, by setting the first welding boss and the second welding boss of the welding part, with the first welding boss protruding from the lower end of the cover part and the second welding boss protruding from the lower end of the porous sleeve, and welding the lower ends of the first welding boss and the second welding boss, the welding part can be ground off when the disk assembly needs to be inspected and studied. At this time, the disk assembly can be disassembled after the cover part is unscrewed from the porous sleeve, which facilitates the disassembly of the disk assembly. Attached Figure Description

[0047] 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.

[0048] Figure 1 This is a structural schematic diagram (section) of one example of the maze component provided in this embodiment.

[0049] Figure 2 for Figure 1An enlarged view of position D1 in the middle.

[0050] Figure 3 for Figure 1 An enlarged view of position D2 in the middle.

[0051] Figure 4 This is an exploded view of the disk assembly.

[0052] Figure 5 This is a schematic diagram showing the positions of the disk assembly and the locating pins.

[0053] Figure 6 for Figure 5 Enlarged diagram of position D3 in the middle.

[0054] Figure 7 A cross-sectional view of one example of the high-temperature gas-cooled reactor bypass valve provided in this embodiment.

[0055] Explanation of reference numerals in the attached figures:

[0056] 100. Valve body; 101. Output chamber; 200. Valve seat; 1. Multi-hole sleeve; 10. First abutment surface; 11. Ring cylinder; 111. Connecting hole; 12. Base plate; 121. First part; 122. Second part; 13. Annular sealing groove; 14. C-type metal seal; 15. Lifting hole; 2. Labyrinth part; 21. Disc assembly; 211. Inner disc; 212. Outer disc; 213. Spacer disc; 214. Through hole; 215. Opening; 22. Labyrinth flow channel; 23. Disc top ring; 24. Disc bottom ring; 3. Pressure cap part; 4. Welding part; 41. First welding boss; 42. Second welding boss; 5. Annular groove; 6. Straight pipe; 7. Limiting groove; 8. Positioning hole; 9. Positioning pin; 90. Deformation gap. Detailed Implementation

[0057] 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.

[0058] 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.

[0059] 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.

[0060] Example 1

[0061] See Figures 1 to 6 This invention provides a labyrinth assembly installed on the valve body 100 of a high-temperature gas-cooled reactor bypass valve, the valve body 100 having an output chamber 101.

[0062] Specifically, the labyrinth assembly includes a porous sleeve 1, a labyrinth section 2, a pressure cap section 3, and a welding section 4. The lower end of the porous sleeve 1 is suspended within the output cavity 101, and the upper end has a first abutment surface 10 facing the output cavity 101. The labyrinth section 2 is fitted from the lower end of the porous sleeve 1 to its outer periphery, and includes several stacked disc assemblies 21. The pressure cap section 3 is threaded to the lower end of the porous sleeve 1 to press the labyrinth section 2 onto the first abutment surface 10. The welding section 4 is used to securely connect the pressure cap section 3 and the lower end of the porous sleeve 1.

[0063] It is easy to understand that by suspending the lower end of the porous sleeve 1 and installing the labyrinth section 2 on the outer periphery of the porous sleeve 1, that is, the labyrinth section 2 and the porous sleeve 1 are partially suspended relative to the valve body 100. Compared to axially limiting both ends of the labyrinth assembly to the valve body 100, this arrangement allows the labyrinth section 2 to have a certain degree of free expansion and contraction space in the axial direction, thereby effectively absorbing the displacement caused by thermal expansion, reducing internal stress, and improving the thermal stability of the labyrinth section 2, the porous sleeve 1, and the valve seat 200. Furthermore, it can also absorb some vibration energy by utilizing the slight floating of the labyrinth assembly, reducing the risk of damage to the labyrinth section 2 due to fatigue. Furthermore, the labyrinth section 2 is pressed onto the first contact surface 10 by a threaded connection between the pressure cap 3 and the porous sleeve 1. This threaded connection allows for pre-fixation and adjustment of the labyrinth section 2, enabling adjustment of the contact force between the disc assemblies 21 and the gap between the discs during labyrinth assembly assembly. This ensures the labyrinth flow channel 22 formed between the disc assemblies 21 maintains design accuracy and guarantees stable fluid dynamic performance. Simultaneously, the porous sleeve 1 and the pressure cap 3 are welded together by the welding part 4, forming an integral structure. This prevents relative wobbling between the pressure cap 3 and the porous sleeve 1 during frequent vibrations and dynamic loads, ensuring the stability of the threaded connection between the pressure cap 3 and the porous sleeve 1, thus guaranteeing the stability of the labyrinth section 2 pressing and the overall vibration resistance of the labyrinth assembly.

[0064] While welding the porous sleeve 1 and the capping part 3 with the welding part 4 can increase the stability of the connection between the two, it can also make it difficult to disassemble the disk assembly 21. Therefore, in this embodiment, the welding part 4 includes a first welding boss 41 and a second welding boss 42. The first welding boss 41 protrudes from the lower end of the capping part 3, and the second welding boss 42 protrudes from the lower end of the porous sleeve 1. The inner wall surface of the first welding boss 41 abuts against the outer wall surface of the second welding boss 42, and the lower end of the first welding boss 41 is welded to the lower end of the second welding boss 42. This allows the welding part 4 to be ground off when the disk assembly 21 needs to be inspected and studied. At this time, the capping part 3 can be unscrewed from the porous sleeve 1, and the disk assembly 21 can be disassembled, which facilitates the disassembly of the disk assembly 21.

[0065] It is worth noting that "the inner wall surface of the first welding boss 41 abuts against the outer wall surface of the second welding boss 42" can be the entire outer wall surface abutting or only a part of the outer wall surface abutting, as long as it can ensure that the cover part 3 and the porous sleeve 1 can be disassembled after the welding part 4 is ground off.

[0066] Specifically, in this embodiment, the lower ends of the first welding boss 41 and the second welding boss 42 are formed with solder filling areas (i.e., the first welding boss 41 and the second welding boss 42 are both provided with inclined surfaces, and the inclined surfaces form solder filling areas) to increase the welding stability of the first welding boss 41 and the second welding boss 42.

[0067] Furthermore, the first welding boss 41 and the second welding boss 42 are arranged in a ring to increase the connection area and ensure the stability and sealing of the connection.

[0068] Furthermore, the first welding boss 41 is integrally formed with the pressure cap 3, and the second welding boss 42 is integrally formed with the porous sleeve 1, thereby increasing the stability of the connection between the pressure cap 3 and the porous sleeve 1. Of course, in other embodiments, the first welding boss 41 can be welded to the pressure cap 3, and the second welding boss 42 can be welded to the porous sleeve 1, so that after the welding part 4 is ground off, the first welding boss 41 and the second welding boss 42 can be re-welded to the pressure cap 3 and the porous sleeve 1 respectively, facilitating secondary assembly.

[0069] See Figures 1 to 4 The labyrinth section 2 also includes a labyrinth flow channel 22 formed by stacking disc assemblies 21. The porous sleeve 1 includes an annular cylinder 11 and a base plate 12. The annular cylinder 11 is provided with a plurality of connecting holes 111 that communicate with the labyrinth flow channel 22. The base plate 12 is located at the lower end of the annular cylinder 11 and is threadedly connected to the pressure cap section 3.

[0070] When the labyrinth assembly is applied to the high-temperature gas-cooled reactor bypass valve, and the high-temperature gas-cooled reactor bypass valve is opened, the inside of the porous sleeve 1 is connected to the input end of the high-temperature gas-cooled reactor bypass valve. The steam medium (high temperature and high pressure) flows from the inside of the porous sleeve 1 (that is, the inside of the area enclosed by the annulus 11 and the bottom plate 12) through the connecting hole 111 to the labyrinth flow channel 22, and then is discharged to the outside of the labyrinth assembly and output from the output end of the high-temperature gas-cooled reactor bypass valve.

[0071] Due to the influence of high-temperature steam medium, the porous sleeve 1 is prone to thermal stress. The annular sleeve 11 is provided with a connecting hole 111, which weakens the strength of the annular sleeve 11 to a certain extent, allowing it to undergo slight deformation or bending, thereby releasing thermal stress and avoiding stress concentration.

[0072] However, in order to ensure a stable connection between the porous sleeve 1 and the pressure cap 3, and to enable the cover plate to apply sufficient compressive force to the labyrinth section 2, the base plate 12 is usually a relatively thick plate-shaped structure (circular plate). This causes the stress on the base plate 12 to tend to concentrate at constraint points and geometric abrupt changes (such as joints, corners, etc.) when it expands due to heat, that is, at the connection position between the base plate 12 and the ring cylinder 11, and at the threaded connection position between the base plate 12 and the pressure cap 3. This can lead to instability in the connection between the pressure cap 3 and the base plate 12, affecting the stability of the connection between the ring cylinder 11 and the base plate 12. Therefore, in this embodiment, the outer wall surface of the porous sleeve 1 is provided with several annular grooves 5 distributed along its axial direction, and the annular grooves 5 are located above the threaded connection area between the pressure cap 3 and the base plate 12. By setting the annular grooves 5, the stress transmission path of the base plate 12 can be changed, and the stress can be redistributed on both sides of the annular grooves 5, avoiding the formation of excessively high stress peaks in a certain local area, and ensuring the stability of the connection between the ring cylinder 11 and the base plate 12, and between the pressure cap 3 and the base plate 12. Furthermore, the annular groove 5 ensures that even if a small crack occurs at the end of the base plate 12 closest to the steam medium, the annular groove 5 can still act as a "crack stopper". Because the root of the annular groove 5 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 cover part 3 and the base plate 12, ensuring the stability of the connection between the two, and further ensuring the stability of the installation of the labyrinth part 2.

[0073] Specifically, the inner wall of the annular groove 5 is an arc surface. The arc transition design of the annular groove 5 helps to smooth the stress gradient and reduce the stress concentration factor.

[0074] Furthermore, along the axial direction of the porous sleeve 1, there are two annular grooves 5.

[0075] Furthermore, the base plate 12 includes a first part 121 and a second part 122; wherein, the first part 121 is connected between the second part 122 and the ring cylinder 11; the diameter of the first part 121 is larger than that of the second part 122 to form a step between the two; an annular groove 5 is formed on the outer wall surface of the first part 121; and an external thread is formed on the outer wall surface of the second part 122 to be threadedly connected to the pressure cap 3.

[0076] It is easy to understand that the formation of the step can facilitate the processing of the external thread on the one hand, and on the other hand, it can also prevent the slight deformation of the first part 121 from affecting the stability of the connection between the gland part 3 and the second part 122.

[0077] Furthermore, the outer walls of the first part 121, the second part 122, and the steps can be connected by arcs to avoid stress concentration.

[0078] See Figures 1 to 4The disk assembly 21 includes an inner disk 211, an outer disk 212, and spacer disks 213. Both the inner disk 211 and the outer disk 212 have several through holes 214, and the outer disk 212 also has several openings 215 communicating with the interior of the porous sleeve 1. The outer disks 212 are stacked on both sides of the inner disk 211, and the spacer disks 213 are stacked on the side of the outer disks 212 away from the inner disks 211. When the inner disks 211, outer disks 212, and spacer disks 213 are stacked, the through holes 214 and openings 215 form a labyrinthine flow channel 22.

[0079] Understandably, the inner disc 211 has a through hole 214, and the outer disc 212 has an opening 215 and a through hole 214, which would reduce the structural strength of the inner and outer discs 211 and 212. The spacer disc 213, however, ensures that when the inner disc 211, outer disc 212, and spacer disc 213 are stacked and compressed, the inner disc 211 and outer disc 212 experience more even stress, preventing deformation of the inner and outer discs 211 and 212.

[0080] Furthermore, the labyrinth section 2 also includes a disk top ring 23 and a disk bottom ring 24; the disk top ring 23 is located between the uppermost disk assembly 21 and the first contact surface 10; the disk bottom ring 24 is located between the lowermost disk assembly 21 and the pressure cap 3. The hardness of the disk top ring 23 can be set between the hardness of the disk assembly 21 and the hardness of the porous sleeve 1 (the part with the first contact surface 10), and the hardness of the disk bottom ring 24 can be set between the hardness of the pressure cap 3 and the hardness of the disk assembly 21, so that the disk top ring 23 and the disk bottom ring 24 can serve as a transition buffer structure, which can ensure the stable installation of the disk assembly 21 and prevent the disk assembly 21 from being squeezed and deformed.

[0081] See Figure 1 and Figure 3 The labyrinth assembly also includes a straight-through pipe 6. Specifically, the straight-through pipe 6 penetrates the base plate 12 to directly connect the inside and outside of the porous sleeve 1, allowing most of the steam medium to be output from the inside of the porous sleeve 1 (i.e., the inside of the valve) to the outside of the porous sleeve 1 (i.e., the outside of the valve) through the labyrinth section 2, while a small portion of the steam medium can be output from the inside of the porous sleeve 1 (i.e., the inside of the valve) to the outside of the porous sleeve 1 (i.e., the outside of the valve) through the straight-through pipe 6. This helps to disperse the flow pressure of the steam medium, reduce the vibration and noise of the labyrinth assembly, and ensure the effective discharge of the steam medium, thus guaranteeing the sealing performance of the valve system equipped with this labyrinth assembly.

[0082] See Figures 1 to 6The inner disc 211, outer disc 212, and spacer disc 213 are each provided with several positioning holes 8. The positioning holes 8 can be arranged in a circular array along the central axis of the valve. The labyrinth assembly also includes positioning pins 9, which pass through the positioning holes 8 on the inner disc 211, outer disc 212, and spacer disc 213, and are inserted into the limiting groove 7, thereby enabling the positioning and installation of the inner disc 211, outer disc 212, and spacer disc 213.

[0083] Furthermore, a deformation gap 90 is provided between the outer wall of the locating pin 9 and the wall of the locating hole 8. Specifically, the deformation gap 90 can be set according to the amount of material expansion within the corresponding steam medium temperature range, for example, it can be set to 0.1 mm, 0.2 mm, 0.5 mm or 1 mm.

[0084] It is easy to understand that the deformation gap 90 can prevent stress concentration between the positioning pin 9 and the disk assembly 21 due to thermal expansion under high temperature conditions, which could lead to deformation or breakage of the disk assembly 21 and the positioning pin 9, thus ensuring the effectiveness of the labyrinth section 2. Furthermore, since the deformation gap 90 allows for a small relative rotation angle of the disk assembly 21, it does not affect the design accuracy of the labyrinth flow channel 22 formed after the disk assembly 21 is assembled, ensuring stable fluid dynamic performance.

[0085] Example 2

[0086] See Figure 1 and Figure 7 This embodiment also provides a high-temperature gas-cooled reactor bypass valve, which has a labyrinth assembly as described in Embodiment 1 above (the connecting hole 111 on the labyrinth assembly is not shown in the drawings), as well as a valve body 100 and a valve seat 200.

[0087] Specifically, the labyrinth assembly is pressed onto the valve body 100 by the valve seat 200, which facilitates the overall disassembly of the labyrinth assembly. At the same time, it can prevent the vibration of the labyrinth assembly from being directly transmitted to the valve body 100, ensuring the stability of the valve seat 200 installation.

[0088] Furthermore, the valve seat 200 can also be detachably installed on the valve body 100.

[0089] Furthermore, the porous sleeve 1 of the labyrinth assembly has an annular sealing groove 13 on the end face facing the valve seat 200. A C-type metal seal 14 is installed in the annular sealing groove 13. The C-type metal seal 14 can not only ensure the sealing performance between the valve seat 200 and the labyrinth assembly, but also play a certain role in vibration reduction. The C-type metal seal 14 is installed in the annular sealing groove 13, which can prevent the C-type metal seal 14 from radially moving.

[0090] Furthermore, the perforated sleeve 1 is provided with a lifting hole 15 on the end face facing the valve seat 200. The lifting hole 15 is located on the outer side of the annular sealing groove 13 to facilitate the installation of the perforated sleeve 1.

[0091] 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 labyrinth assembly mounted on the valve body (100) of a high-temperature gas-cooled reactor bypass valve, said valve body (100) having an output chamber (101); characterized in that, The maze components include: The porous sleeve (1) is suspended at its lower end inside the output cavity (101) and has a first contact surface (10) facing the output cavity (101) at its upper end. The labyrinth section (2) extends from the lower end of the porous sleeve (1) to the outer periphery of the porous sleeve (1). The labyrinth section (2) includes several stacked disk assemblies (21). The pressure cap (3) is threaded to the lower end of the porous sleeve (1) to press the labyrinth part (2) onto the first contact surface (10); The welding part (4) includes a first welding boss (41) and a second welding boss (42); The first welding boss (41) protrudes from the lower end of the pressure cap (3), and the second welding boss (42) protrudes from the lower end of the porous sleeve (1). The inner wall surface of the first welding boss (41) abuts against the outer wall surface of the second welding boss (42), and the lower end of the first welding boss (41) is welded to the lower end of the second welding boss (42).

2. A maze component according to claim 1, characterized in that, The labyrinth section (2) also includes a labyrinth channel (22) formed by stacking the disk assembly (21). The porous sleeve (1) includes an annular cylinder (11) and a base plate (12). The annular cylinder (11) is provided with several connecting holes (111) that communicate with the labyrinth flow channel (22). The base plate (12) is located at the lower end of the annular cylinder (11) and is threadedly connected to the pressure cap (3). The outer wall surface of the porous sleeve (1) is provided with several annular grooves (5) distributed along its axial direction, and the annular grooves (5) are located above the threaded connection area between the pressure cap (3) and the base plate (12).

3. A maze component according to claim 2, characterized in that, The inner wall surface of the annular groove (5) is an arc surface; And / or, There are two annular grooves (5).

4. A maze component according to claim 2, characterized in that, The base plate (12) includes a first part (121) and a second part (122); The first part (121) is connected between the second part (122) and the annular cylinder (11); The diameter of the first part (121) is larger than that of the second part (122) to form a step between the two; The annular groove (5) is formed on the outer wall surface of the first part (121); The outer wall surface of the second part (122) is formed with an external thread that is threadedly connected to the pressure cap part (3).

5. A maze component according to claim 2, characterized in that, It also includes straight-through pipes (6); The straight pipe (6) passes through the base plate (12) to directly connect the inside and outside of the porous sleeve (1).

6. A maze component according to any one of claims 1-5, characterized in that, The disk assembly (21) includes an inner disk (211), an outer disk (212), and a spacer disk (213). Both the inner disc (211) and the outer disc (212) are provided with a plurality of through holes (214), and the outer disc (212) is also provided with a plurality of openings (215) that communicate with the interior of the porous sleeve (1). The outer disks (212) are stacked on both sides of the inner disk (211), and the spacer disks (213) are stacked on the side of the outer disks (212) away from the inner disks (211); When the inner disk (211), the outer disk (212), and the spacer disk (213) are stacked, the through hole and the opening form a labyrinth flow channel (22).

7. A maze component according to claim 6, characterized in that, The labyrinth section (2) also includes a disk top ring (23) and a disk bottom ring (24). The disk top ring (23) is located between the uppermost disk assembly (21) and the first abutment surface (10); The disk bottom ring (24) is located between the bottom disk assembly (21) and the cover portion (3).

8. A maze component according to claim 6, characterized in that, The end face of the pressure cap (3) facing the labyrinth part (2) has a positioning groove (7). The inner disk (211), the outer disk (212) and the spacer disk (213) are each provided with a plurality of positioning holes (8). The maze assembly also includes a positioning pin (9), which passes through the positioning holes (8) on the inner disc (211), the outer disc (212) and the spacer disc (213) and is inserted into the limiting groove (7); There is a deformation gap (90) between the outer wall surface of the positioning pin (9) and the wall surface of the positioning hole (8).

9. A bypass valve for a high-temperature gas-cooled reactor, characterized in that, It has a labyrinth assembly as described in any one of claims 1-8, and a valve body (100) and a valve seat (200). The labyrinth assembly is pressed onto the valve body (100) by the valve seat (200).

10. A high-temperature gas-cooled reactor bypass valve according to claim 9, characterized in that, The porous sleeve (1) of the labyrinth assembly has an annular sealing groove (13) on one end face facing the valve seat (200), and a C-type metal seal (14) is installed in the annular sealing groove (13). The porous sleeve (1) is also provided with a lifting hole (15) on one end face facing the valve seat (200), and the lifting hole (15) is located on the outer side of the annular sealing groove (13).

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