Elastic supporting device, steam generator assembly and nuclear reactor system

Abstract

The invention discloses an elastic supporting device, a steam generator assembly and a nuclear reactor system, an elastic piece is arranged between a sealing pipe nozzle and a base plate, expansion difference generated by a steam generator from a cold state to a hot state is compensated, and the bottom of the device is in close contact with a shunting assembly under the action of external force such as vibration and seismic load by means of elastic force; and the steam generator is always in close contact with the shunting assembly. According to the main technical scheme, the elastic supporting device is used for the steam generator, a first through hole is formed in a base plate, the base plate is connected with an outlet connecting pipe, the outlet connecting pipe is communicated with the first through hole, and a reactor coolant flows out from the first through hole; the lower section of the outlet connecting pipe is inserted into an annular cavity of a sealing pipe nozzle below the outlet connecting pipe; a second through hole is formed in the other side, opposite to the outlet connecting pipe, of the sealing pipe nozzle; the elastic piece is arranged between the sealing pipe nozzle and the base plate and used for applying elastic force away from each other to the sealing pipe nozzle and the base plate. The support is mainly used for supporting.

Description

Technical Field

[0001] This invention relates to the field of nuclear reactor technology, and in particular to a flexible support device, a steam generator assembly, and a nuclear reactor system. Background Technology

[0002] For integrated reactors, a steam generator is used, positioned above the reactor core in the annular space between the pressure vessel and the hopper. Its upper part is welded to the pressure vessel, and its bottom rests on the flow distribution assembly. The connection and support method between the steam generator and the pressure vessel and flow distribution assembly have a significant impact on the safe operation of the reactor.

[0003] Traditional rigid connections and supports can prevent reactor coolant leakage and ensure core safety, but they generate significant thermal stress, which is detrimental to the long-term safe operation of the steam generator. Therefore, it is necessary to adopt new connection and support methods for the steam generator, pressure vessel, and flow distribution assembly, while ensuring core safety, to eliminate or reduce thermal stress and guarantee the long-term safe operation of the steam generator. Current technology lacks seismic-resistant, low-leakage connection methods suitable for eliminating thermal stress in steam generators. Summary of the Invention

[0004] In view of this, in order to solve at least one of the above-mentioned technical problems, the present invention provides an elastic support device, a steam generator assembly, and a nuclear reactor system.

[0005] To achieve the above objectives, the present invention mainly provides the following technical solutions: On one hand, the present invention provides an elastic support device for a steam generator, the elastic support device comprising: Substrate, outlet pipe, elastic element, and sealing nozzle; A first through hole is provided on the substrate, the substrate is connected to the outlet pipe, and the outlet pipe is connected to the first through hole. The outlet pipe is used to flow reactor coolant. The sealing nozzle includes a tube body and an extension plate. The tube body has an annular cavity, and the extension plate is disposed on the outer periphery of the tube body. A second through hole is provided on the other side of the annular cavity opposite to the outlet pipe. The end of the outlet pipe away from the substrate is inserted into the annular cavity of the sealing nozzle. An elastic element is disposed between the sealing nozzle and the substrate, and the elastic element is used to apply an elastic force that moves the sealing nozzle and the substrate away from each other.

[0006] The elastic support device also includes: At least one sealing ring is located between the outlet nozzle and the inner wall of the ring cavity, and the sealing ring slides in fit with the inner wall of the ring cavity.

[0007] The outer wall of the outlet pipe is provided with an embedding groove, and the sealing ring is embedded in the embedding groove to seal the annular cavity.

[0008] Among them, the elastic element is a spring, and the elastic support device also includes a spring positioning column; The upper end of the spring positioning post is connected to the base plate and is movably connected to the extension plate, with the spring sleeved on the spring positioning post.

[0009] The elastic support device also includes: The adjusting nut and the spring positioning post include external threads. The adjusting nut is threadedly connected to the spring positioning post from one side of the extended plate opposite to the base plate.

[0010] The elastic support device also includes: A spring sleeve is connected to a base plate and surrounds the outer periphery of the spring portion structure.

[0011] The number of elastic elements is multiple, and these multiple elastic elements are evenly distributed around the circumference of the outlet pipe.

[0012] The sealing nozzle includes a tube body and an extension plate. The tube body has an annular cavity, and the extension plate is located on the outer periphery of the tube body and extends outward. The extension plate is provided with a force-applying lug, which protrudes from the edge of the extension plate.

[0013] On the other hand, the present invention also provides a steam generator assembly, including a resilient support device as described in any of the above, and A steam generator, wherein the base plate of the steam generator is connected to the base plate, or the base plate of the steam generator is integrally formed with the base plate.

[0014] Furthermore, the present invention also provides a nuclear reactor system, including the aforementioned steam generator assembly, and Pressure vessels, flow distribution assemblies, and suspended platforms; The basket is used to connect the reactor core and is located inside the pressure vessel. The steam generator assembly is located between the basket and the pressure vessel and above the flow divider assembly. The sealing nozzle abuts against the flow divider assembly, and the second through hole communicates with the flow divider assembly.

[0015] The present invention proposes an elastic support device, a steam generator assembly, and a nuclear reactor system. By setting an elastic element between the sealing nozzle and the base plate, the expansion difference generated by the steam generator from a cold state to a hot state is compensated. At the same time, the elastic force provided by the elastic element ensures that the bottom of the elastic support device remains in close contact with the flow distribution assembly under the action of external forces such as vibration and seismic loads. This ensures that the steam generator and the flow distribution assembly are always in close contact, effectively reducing the risk of reactor coolant leakage at the contact surface and ensuring the long-term safe operation of the reactor. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural schematic diagram of an elastic support device provided in an embodiment of the present invention; Figure 2 This is a bottom view of an elastic support device provided in an embodiment of the present invention; Figure 3 This is a cross-sectional schematic diagram of a partial structure of a nuclear reactor system provided in an embodiment of the present invention. Detailed Implementation

[0017] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and 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 limiting the present invention.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0019] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 according to the specific circumstances.

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0021] like Figure 1-2 As shown, an embodiment of the present invention provides an elastic support device for a steam generator 12. The elastic support device includes: 1. Substrate; 2. Outlet pipe; 5. Elastic element; 7. Sealing nozzle; A first through hole 101 is provided on the substrate 1. The substrate 1 is connected to the outlet pipe 2, and the outlet pipe 2 is connected to the first through hole 101. The outlet pipe 2 is used to flow reactor coolant. The lower section of the outlet pipe is inserted into the annular cavity 701 of the sealing nozzle 7 below it, and the sealing nozzle has a second through hole 702 on the other side of the outlet pipe 7. The elastic element 5 is disposed between the sealing nozzle 7 and the substrate 1. The elastic element 5 is used to apply an elastic force to the sealing nozzle 7 and the substrate 1 to move them away from each other.

[0022] In use, the base plate 1 is located at the top and is used to connect the steam generator 12, such as by welding. Alternatively, in some embodiments, the base plate 1 can be directly the base plate of the steam generator 12, that is, the outlet pipe 2 is directly fixed on the base plate of the steam generator 12. The outlet pipe 2 is connected to the edge of the first through hole 101 and extends downward.

[0023] The sealing nozzle 7 includes a pipe body 703, an upward-facing insertion port, and an annular cavity 701 communicating with the insertion port. A second through hole 702 is provided on the bottom side of the annular cavity 701 opposite to the insertion port. The bottom end of the outlet pipe 2 is inserted into the annular cavity 701 via the insertion port. The opening size of the second through hole 702 is adjustable, allowing for flow distribution among multiple steam generators 12 by adjusting the diameter of the second through hole 702. The sealing nozzle 7 is used to connect to the flow distribution assembly 10, and the second through hole 702 communicates with the reactor coolant fluid path in the flow distribution assembly. The reactor coolant flows from the steam generator 12 to the outlet pipe 2, then into the annular cavity 701, and finally into the flow distribution assembly 10 through the second through hole 702.

[0024] After installation, there is a gap between the top of the sealing nozzle 7 and the base plate 1, and between the bottom of the outlet pipe 2 and the bottom surface of the annular cavity 701, which allows the outlet pipe 2 and the sealing nozzle 7 to move relative to each other in the vertical direction. In this embodiment, the outlet pipe 2 is inserted into the pipe body 703.

[0025] The elastic element 5 can be of various types, such as a spring or soft rubber. When the steam generator 12 and / or pressure vessel 9 change from a cold state (installation state) to a hot state (operating state), the deformation of the elastic element 5 can cause a change in the position between the base plate 1 and the sealing nozzle 7, thereby compensating for the expansion difference and solving the problem of structural fatigue failure caused by excessive thermal stress. At the same time, the elastic element 5 is in a compressed state, continuously pressing the sealing nozzle 7 against the flow distribution assembly 10. When the pressure vessel 9 causes the flow distribution assembly 10 to move, or when vibration occurs, the sealing nozzle 7 can still be tightly connected to the flow distribution assembly 10, reducing leakage at the contact surface and ensuring the safety of the reactor core.

[0026] The present invention provides an elastic support device, a steam generator assembly, and a nuclear reactor system. By setting an elastic element between the sealing nozzle and the base plate, the expansion difference generated by the steam generator from a cold state to a hot state is compensated. At the same time, the elastic force provided by the elastic element ensures that the bottom of the elastic support device remains in close contact with the flow distribution assembly under the action of external forces such as vibration and seismic loads. This ensures that the steam generator and the flow distribution assembly are always in close contact, effectively reducing the risk of leakage at the contact surface and ensuring the long-term safe operation of the steam generator.

[0027] In one embodiment, the elastic support device further includes at least one sealing ring 3, which is located between the outlet pipe 2 and the inner wall of the annular cavity 701, and the sealing ring 3 is in sliding engagement with the inner wall of the annular cavity 701.

[0028] The number of sealing rings 3 can be multiple, such as two, with the two sealing rings 3 spaced apart axially along the outlet nozzle 2. The sealing rings 3 can be metal elastic sealing rings with openings. By elastically abutting against the inner wall of the annular cavity 701, they ensure minimal leakage of the elastic support structure itself, guaranteeing core safety. Simultaneously, the sealing rings 3, being made of metal, can slide well against the inner wall of the annular cavity 701, thus allowing relative sliding between the outlet nozzle 2 and the sealing nozzle 7 under different operating conditions.

[0029] In one embodiment, the outer wall of the outlet pipe 2 is provided with an embedding groove, and the sealing ring 3 is embedded in the embedding groove to seal the ring cavity 701. Specifically, the end of the sealing ring 3 may protrude from the opening of the embedding groove to abut against the inner wall of the ring cavity 701. This ensures the stability of the relative position between the sealing ring 3 and the outlet pipe 2, preventing it from coming off the outlet pipe 2 or becoming misaligned, thus affecting the sealing performance.

[0030] Other sealing methods are also possible. In some embodiments, the outlet pipe 2 and the sealing nozzle 7 may not be in a plug-in relationship. For example, the outlet pipe 2 and the sealing nozzle 7 may be spaced apart. The support device also includes a bellows, with both ends of the bellows connected to the outlet pipe 2 and the sealing nozzle 7 respectively, to ensure the seal between the outlet pipe 2 and the sealing nozzle 7 without affecting the relative movement between the outlet pipe 2 and the sealing pipe 7.

[0031] The elastic element 5 can be a spring, which can be directly disposed between the top of the tube body 703 and the base plate 1, and can be formed by welding or other methods. Alternatively, this application also provides the following embodiment, in which the elastic support device further includes a spring positioning post 4. The sealing nozzle 7 includes a tube body 703 and an extension plate 704. The tube body 703 has an annular cavity 701, and the extension plate 704 is disposed on the outer periphery of the tube body 703 and extends outward. The spring positioning post 4 is connected to the base plate 1 and movably passes through the extension plate 704, and the spring is fitted on the spring positioning post 4.

[0032] The spring positioning post 4 ensures that the spring extends and contracts vertically without bending laterally, preventing unstable spring deformation that could affect performance. The use of the extension plate 704 increases the overall length of the spring compared to placing it between the top of the tube 703 and the base plate 1, thus providing a wider range of elastic adjustment. Furthermore, it provides a structural foundation for the installation of the spring positioning post 4, allowing multiple springs to be arranged in different positions. These multiple springs form a self-balancing elastic adjustment structure, ensuring that the bottom of the sealing nozzle 7 is evenly and tightly fitted to the diverter assembly 10 in all directions around the tube, preventing warping and reducing the requirement for the bottom of the sealing nozzle 7 to be level during installation.

[0033] In one embodiment, the elastic support device further includes an adjusting nut 8, and a spring positioning post 4 with external threads. The adjusting nut 8 is threadedly connected to the spring positioning post 4 from one side of the extension plate 704 opposite to the base plate 1. By turning the adjusting nut 8, the compression and clamping force of the elastic element 5 can be adjusted to ensure sufficient support force. At the same time, the levelness of the bottom of the sealing nozzle 7 can be adjusted to avoid warping at the contact point with the diversion assembly 10, thereby making installation more convenient and accurate.

[0034] In some embodiments, the adjusting nut 8 can be replaced by a bushing. The bushing can be interference-fitted with the spring positioning pin 4, and the relative position of the bushing and the spring positioning pin 4 can be adjusted by tapping to achieve the effect of adjusting the compression and clamping force of the elastic element 5. Compared with the adjusting nut 8, the interference fit can prevent loosening and falling off after prolonged use, but the adjusting nut 8 has the advantage of convenient adjustment.

[0035] Before the steam generator 12 is installed, in its free state, the compression of the elastic element 5 is limited by the adjusting nut 8; that is, the spring compression is determined by the position of the adjusting nut 8. During installation, the steam generator 12 and the diversion assembly 10 work together to further compress the spring. After installation, the spring length is shorter than the length after adjusting the adjusting nut 8. This causes the spring to exert force on the sealing nozzle 7, allowing it to be tightly pressed against the diversion assembly 10. In the operating state, i.e., under high-temperature conditions, due to the difference in thermal expansion, the steam generator 12 and the diversion assembly 10 move relative to each other. The compression of the elastic element 5 further increases or slightly decreases compared to the installed state. However, the elasticity of the elastic element 5 still allows the sealing nozzle 7 to be pressed tightly against the diversion assembly 10. This is achieved through precise design of the spring compression.

[0036] In one embodiment, the elastic support device further includes a spring sleeve 6, which is connected to the base plate 1 and surrounds the outer periphery of the spring portion structure.

[0037] The spring sleeve 6 serves to protect the spring and facilitate installation, and also prevents failure caused by excessive spring compression. It is understood that there is a distance between the bottom end of the spring sleeve 6 and the extension plate 704 of the sealing nozzle 7 to avoid affecting the relative movement of the sealing nozzle 7 and the base plate 1.

[0038] In one embodiment, there are multiple elastic elements 5, which are evenly distributed around the outlet pipe 2 in the circumference.

[0039] The number of elastic elements 5 can be three, four, six, eight, etc., and they are evenly distributed around the outlet pipe 2 to ensure balanced force application and ensure that the sealing nozzle 7 effectively presses against the diversion component 10. At the same time, it avoids the sealing ring 3 from failing due to misalignment between the outlet pipe 2 and the sealing pipe 7.

[0040] In one embodiment, the sealing nozzle 7 includes a tube body 703 and an extension plate 704. The tube body 703 has an annular cavity 701, and the extension plate 704 is disposed on the outer periphery of the tube body 703 and extends outward. A force-applying lug 741 is provided on the extension plate 704, and the force-applying lug 741 protrudes from the edge of the extension plate 704.

[0041] When installing the elastic support device, a clamping device is used to apply force to the force-applying lug 741, causing the spring to compress, and then the steam generator is installed onto the flow distribution assembly. There can be two force-applying lugs 741, which are arranged on opposite radial sides of the tube body 703 to achieve uniform force application from both radial sides.

[0042] On the other hand, the present invention also provides a steam generator assembly, including an elastic support device as described above, and a steam generator 12. The base plate of the steam generator 12 is connected to the base plate 1, such as by welding, or the base plate of the steam generator 12 is integrally formed with the base plate 1, that is, the outlet pipe 2 can be directly connected to the base plate of the steam generator 12, which can reduce installation errors, reduce structural volume, and reduce weight.

[0043] The steam generator assembly includes any of the aforementioned resilient support devices, and the advantages of including any of the aforementioned resilient support devices will not be elaborated further.

[0044] On the other hand, such as Figure 3 As shown, the present invention also provides a nuclear reactor system, including the steam generator assembly described above, as well as a pressure vessel 9, a flow distribution assembly 10, and a basket 11. The basket 11 is used to connect the reactor core and is located inside the pressure vessel 9. The steam generator assembly is disposed between the basket 11 and the pressure vessel 9 and is located above the flow distribution assembly 10. The sealing nozzle 7 abuts against the flow distribution assembly 10, and the second through hole 702 communicates with the flow distribution assembly 10.

[0045] The steam generator 12 can be fixed to the pressure vessel 9 in various ways, such as welding the top of the steam generator 12 to the side wall of the pressure vessel 9.

[0046] In some embodiments, the top surface of the diversion assembly 10, which is used to contact the elastic support device, is provided with a groove. The reactor coolant channel of the diversion assembly 10 is opened at the bottom of the groove, and the opening area of ​​the groove is slightly larger than the bottom surface of the sealing nozzle 7. The sealing nozzle 7 can then be embedded in the groove, achieving convenient positioning and limiting. In some embodiments, the system also includes a seal, which can be located on the outer periphery of the portion of the sealing nozzle 7 that is embedded in the groove. The seal can be a metal sealing ring, and further sealing between the sealing nozzle 7 and the diversion assembly 10 is achieved by the outward tightening of the seal. Alternatively, in some other embodiments, the seal can be provided on the bottom surface of the sealing nozzle 7. The seal is achieved by the bottom of the groove pressing against the seal, thus further preventing large leakage at the bottom of the steam generator 12 and ensuring the safe and stable operation of the steam generator.

[0047] The nuclear reactor system includes the aforementioned steam generator assembly, and the advantages of including the aforementioned steam generator assembly will not be elaborated further.

[0048] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An elastic support device, characterized in that, For use in a steam generator, the elastic support device includes: Substrate (1), outlet pipe (2), elastic element (5) and sealing nozzle (7); The substrate (1) has a first through hole (101), the substrate (1) is connected to the outlet pipe (2), and the outlet pipe (2) communicates with the first through hole (101). The outlet pipe (2) is used to flow reactor coolant. The sealing nozzle (7) includes a pipe body (703) and an extension plate (704). The pipe body (703) has an annular cavity (701), and the extension plate (704) is disposed on the outer periphery of the pipe body (703). The annular cavity (701) has a second through hole (702) on the other side of the outlet pipe (2). The end of the outlet pipe (2) away from the substrate (1) is inserted into the annular cavity (701) of the sealing nozzle (7). The elastic element (5) is disposed between the sealing nozzle (7) and the substrate (1), and the elastic element (5) is used to apply an elastic force to the sealing nozzle (7) and the substrate (1) to move them away from each other.

2. The elastic support device according to claim 1, characterized in that, The elastic support device further includes: At least one sealing ring (3) is located between the outlet pipe (2) and the inner wall of the ring cavity (701), and the sealing ring (3) slides with the inner wall of the ring cavity (701).

3. The elastic support device according to claim 2, characterized in that, The outer wall of the outlet pipe (2) is provided with an embedding groove, and the sealing ring (3) is embedded in the embedding groove to seal the annular cavity (701).

4. The elastic support device according to claim 1, characterized in that, The elastic element (5) is a spring, and the elastic support device also includes a spring positioning column (4). The upper end of the spring positioning post (4) is connected to the base plate (1) and is movably connected to the extension plate (704). The spring is fitted on the spring positioning post (4).

5. The elastic support device according to claim 4, characterized in that, The elastic support device further includes: Adjusting nut (8), the spring positioning post (4) includes external thread, the adjusting nut (8) is threaded to the spring positioning post (4) on the side of the extension plate (704) opposite to the base plate (1).

6. The elastic support device according to claim 4, characterized in that, The elastic support device further includes: The spring sleeve (6) is connected to the substrate (1) and surrounds the outer periphery of the spring portion structure.

7. The elastic support device according to claim 1, characterized in that, The number of elastic elements (5) is multiple, and the multiple elastic elements (5) are evenly distributed around the outlet pipe (2) in the circumference.

8. The elastic support device according to claim 1, characterized in that, The sealing nozzle (7) includes a tube body (703) and an extension plate (704). The tube body (703) has the annular cavity (701), and the extension plate (704) is disposed on the outer periphery of the tube body (703) and extends outward. The extension plate (704) is provided with a force-applying ear plate (741), which protrudes from the edge of the extension plate (704).

9. A steam generator assembly, characterized in that, Includes the elastic support device as described in any one of claims 1-8, and A steam generator (12) has a base plate connected to the substrate (1), or the base plate of the steam generator (12) is integrally formed with the substrate (1).

10. A nuclear reactor system, characterized in that, Includes the steam generator assembly as described in claim 9 above, and Pressure vessel (9), flow diversion assembly (10) and basket (11); The basket (11) is used to connect the reactor core, and the basket (11) is located inside the pressure vessel (9). The steam generator assembly is disposed between the basket (11) and the pressure vessel (9) and is located above the diversion assembly (10). The sealing nozzle (7) abuts against the diversion assembly (10), and the second through hole (702) communicates with the diversion assembly (10).

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