A secondary support device for a research reactor

Abstract

The application discloses a secondary supporting device suitable for a research reactor, which comprises a supporting assembly, a buffer plate, a supporting cylinder, a measuring plate and a pressing assembly, the lower side of the buffer plate is connected with the upper end of the supporting assembly, the lower end of the supporting cylinder is connected with the buffer plate, the measuring plate is connected with the upper end of the supporting cylinder, the pressing assembly is fixedly arranged on the upper side of the measuring plate, and a hanging basket assembly applies a downward force to the pressing assembly; the measuring plate is arranged on the upper end of the supporting cylinder, and the measuring plate provides arrangement space for measuring the outlet temperature of a reactor core, so that the removal and replacement of a damaged thermocouple are facilitated.

Description

Technical Field

[0001] This invention relates to the field of nuclear power facility technology, and more specifically to a secondary support device suitable for research reactors. Background Technology

[0002] Research reactors can be used for research on power reactors, as well as for irradiation research in fields such as materials, chemistry, isotopes, and medicine. Research reactors are an important means of developing atomic energy technology.

[0003] To improve the safety of the research reactor, in the event of a core fall accident, secondary support is needed to limit the core fall height, ensure that the control rod assembly can be smoothly inserted into the core, and transfer the load of the part below the fracture point of the basket assembly and the core components to the pressure vessel base plate, providing support and positioning for the drive line mechanical buffer.

[0004] Currently, most research reactors at home and abroad adopt an integrated structure of suspended basket and secondary support. Thermocouples are installed at the core outlet or grid plate. If the thermocouple is damaged, it is impossible to remove and replace the thermocouple, resulting in the failure of some measuring points in the core. Summary of the Invention

[0005] The technical problem to be solved by this invention is that it is difficult to replace damaged thermocouples in a research reactor. The purpose is to provide a secondary support device suitable for research reactors.

[0006] This invention is achieved through the following technical solution:

[0007] A secondary support device suitable for research reactors, comprising:

[0008] A support assembly having an upper end and a lower end;

[0009] A buffer plate, which is horizontally arranged and has an upper side and a lower side, wherein the lower side of the buffer plate is connected to the upper end of the support assembly;

[0010] A support cylinder having an upper end and a lower end, the lower end of which is connected to the buffer plate;

[0011] A measuring plate, which is horizontally arranged and has an upper side and a lower side, is connected to the upper end of the support cylinder;

[0012] A clamping assembly is fixedly mounted on the upper side of the measuring plate, and the basket assembly applies a downward force to the clamping assembly.

[0013] Optionally, the support assembly includes:

[0014] The vertically arranged support columns have an upper end and a lower end, and a plurality of the support columns are arranged in a ring.

[0015] A connecting flange is provided, which is horizontally positioned, and the upper end of the support column is fixedly connected to the connecting flange.

[0016] The support assembly is connected to the buffer plate via the connecting flange.

[0017] Furthermore, the support assembly also includes:

[0018] At least one horizontally arranged connecting plate is provided with a plurality of circular holes corresponding to the support column, the support column is disposed in the circular holes, and the support column is fixedly connected to the connecting plate.

[0019] Specifically, the buffer plate is a circular plate structure with a boss on the upper side, and the buffer plate is fixedly connected to the connecting flange by fasteners;

[0020] The buffer plate is provided with a plurality of vertical first through holes, which penetrate the lower side and the upper side of the buffer plate.

[0021] Optionally, both ends of the support cylinder are provided with end flanges, the buffer plate is fixedly connected to the lower end flange of the support cylinder by fasteners, and the boss is located inside the support cylinder;

[0022] The support cylinder is provided with a plurality of second through holes, the second through holes penetrating the inner side and the outer side of the support cylinder, and the central axis of the second through holes coincides with the radial direction of the support cylinder.

[0023] Preferably, the diameter of the boss is equal to the inner diameter of the support cylinder.

[0024] Optionally, the measuring plate is a circular plate structure, and the measuring plate is fixedly connected to the end flange at the upper end of the support cylinder by fasteners;

[0025] The measuring plate is provided with multiple vertical third through holes, which penetrate the lower side and the upper side of the measuring plate.

[0026] Optionally, at least four grooves are provided on the end flange at the upper end of the support cylinder, and the grooves cooperate with the positioning key provided on the pressure vessel to define the radial and circumferential positions of the support cylinder relative to the pressure vessel.

[0027] Optionally, the upper side of the measuring plate is provided with an output channel for extracting measurement data of the core outlet temperature.

[0028] Specifically, the clamping assembly includes:

[0029] A disc spring seat fixedly connected to the upper side of the measuring plate;

[0030] The disc spring mounted on the disc spring seat; and

[0031] The basket assembly applies a downward force to the cover plate, which is connected to the upper end of the disc spring and can move up and down.

[0032] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0033] The present invention provides space for measuring the core outlet temperature by installing a measuring plate at the upper end of the support cylinder, and facilitates the removal and replacement of damaged thermocouples if necessary.

[0034] This invention can limit the core drop height, ensure the smooth insertion of the control rod assembly into the core, and transfer the load of the part below the fracture point of the basket assembly and the core components to the pressure vessel bottom plate, providing support and positioning for the mechanical buffer of the drive line.

[0035] Meanwhile, during normal operation of the research reactor, the basket assembly of this invention presses the entire secondary support device axially through the clamping assembly, and achieves positioning in the radial and circumferential directions through the positioning key fixed on the pressure vessel. Attached Figure Description

[0036] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the principles of the invention. These drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, but do not constitute a limitation on the embodiments of the present invention.

[0037] Figure 1 This is a schematic diagram of a secondary support device suitable for a research reactor according to the present invention.

[0038] Figure 2 This is a schematic diagram of the structure of the buffer plate according to the present invention.

[0039] Reference numerals: 1-Clamping assembly, 2-Measuring plate, 3-Positioning key, 4-Support cylinder, 5-Buffer plate, 6-Support assembly, 6-1 Support column, 6-2 Connecting plate, 7-Outlet channel. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0041] It should also be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] Where there is no conflict, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] Example 1

[0046] like Figure 1 As shown, a secondary support device suitable for a research reactor includes a support assembly 6, a buffer plate 5, a support cylinder 4, a measuring plate 2, and a clamping assembly 1.

[0047] The support assembly 6 is configured to have an upper end and a lower end, the buffer plate 5 has an upper side and a lower side, and the support cylinder 4 has an upper end and a lower end.

[0048] In this embodiment, the support assembly 6 includes a vertically arranged support column 6-1 and a connecting flange. The support column 6-1 has an upper end and a lower end, and multiple support columns 6-1 are arranged in a ring to fit the connecting flange. That is, the central axis of the ring structure formed by multiple support columns 6-1 coincides with the central axis of the connecting flange. The connecting flange is horizontally arranged, and the upper end of the support column 6-1 is fixedly connected to the connecting flange. The support column 6-1 is vertically fixedly connected to the lower side of the connecting flange, and the connection position of the support column 6-1 does not overlap with the position of the connection hole of the connecting flange, and does not interfere with the fasteners connected to the connecting flange.

[0049] The buffer plate 5 is set horizontally, and the lower side of the buffer plate 5 is connected to the upper end of the support assembly 6. That is, the lower side of the buffer plate 5 is fixedly connected to the connecting flange, and the lower end of the support cylinder 4 is connected to the buffer plate 5. The buffer plate 5 serves to connect the support assembly 6 and the support cylinder 4.

[0050] The measuring plate 2 is set horizontally and connected to the upper end of the support cylinder 4; the measuring plate 2 is positioned and connected to the upper end of the support cylinder 4, providing arrangement space and lead-out channel 7 for measuring the core outlet temperature.

[0051] The clamping assembly 1 is fixedly mounted on the upper side of the measuring plate 2, and the basket assembly applies a downward force to the clamping assembly 1. The clamping force provided by the basket assembly restricts the axial movement of the support device, compensates for manufacturing and installation errors and thermal expansion differences of the basket assembly and the support device, and also plays a certain role in buffering the impact of a core fall accident.

[0052] By setting up the measuring plate 2, thermocouples can be arranged on it, solving the problem of thermocouple lead-out and fixation. This provides arrangement space and lead-out channel 7 for measuring the core outlet temperature. Simultaneously, the measuring plate 2 and the support cylinder 4 use a clearance fit and spring clamping method, allowing for remote assembly and disassembly, facilitating the removal and replacement of damaged thermocouples. Furthermore, in the event of a core fall during the study reactor operation, the measuring plate can limit the core fall height and ensure smooth insertion of the control rod assembly into the core. Also, in the event of a hypothetical basket cylinder breakage accident, the measuring plate will rest on the support cylinder 4, transferring the load of the core assembly to the pressure vessel base plate through the support column 6-1, ensuring the core assembly remains essentially in its original position, not affecting the drive line channel, and providing support and positioning for the drive line mechanical buffer.

[0053] Example 2

[0054] This embodiment is a further optimization of some of the structures in Embodiment 1.

[0055] In this embodiment, the support assembly 6 further includes at least one horizontally arranged connecting plate 6-2. Figure 1 There are two in the middle.

[0056] The connecting plate 6-2 is provided with a plurality of circular holes corresponding to the support column 6-1. The support column 6-1 is disposed in the circular holes and is fixedly connected to the connecting plate 6-2. In this embodiment, the connection is fixed by welding.

[0057] like Figure 2 As shown, the buffer plate 5 is a circular plate structure with a boss on the upper side. The buffer plate 5 is fixedly connected to the connecting flange by fasteners. The diameter of the boss is equal to the inner diameter of the support cylinder 4. During installation, the boss is located inside the support cylinder 4. That is, when the support cylinder 4 is installed on the buffer plate 5, the function of precise positioning can be achieved.

[0058] In addition, to facilitate the connection between the support cylinder 4, the buffer plate 5, and the measuring plate 2, end flanges are provided at both ends of the support cylinder 4. The buffer plate 5 is fixedly connected to the end flange at the lower end of the support cylinder 4 by fasteners.

[0059] The measuring plate 2 is a circular plate structure, and the measuring plate 2 is fixedly connected to the end flange at the upper end of the support cylinder 4 by fasteners.

[0060] The fasteners used in this embodiment are a type of mechanical part used for fastening connections and are extremely widely applied. Fasteners are used in a wide range of industries, including energy, electronics, electrical appliances, machinery, chemicals, metallurgy, mold making, hydraulics, etc. Various types of fasteners can be found on all kinds of machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemicals, meters, and supplies, making them the most widely used basic mechanical components. They are characterized by a wide variety of types and specifications, diverse performance and applications, and a very high degree of standardization, serialization, and generalization. Therefore, some people refer to fasteners with existing national standards as standard fasteners, or simply standard parts.

[0061] Fasteners typically include various types of parts such as bolts, studs, screws, nuts, automatic screws, wood screws, washers, retaining rings, pins, rivets, components and connecting pairs, and weld studs. Those skilled in the art can select appropriate fasteners for use in this embodiment based on specific circumstances.

[0062] In addition, in this embodiment, the buffer plate 5, the support cylinder 4 and the measuring plate 2 are all provided with through holes, which can reduce weight and material consumption without affecting strength.

[0063] The buffer plate 5 is provided with multiple vertical first through holes, which penetrate the lower side and the upper side of the buffer plate 5.

[0064] The support cylinder 4 is provided with multiple second through holes, which penetrate the inner side and the outer side of the support cylinder 4, and the central axis of the second through hole coincides with the radial direction of the support cylinder 4.

[0065] The measuring plate 2 is provided with multiple vertical third through holes, which penetrate the lower side and the upper side of the measuring plate 2.

[0066] In addition, in order to achieve the cooperation between the support device and the pressure vessel, at least four grooves are provided on the end flange at the upper end of the support cylinder 4, and the grooves cooperate with the positioning key 3 provided on the pressure vessel to define the radial and circumferential positions of the support cylinder 4 relative to the pressure vessel.

[0067] During installation, the radial and axial positioning of the support cylinder 4 and the pressure transmitter is achieved by engaging the groove with the positioning key 3, thus avoiding relative movement and rotation.

[0068] Example 3

[0069] This embodiment provides a brief description of the structure of the clamping assembly 1. The clamping assembly 1 needs to have a certain degree of elasticity, therefore it includes:

[0070] The disc spring seat is fixedly connected to the upper side of the measuring plate 2, thereby fixing the position of the clamping assembly 1.

[0071] A disc spring mounted on a disc spring seat; and

[0072] The cover plate, which is connected to the upper end of the disc spring and can move up and down, is subjected to a downward force by the basket assembly.

[0073] The force exerted by the suspended platform assembly on the cover plate is transmitted to the disc spring, which deforms and changes the length of the clamping assembly 1, thereby compensating for manufacturing and installation errors and thermal expansion differences of the suspended platform assembly and the support device.

[0074] In the description of this specification, the references to terms such as "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example is included in at least one embodiment / mode or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.

[0075] 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 at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0076] Those skilled in the art should understand that the above embodiments are merely for illustrating the present invention and are not intended to limit the scope of the invention. Those skilled in the art can make other changes or modifications based on the above invention, and these changes or modifications still fall within the scope of the present invention.

Claims

1. A secondary support device suitable for research reactors, characterized in that, include: Support assembly (6) having an upper end and a lower end; The buffer plate (5) is horizontally arranged and has an upper side and a lower side. The lower side of the buffer plate (5) is connected to the upper end of the support assembly (6). The buffer plate (5) is a circular plate structure with a boss on the upper side. The support cylinder (4) has an upper end and a lower end, the lower end of which is connected to the buffer plate (5); Measuring plate (2), which is horizontally arranged and has an upper side and a lower side, the measuring plate (2) being connected to the upper end of the supporting cylinder (4); A clamping assembly (1) is fixedly disposed on the upper side of the measuring plate (2), and the basket assembly applies a downward force to the clamping assembly (1); The clamping assembly (1) includes: a disc spring seat fixedly connected to the upper side of the measuring plate (2), a disc spring mounted on the disc spring seat, and a cover plate connected to the upper end of the disc spring and movable up and down. The basket assembly applies a downward force to the cover plate. Both ends of the support cylinder (4) are provided with end flanges, the buffer plate (5) is fixedly connected to the end flange at the lower end of the support cylinder (4) by fasteners, and the boss is located inside the support cylinder (4). The support cylinder (4) is provided with a plurality of second through holes, the second through holes penetrating the inner side surface and the outer side surface of the support cylinder (4), and the central axis of the second through hole coincides with the radial direction of the support cylinder (4); At least four grooves are provided on the end flange at the upper end of the support cylinder (4), and the grooves cooperate with the positioning key (3) provided on the pressure vessel to define the radial and circumferential positions of the support cylinder (4) relative to the pressure vessel.

2. A secondary support device suitable for a research reactor according to claim 1, characterized in that, The support assembly (6) includes: The vertically arranged support column (6-1) has an upper end and a lower end, and the plurality of the support columns (6-1) are arranged in a ring. A connecting flange is provided, which is horizontally positioned, and the upper end of the support column (6-1) is fixedly connected to the connecting flange. The support assembly (6) is connected to the buffer plate (5) via the connecting flange.

3. A secondary support device suitable for a research reactor according to claim 2, characterized in that, The support assembly (6) further includes: At least one horizontally arranged connecting plate (6-2) is provided with a plurality of circular holes corresponding to the support column (6-1), the support column (6-1) is disposed in the circular holes, and the support column (6-1) is fixedly connected to the connecting plate (6-2).

4. A secondary support device suitable for a research reactor according to claim 2, characterized in that, The buffer plate (5) is fixedly connected to the connecting flange by fasteners; The buffer plate (5) is provided with a plurality of vertical first through holes, the first through holes penetrating the lower side and the upper side of the buffer plate (5).

5. A secondary support device suitable for a research reactor according to claim 1, characterized in that, The diameter of the boss is equal to the inner diameter of the support cylinder (4).

6. A secondary support device suitable for a research reactor according to claim 1, characterized in that, The measuring plate (2) is a circular plate structure, and the measuring plate (2) is fixedly connected to the end flange at the upper end of the support cylinder (4) by fasteners; The measuring plate (2) is provided with a plurality of vertical third through holes, which penetrate the lower side and the upper side of the measuring plate (2).

7. A secondary support device suitable for a research reactor according to claim 6, characterized in that, The upper side of the measuring plate (2) is provided with an extraction channel (7) for extracting measurement data of the core outlet temperature.

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