Fuel assembly transport container and top cover device thereof

Abstract

A fuel assembly transport container and a top cover device thereof, the top cover device comprising a door panel for covering the upper end of a transport container cavity, and a locking structure mounted on the door panel to axially lock a fuel assembly (3) in the transport container (4). The locking structure comprises a first locking rod (2222) and a second locking rod (2223) which are mounted on the door panel in an axially adjustable manner, the first locking rod (2222) being located in the middle of the door panel and opposite to the center position of an upper tube seat of the fuel assembly (3), and the second locking rod (2223) comprising at least two rods which are centrally symmetrically arranged around the first locking rod (2222). Without disassembling the door panel, the first locking rod (2222) and the second locking rod (2223) of the locking structure can be adjusted independently, and can be used to compress a fuel assembly (3) without related components, and can also be used to compress a fuel assembly (3) with related components, and is multifunctional, easy to operate, and simple to maintain.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power, and more particularly to a fuel assembly transport container and a top sealing device thereof. Background Art

[0002] In the related art, the upper end of the fuel assembly in the fuel assembly transport container is usually fixed in place after being compressed by the upper end plate. Since the position of the upper end plate is fixed, it is easy to cause over-pressure or loose compression of the fuel assembly, which poses certain safety hazards. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a fuel assembly transport container and a top sealing device thereof.

[0004] The technical solution adopted by the present invention to solve the technical problem is: construct a top cover device for a fuel assembly transport container, comprising a door plate used to cover the upper end of the transport container cavity, and a locking structure installed on the door plate to axially lock the fuel assembly in the transport container;

[0005] The locking structure includes a first locking rod and a second locking rod which are axially adjustable and mounted on the door plate. The first locking rod is located in the middle of the door plate and is opposite to the center position of the upper tube seat of the fuel assembly. The second locking rod includes at least two rods which are centrally symmetrically arranged around the first locking rod.

[0006] Preferably, the first locking rod and the second locking rod are respectively screwed to the door panel.

[0007] Preferably, an adjusting nut is threadedly connected to one end of the first locking rod and the second locking rod away from the transport container cavity.

[0008] Preferably, the ends of the first locking rod and the second locking rod opposite to the transport container cavity are provided with soft buffer heads.

[0009] Preferably, the buffer head is a soft rubber pad.

[0010] Preferably, a pressing block is provided at the end of the first locking rod and the second locking rod opposite to the transport container cavity, and the buffer head is installed on the side of the pressing block opposite to the cavity.

[0011] Preferably, the buffer head is sleeved onto the pressing block.

[0012] Preferably, a compression spring is distributed on a side of the upper tube seat of the fuel assembly opposite to the door plate, and the second locking rod is opposite to the compression spring on the upper tube seat of the fuel assembly.

[0013] Preferably, the top cover device comprises two door panels hinged to each other, each of the door panels is provided with the locking structure, and each of the door panels is respectively opposite to the position of the cavity containing different fuel assemblies in the transport container.

[0014] A fuel assembly transport container comprises the top sealing device.

[0015] The fuel assembly transport container and the top cover device thereof of the present invention have the following beneficial effects: without disassembling the door panel, the first locking rod and the second locking rod of the locking structure can be adjusted independently, and can be used to compress fuel assemblies without related components, and can also be used to compress fuel assemblies with related components. The device has multifunctional use, is easy to operate, and is simple to maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0017] Figure 1 is a schematic diagram of the three-dimensional structure of a fuel assembly transport container in an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A schematic diagram of the structure of the supporting assembly of the fuel assembly transport container when it is erected;

[0019] Figure 3 yes Figure 1 A schematic diagram of the upper shell after opening;

[0020] Figure 4 yes Figure 1 An exploded schematic diagram of a fuel assembly transport container;

[0021] Figure 5 yes Figure 1 A schematic cross-sectional view of a support assembly in FIG.

[0022] Figure 6 yes Figure 5 A cross-sectional schematic diagram of a buffer member of the buffer structure;

[0023] Figure 7 yes Figure 4 A schematic diagram of a cover plate of the middle support assembly being flipped open;

[0024] Figure 8 yes Figure 4 A schematic cross-sectional view of a support assembly in FIG.

[0025] Fig. 9 yes Figure 8 A schematic cross-sectional view of an outer cover plate and an assembly on the outer cover plate;

[0026] Fig.10 yes Figure 4 A three-dimensional schematic diagram of the lower end cover in FIG.

[0027] Fig.11 yes Fig.10 A schematic cross-sectional view of the middle and lower end covers;

[0028] Fig.12 yes Fig.11 A three-dimensional schematic diagram of the shutter being opened;

[0029] Fig.13 yes Figure 4 A three-dimensional schematic diagram of the upper end cover in FIG. DETAILED DESCRIPTION

[0030] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0031] like Figures 1 to 4 As shown, a fuel assembly transport container in a preferred embodiment of the present invention comprises an outer shell 1 and a support structure 2 disposed in the outer shell 1 , wherein the support structure 2 comprises a load-bearing frame 21 and a support assembly 22 .

[0032] The carrier 21 is mounted inside the housing 1, and the support assembly 22 is mounted on the carrier 21. The support assembly 22 is formed with two cavities 4 for accommodating and fixing the fuel assembly 3. The fuel assembly 3 is generally a columnar structure. The support assembly 22 can drive the fuel assembly 3 in the cavity 4 to be placed horizontally or upright.

[0033] The other end of the support assembly 22 is provided with a loading and unloading port. When the support assembly 22 is erected, the loading and unloading port is located at the upper end of the cavity 4, allowing the fuel assembly 3 to be axially inserted into the cavity 4 from the loading and unloading port, or axially removed from the cavity 4 from the loading and unloading port.

[0034] A lower end cover 225 for circumferentially positioning the fuel assembly 3 is provided at one end of the cavity 4 opposite to the loading and unloading port, and an upper end cover 222 for sealing the cavity 4 and axially positioning the fuel assembly 3 in the cavity 4 is installed on the loading and unloading port.

[0035] The support assembly 22 can be rotated in a horizontal state and a vertical state under the action of the crane. When the support assembly 22 is in a vertical state, it is convenient to vertically hang the fuel assembly 3 into the cavity 4, and it is also convenient to rotate the support assembly 22 with the fuel assembly 3 to a horizontal state. The loading process of the fuel assembly 3 is simpler and faster, and the loading efficiency is improved. After the support assembly 22 and the fuel assembly 3 are placed horizontally at the same time, they are accommodated in a transport container, which can facilitate the transportation of the fuel assembly 3.

[0036] After the fuel assembly 3 is placed in the cavity 4 and before the upper end cover 222 is sealed, the fuel assembly 3 is already circumferentially positioned to prevent rotation in the cavity 4. After the upper end cover 222 is sealed, the fuel assembly 3 can be axially positioned to prevent longitudinal movement in the cavity 4, thereby achieving full restraint of the fuel assembly 3 and preventing shaking in the cavity 4 during transportation, thereby improving the safety and stability of transportation.

[0037] Combination Figure 5 As shown, typically, the housing 1 includes a lower shell 11 and an upper shell 12 installed on the upper side of the lower shell 11. The lower shell 11 and the upper shell 12 are assembled to form a columnar structure with a horizontal axis, which is convenient for loading and transportation. In this embodiment, the columnar structure is an octagonal column. Of course, the outer shape of the housing 1 can also be a square columnar structure with a horizontal axis.

[0038] The side walls of the lower shell 11 and the upper shell 12 are both double-layer structures with hollow interlayers, so that the shell has high impact resistance and excellent heat insulation, shock absorption and decontamination properties.

[0039] Preferably, the upper shell 12 includes an upper outer shell 122, an upper inner shell 123, and upper end plates 124 arranged at both ends, and the upper outer shell 122 and the upper inner shell 123 are spaced apart from each other to form a double-layer structure with a hollow interlayer. The lower shell 11 includes a lower outer shell 112, a lower inner shell 113, and lower end plates 114 arranged at both ends, and the lower outer shell 112 and the lower inner shell 113 are spaced apart from each other to form a double-layer structure with a hollow interlayer.

[0040] The upper outer shell 122 and the upper inner shell 123, as well as the lower outer shell 112 and the lower inner shell 113 are filled with heat-insulating and shock-absorbing materials. The double-layer structure is filled with heat-insulating and shock-absorbing materials, which can effectively reduce the vibration generated when the container falls and the impact of external impact on the components in the container, and reduce the conduction of heat to the inside of the shell during fire conditions. The heat-insulating and shock-absorbing materials can be formed and filled into the polygonal double-layer structure of the upper shell and the lower shell, which is small in size and easy to replace; at the same time, the container can contain multiple groups of fuel assemblies.

[0041] Furthermore, reinforcing ribs 13 are provided between the upper outer shell 122 and the upper inner shell 123 , and between the lower outer shell 112 and the lower inner shell 113 , which can enhance the strength of the outer shell 1 , prevent deformation during lifting and transportation, and enhance the impact resistance.

[0042] For example Figures 2 to 4 As shown, in some embodiments, both ends of the upper shell 12 are provided with a latch 121 extending toward one side of the lower shell 11, and the inner side of the end surface of the lower shell 11 is provided with a latch groove 111 for the latch 121 to be inserted into. The latch 121 includes a steel plate and cork wrapped around the steel plate, which can not only ensure strength, but also play a role in buffering and shock absorption.

[0043] When the upper shell 12 is installed on the lower shell 11, the latch tongue 121 is inserted into the latch groove 111 to facilitate the positioning between the two. The end faces of the lower shell 11 and the upper shell 12 are both polygonal, and an octagonal prism structure is formed after assembly. The adjacent sides of the lower shell 11 and the upper shell 12 are respectively provided with flange edges that lock and connect the lower shell 11 and the upper shell 12 to each other. The edges of the upper shell 12 and the edges of the lower shell 11 are respectively provided with flange edges, which can lock and fix the upper shell 12 and the lower shell 11.

[0044] Both ends of the upper shell 12 are provided with a hoisting structure for hoisting, and the hoisting structure is provided with a first hoisting hole 125. A support leg is provided on the lower side of the lower shell 11, and the support leg is provided with a first hoisting hole 115 for hoisting. A forklift hole 116 is also provided on the lower side of the lower shell 11 for a forklift to insert and lift up. The hoisting holes and forklift holes 116 are provided in a variety of hoisting methods, making hoisting more convenient.

[0045] Combination Figures 2 to 6 As shown, preferably, a buffer structure 14 elastically connected to the lower shell 11 is provided on the side of the carrier 21, so that the carrier 21 is suspended in the lower shell 11. The suspension and elastic connection can reduce the external impact on the carrier 21. The buffer structure 14 can absorb the impact transmitted from the shell 1 to the carrier 21, avoiding the impact on the fuel assembly 3.

[0046] In some embodiments, the buffer structure 14 includes a plurality of buffer members 141 distributed on the side of the carrier 21 and connected to the lower shell 11. The buffer members 141 serve as shock absorbing devices to provide shock absorption and buffering for the fuel assembly to avoid impact. Generally, the buffer members 141 are distributed on the longitudinal side of the carrier 21, and the buffer members 141 can also be evenly distributed on each side.

[0047] The buffer 141 includes an elastic shock absorbing body 1411, and a top plate 1412 and a bottom plate 1413 disposed at two opposite ends of the shock absorbing body 1411. The top plate 1412 and the bottom plate 1413 are respectively provided with a first embedded portion 1414 and a second embedded portion 1415 embedded in the shock absorbing body 1411, and both the first embedded portion 1414 and the second embedded portion 1415 are provided with an undercut structure to prevent the shock absorbing body 1411 from falling off, so that the connection between the shock absorbing body 1411 and the top plate 1412 and the bottom plate 1413 is more secure.

[0048] The first embedded portion 1414 and the second embedded portion 1415 improve the shearing performance of the shock absorbing body 1411, reduce the deformation of the shock absorbing body 1411, and increase the service life.

[0049] The top plate 1412 and the bottom plate 1413 are connected to the inner wall of the support frame 21 and the lower shell 11 respectively, and are fixedly connected to the support frame 21 and the lower shell 11. The buffer body is sandwiched between the support frame 21 and the shell 1, which can play a role in buffering and preventing vibration. In other embodiments, the shock absorbing body 1411 can also be a spring, a spring sheet, or other structures.

[0050] The first embedded portion 1414 includes a first embedded section 1416 and a second embedded section 1417 which are connected in sequence. One end of the first embedded section 1416 away from the second embedded section 1417 is connected to the top plate 1412 , and the second embedded section 1417 forms an undercut to prevent it from falling off from the shock absorbing body 1411 .

[0051] In this embodiment, the first embedded section 1416 and the second embedded section 1417 are both cylindrical, and the cross-sectional shape of the second embedded section 1417 is larger than the cross-sectional shape of the first embedded section 1416, so that the step difference between the two sections forms an inverted buckle.

[0052] A connecting hole is provided in the middle of the shock absorbing body 1411, and the connecting hole includes a first hole section and a second hole section, and the cross-sectional dimension of the second hole section is larger than the cross-sectional dimension of the first hole section. The first embedded section 1416 is inserted in the first hole section, and the second embedded section 1417 is located in the second hole section and embedded in the inner wall surface of the second hole section.

[0053] A bolt is screwed in the middle of the top plate 1412, and the top plate 1412 can be connected to the support frame 21 by the bolt. Preferably, the first embedded section 1416, the second embedded section 1417, the first hole section, and the second hole section are coaxially arranged to facilitate assembly and positioning, and to make the force more balanced.

[0054] The connection hole is located in the middle of the shock absorbing body 1411 , and the connection hole allows the middle of the shock absorbing body 1411 to form a hollow structure, thereby reducing the weight of the shock absorbing body 1411 , saving materials, and improving the shock absorbing performance of the shock absorbing body 1411 .

[0055] A through hole corresponding to and communicating with the second hole segment is provided in the middle of the bottom plate 1413 so that the connecting hole is connected with the outside.

[0056] The second embedded portion 1415 includes a third embedded section 1418 and a fourth embedded section 1419 which are connected in sequence. The end of the third embedded section 1418 away from the fourth embedded section 1419 is connected to the bottom plate 1413 , and the fourth embedded section 1419 forms an undercut to prevent it from falling off from the shock absorbing body 1411 .

[0057] The third embedded section 1418 is cylindrical, and the fourth embedded section 1419 is conical. In other embodiments, the fourth embedded section 1419 may also be cylindrical, and the cross-sectional dimensions are different from those of the third embedded section 1418 to form an undercut structure.

[0058] The first embedded portion 1414 and the second embedded portion 1415 may also include a plurality of sheet-like structures distributed along the circumferential direction and embedded in the shock absorbing body 1411 , and the ends of the sheet-like structures are bent to form undercuts.

[0059] The top plate 1412 and the bottom plate 1413 respectively cover the end surfaces of the shock absorbing body 1411 to clamp the shock absorbing body 1411. A plurality of connecting holes are distributed on the bottom plate 1413, through which locking pieces are passed to connect and fix with the housing 1, so that it is easy to disassemble and assemble.

[0060] The top plate and the bottom plate are embedded in the shock absorbing body 1411, and the connection is more firmly established, which solves the connection problem between the shock absorbing body 1411 and the steel plate, and makes the connection between the steel top plate, the bottom plate and the rubber shock absorbing body 1411 more firmly established. At the same time, since a steel lining plate is embedded in the shock absorbing body 1411, the elasticity and shear performance of the shock absorbing body 1411 are further improved, thereby increasing the service life of the shock absorbing body 1411.

[0061] For example Figure 3 As shown, further, a support arm 23 is provided between the support assembly 22 and the carrier frame 21, which can support the support assembly 22 when the support assembly 22 is placed vertically to prevent the support assembly 22 from tilting during the process of loading the fuel assembly 3.

[0062] The support arm 23 is rotatably connected to the support assembly 22. The support frame 21 is provided with a guide rail 211 arranged along the longitudinal direction. The support arm 23 and the guide rail 211 are slidably matched. One end of the guide rail 211 is provided with a clamping structure for clamping and positioning the support arm 23.

[0063] The engaging structure includes an engaging member that can swing toward the upper side of the guide rail 211 , and an elastic member that provides elastic force to keep the engaging member located at the upper side of the guide rail 211 .

[0064] During the erection of the support assembly 22, the support arm 23 moves on the guide rail 211 to press the engaging member onto the guide rail 211. After the support assembly is erected, the support arm 23 is separated from the engaging member, and the engaging member is reset to the upper side of the guide rail 211. The engaging member blocks and engages the support arm 23, thereby positioning the support assembly 22 and preventing the support assembly 22 from turning downward. After the fuel assembly 3 is loaded into the support assembly 22, the engaging member is pressed down to the lower side of the guide rail 211 to release the resistance to the support arm 23, so that the support arm 23 can slide in the reverse direction through the engaging member and be received at the lower side of the support assembly 22.

[0065] Combination Figure 4 , Figure 5 and Figure 7As shown, in some embodiments, the support assembly 22 includes a bracket 223 and an outer cover plate 224, an inner cover plate 227, and a lower end cover 225 that together surround the cavity 4. Preferably, the bracket 223 extends along the longitudinal direction of the cavity 4, and the cross section of the bracket 223 is T-shaped, including a bottom wall 2231 and a side wall 2232 arranged on one side of the bottom wall 2231.

[0066] The outer cover plate 224, the inner cover plate 227 and the side wall 2232 are located on the same side of the bottom wall 2231. The outer cover plate 224 and the side wall 2232 are connected to the outer edge of the bottom wall 2231 and the two longitudinal edges of the bottom wall 2231. Two cavities 4 for accommodating the fuel assemblies 3 are defined on both sides of the side wall 2232. The portions of the outer cover plate 224 and the inner cover plate 227 corresponding to each cavity 4 are semicircular.

[0067] The arc-shaped outer cover plate 224 can improve the stress strength of the outer cover plate 224, making it more stable when encountering rollover or falling impact, and can avoid impact and protect the internal fuel assembly 3. The arc-shaped outer cover plate 224 has a compact structure and reduces the requirements for the external loading structure.

[0068] Preferably, an outer cover plate 224 is correspondingly disposed for each cavity 4 , and two sides of the arc-shaped outer cover plate 224 are connected to the outer edge of the side wall 2232 away from the bottom wall 2231 , and to a longitudinal edge of the bottom wall 2231 .

[0069] Meanwhile, the inner cover plate 227 is arranged in the angle formed by the bottom wall 2231 and the side wall 2232. Preferably, a support plate 228 for supporting the inner cover plate 227 is arranged in the angle between the bottom wall 2231 and the side wall 2232. The outer cover plate 224 and the inner cover plate 227 form a cylindrical structure, and define a cavity 4 for accommodating the fuel assembly 3 inside, supporting the fuel assembly 3 from both sides.

[0070] The longitudinal edge of the outer cover plate 224 is rotatably connected to the bottom wall 2231 and the side wall 2232 for easy assembly and disassembly. Preferably, one side of the outer cover plate 224 is rotatably connected to the longitudinal edge of the bottom wall 2231, and the outer cover plate 224 is detachably connected to the outer edge of the side wall 2232 away from the bottom wall 2231. After the outer cover plate 224 and the side wall 2232 are disassembled, the outer cover plate 224 is turned over to open the cavity.

[0071] The support assembly 22 has a simple structure, is easy to load and unload, and is convenient to operate. During the operation and maintenance process and the loading and unloading process of the fuel assembly, the complexity of the operation of the staff is reduced.

[0072] In order to load different numbers of fuel assemblies 3, the structure of the bracket 223 can be adjusted so that the number of cavities 4 on the support assembly 22 is adjusted accordingly. For example, only one set of outer cover plates 224 and inner cover plates 227 is provided to form one cavity 4.

[0073] Combination Figure 7 , Figure 8 , Fig. 9 As shown, a clamping structure 24 for clamping or loosening the fuel assembly in the cavity 4 is provided on the outer cover plate 224. After the fuel assembly is loaded into the cavity 4, the clamping structure 24 can clamp the fuel assembly in the cavity 4. When it needs to be taken out, the clamping structure 24 is loosened to allow the fuel assembly to escape.

[0074] In some embodiments, the pressing structure 24 includes an adjusting member 241 penetrating the outer cover plate 224, and a pressing member 242 located on the inner side of the outer cover plate 224 and connected to the adjusting member 241. The axial position of the adjusting member 241 is adjustable. Preferably, the adjusting member 241 is screwed to the outer cover plate 224 to drive the pressing member 242 to press or loosen the fuel assembly 3. The adjusting member 241 can also adjust the axial movement position driven by an external structure such as a motor.

[0075] The outer side of the outer cover plate 224 is provided with a semicircular arc-shaped support beam 2241 arranged in the circumferential direction. The support beam 2241 includes one or more beams to support the outer cover plate 224. When there are two or more support beams 2241, each support beam 2241 is arranged along the longitudinal direction of the cavity 4.

[0076] A support frame for positioning and supporting the outer wall of the fuel assembly 3 is provided on the inner side of the outer cover plate 224 , and a first support plate 2242 is provided on the side of the support frame opposite to the cavity 4 , and the first support plate 2242 can pre-position the fuel assembly 3 loaded into the cavity 4 .

[0077] The first support plate 2242 is provided with an escape opening for the pressing member 242 to move into the cavity 4. There is a certain space between the fuel assembly 3 and the first support plate 2242. The pressing member 242 can press the fuel assembly 3. Preferably, the width of the pressing member 242 is greater than the width of the spacer of the fuel assembly 3, so as to facilitate the pressing of the fuel assembly 3. During transportation, the transverse pressing member 242 is in direct contact with the fuel assembly grid and presses the surrounding of the fuel assembly. The main material is stainless steel, and a layer of rubber material with a certain elasticity is laid on the contact surface of the pressing member 242 with the grid.

[0078] The outer cover plate 224 is semicircular, and two support frames are distributed along the circumferential direction on the inner side of the outer cover plate 224, and each support frame is extended along the longitudinal direction of the cavity 4. Two mutually perpendicular positioning surfaces are formed on the inner side of the inner cover plate 227, and a second support plate 2243 is provided on the positioning surface. The two positioning surfaces and the two support frames form a square cavity 4, and position the two sides of the fuel assembly 3.

[0079] At least two groups of clamping structures 24 are arranged along the longitudinal direction of the cavity 4 in the area corresponding to each support frame and the outer cover plate 224. Preferably, the installation position of the clamping structure 24 corresponds to the position of the support beam 2241, so that the support beam 2241 provides support for the clamping structure to prevent deformation.

[0080] The first support plate 2242 includes a stacked aluminum stainless steel plate, a rubber plate, and a boron carbide plate. At the same time, the two positioning surfaces of the inner cover plate 227 are also covered with a second support plate 2243 made of the same material as the first support plate 2242. When the outer cover plate 224 is closed, the four aluminum-based boron carbide plates have an overall rectangular shape, which wraps around the fuel assembly but does not contact the fuel assembly, covering the entire length of the fuel assembly.

[0081] The aluminum-based boron carbide plate has stable radiation resistance and excellent thermal neutron absorption performance, which can maintain the subcritical state of the fuel assembly and avoid radioactive contamination to the external environment. The aluminum-based boron carbide plate covers the fuel assembly 3 from all sides. The full-cover design can well absorb the neutrons released by the fuel assembly 3, reduce the neutron escape space, and ensure safety. The full-cover design is resistant to high temperature and dust, is not easy to damage the fuel assembly 3, and has a long service life.

[0082] The outer cover plate 224 can be flipped open, which also solves the problem of difficulty in installing the neutron absorption plate due to limited space. The structure is relatively easy to clean compared to the traditional form, and is convenient for disassembly and assembly during maintenance.

[0083] Combination Figures 10 to 12 As shown, the lower end cover 225 is installed at one end of the support assembly 22 rotatably connected to the carrier frame 21 to seal the bottom end of the cavity 4 and serve as a bottom sealing device for the fuel assembly 3 transport container.

[0084] Preferably, the lower end cover 225 includes a lower cover body 2251 for sealing the bottom of the transport container, and a clamping device 2252 installed on the lower cover body 2251, and the lower cover body 2251 is detachably connected to the bracket 223 and the outer cover plate 224.

[0085] The clamping device 2252 is installed on the lower cover body 2251, which ensures the integrity of the edge of the lower cover body 2251, solves the sealing problem of the fuel assembly compartment, and ensures the airtightness of the fuel assembly compartment during transportation. The arc structure of the outer edge of the lower cover body 2251 improves safety, the fastening device is easy to operate, improves reliability, ensures the fastening of the fuel assembly base, and makes the lower cover body 2251 more evenly stressed when it is impacted. The clamping device 2252 can clamp the lower tube seat of the loaded fuel assembly, making the fuel assembly more stable during transportation. The clamping device 2252 is provided with a cam transmission mechanism, which further improves the simplicity and reliability of operation and makes processing simpler.

[0086] The clamping device 2252 includes a clamping mechanism 2253 and an operating mechanism 2254. The clamping mechanism 2253 includes a clamping member 2255 located on the inner side of the lower cover body 2251 and capable of reciprocating along the side of the lower cover body 2251 between a clamping position and a loosening position.

[0087] The operating mechanism 2254 includes an operating portion 2260 for driving the clamping member 2255 to move to the clamping position. When the clamping member 2255 is in the clamping position, it clamps the lower tube seat of the fuel assembly 3 in the transport container to prevent the fuel assembly 3 from rotating in the cavity 4.

[0088] The operating mechanism 2254 includes an operating rod 2256 , a cam plate 2257 , a pad 2258 and a fastening screw 2259 . The operating rod 2256 is rotatably disposed through the lower cover 2251 . The cam plate 2257 is installed at one end of the operating rod 2256 and rotates with the operating rod 2256 .

[0089] The other end of the joystick 2256 is provided with an operating portion 2260, which is used to drive the joystick 2256 to rotate after the tool is installed, and drives the cam plate 2257 to rotate when the joystick 2256 is rotated. In this embodiment, the operating portion 2260 is a square head, which is used to buckle with an operating wrench.

[0090] A key slot is provided at one end of the joystick 2256 for mounting the cam plate 2257 , in which a key is mounted. The cam plate 2257 is provided with a slot that engages with the key.

[0091] The cam plate 2257 is rotatably disposed on one side of the lower cover 2251, and the cam plate 2257 and the clamping member 2255 are located on the same side of the lower cover 2251. The edge of the cam plate 2257 is provided with a protrusion 2261 protruding outward, and the clamping member 2255 is located on the outer ring of the cam plate 2257, so that when the operating part 2260 drives the cam plate 2257 to rotate, the protrusion 2261 drives the clamping member 2255 to move to the clamping position.

[0092] Preferably, a plurality of protrusions 2261 are distributed along the circumferential direction on the edge of the cam plate 2257, and the clamping members 2255 are distributed along the circumferential direction on the outer ring of the cam plate and correspond to the positions of the protrusions 2261. When the cam plate 2257 rotates, the protrusions 2261 push the clamping members 2255 outward to move to the clamping position. The number of the clamping members 2255 can also be one, which clamps and fixes the lower tube seat of the fuel assembly 3.

[0093] Furthermore, the clamping member 2255 and the cam plate 2257 are arranged on the side of the backing plate 2258 opposite to the lower cover 2251, and the backing plate 2258 can move closer to or farther from the lower cover 2251, and the clamping member 2255 can slidably cooperate with the backing plate 2258. When the backing plate 2258 is away from the lower cover 2251, it can be pressed against the lower tube seat of the fuel assembly 3. When the backing plate 2258 is close to the lower cover 2251, it is loosened from the lower tube seat of the fuel assembly 3.

[0094] Preferably, the fastening screw 2259 is a hollow structure, the fastening screw 2259 is threadedly connected to the lower cover 2251, and the operating rod 2256 passes through the fastening screw 2259. The pad 2258 is installed at the end of the fastening screw 2259, and the fastening screw 2259 rotates on the lower cover 2251 to adjust the axial position, driving the pad 2258 and the clamping member 2255 to move closer to or away from the lower cover 2251.

[0095] In other embodiments, the rotation of the cam plate 2257 may be driven by a gear mechanism or the like, and the axial movement of the pad 2258 may also be driven by a piston rod or the like.

[0096] The clamping device 2252 further includes a plurality of reset members 2262 respectively abutting against each clamping member 2255 , and the reset members 2262 provide elastic force for the clamping member 2255 to move toward a released position.

[0097] The clamping mechanism 2253 also includes a baffle 2263 covering the clamping member 2255, and a clamping hole 2264 is provided on the baffle 2263 for the clamping member 2255 to extend after moving to the clamping position. The clamping members 2255 include four, which are distributed at the four inner corners of the baffle 2263. The baffle 2263 is connected to the pad 2258, and the clamping member 2255 is located in the space formed by the assembly of the baffle 2263 and the pad 2258. The baffle 2263 can protect the clamping member 2255, the reset member 2262 and the pad 2258 to prevent damage during the clamping process.

[0098] Furthermore, the end of the support assembly 22 opposite to the loading and unloading port is rotatably connected to the carrier 21, so that the support assembly 22 can be placed horizontally or erected. Preferably, the lower cover 2251 is provided with a rotating portion 2265 for the support assembly 22 to rotatably cooperate with the carrier 21. The rotating portion 2265 is usually a rotating shaft, or a rotating hole, or the rotating shaft and the rotating hole are provided at the same time, so as to ensure that the lower cover 2251 can rotatably cooperate with the carrier 21. In other embodiments, the bracket 223 can also be rotatably cooperated with the carrier 21.

[0099] Combination Fig.13 As shown, in some embodiments, the upper end cover 222 serves as a top cover device for the transport container of the fuel assembly 3, including a door panel for covering the upper end of the transport container cavity 4, and a locking structure installed on the door panel to axially lock the fuel assembly 3 in the transport container.

[0100] The number of door panels corresponds to the number of cavities 4, and each door panel is detachably connected to the bracket 223, and each door panel covers one of the cavities 4. After the fuel assembly 3 is loaded into one of the cavities 4, the loaded fuel assembly 3 can be sealed and covered separately. Of course, the upper end cover 222 can also be an integrated structure, which can open and close the loading and unloading ports corresponding to each cavity 4 at the same time.

[0101] Furthermore, each door panel is rotatably connected to the side wall 2232, and the locking structure 2222 on the door panel axially fixes the loaded fuel assembly 3. At the same time, each door panel is also rotatably connected to the bottom wall 2231, and the axis directions of the rotatable connection between the door panel and the side wall 2232 and the bottom wall 2231 are different, that is, they cannot rotate at the same time. In other embodiments, each door panel can also be rotatably connected to only one of the side wall 2232 and the bottom wall 2231.

[0102] Preferably, the locking structure includes a first locking rod 2222 and a second locking rod 2223 which are axially adjustable and mounted on the door panel. The first locking rod 2222 is located in the middle of the door panel and is opposite to the center of the upper tube seat of the fuel assembly 3. The second locking rod 2223 includes a plurality of rods which are centrally symmetrically arranged around the first locking rod 2222. The first locking rod 2222 and the second locking rod 2223 can be adjusted independently and can be used to compress fuel assemblies without related assemblies or fuel assemblies with related assemblies. The device is multifunctional, easy to operate, and simple to maintain.

[0103] The first locking rod 2222 and the second locking rod 2223 are respectively screwed to the door plate, and the axial position can be adjusted by rotation, so that the first locking rod 2222 and the second locking rod 2223 can tighten and fix the lower tube seat. The first locking rod 2222 and the second locking rod 2223 are screwed to the ends away from the transport container cavity 4 with adjusting nuts, and the adjusting nuts are rotated to drive the axial movement adjustment position of the first locking rod 2222 and the second locking rod 2223.

[0104] The ends of the first locking rod 2222 and the second locking rod 2223 opposite to the transport container cavity 4 are provided with soft buffer heads 2224, which can reduce the impact during fixation and prevent damage to the lower tube seat. Preferably, the buffer head 2224 is a soft rubber pad to avoid scratching the end surface of the fuel assembly and related components during use.

[0105] Furthermore, the ends of the first locking rod 2222 and the second locking rod 2223 opposite to the transport container cavity 4 are provided with a pressing block 2225, which can increase the pressing area and increase stability. The buffer head 2224 is installed on the side of the pressing block 2225 opposite to the cavity 4, and the buffer head 2224 is sleeved on the pressing block 2225.

[0106] A compression spring is distributed on the side of the upper tube seat of the fuel assembly 3 opposite to the door plate, and the second locking rod 2223 is opposite to the compression spring on the upper tube seat of the fuel assembly 3.

[0107] The top cover device comprises two door panels hinged to each other, each door panel is provided with a locking structure, and each door panel is respectively opposite to the position of the cavity 4 containing different fuel assemblies 3 in the transport container.

[0108] The locking structure 2222 includes a locking rod that is screwed on the locking hole and passes through the locking hole toward the cavity 4. A baffle is usually provided at the inner end of the locking rod. By adjusting the axial position of the locking rod and abutting against the fuel assembly 3, the fuel assembly 3 can be axially locked to prevent axial shaking.

[0109] In addition, if the fuel assemblies 3 are of different lengths, after being loaded into the cavity 4, the locking rods can be used to axially fix the fuel assemblies 3 of different lengths.

[0110] Correspondingly, a locking structure 2222 may also be provided on the lower cover 2251 to position the end of the fuel assembly 3 .

[0111] It can be understood that the above-mentioned technical features can be used in any combination without limitation.

[0112] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fuel assembly transport container, characterized in that: The invention comprises a top cover device, a housing, a support structure disposed in the housing, and the support structure comprises a support assembly; The top cover device is an upper end cover (222) installed on the loading and unloading opening of the support assembly (22); the support assembly (22) comprises a bracket (223) and an outer cover plate (224) and an inner cover plate (227) which together enclose a transport container cavity (4); the support assembly (22) can drive the fuel assembly (3) in the cavity (4) to be placed horizontally or to stand upright; the other end of the support assembly (22) is provided with a loading and unloading opening, and when the support assembly (22) is stood up, the loading and unloading opening is located at the upper end of the cavity (4), so that the fuel assembly (3) can be inserted axially from the loading and unloading opening into the cavity (4), or can be removed axially from the cavity (4) through the loading and unloading opening; The loading and unloading port is provided with the upper end cover (222) for sealing the cavity (4) and axially positioning the fuel assembly (3) in the cavity (4); after the fuel assembly (3) is placed in the cavity (4) and before the upper end cover (222) is sealed, the fuel assembly (3) is circumferentially positioned; after the upper end cover (222) is sealed, the fuel assembly (3) is axially positioned; The bracket (223) extends along the longitudinal direction of the cavity (4), and comprises a bottom wall (2231) and a side wall (2232) arranged on one side of the bottom wall (2231); The outer cover plate (224) and the inner cover plate (227) are both semicircular in shape; the inner cover plate (227) is arranged within the angle formed by the bottom wall (2231) and the side wall (2232); the outer cover plate (224) is connected to the outer edge of the side wall (2232) away from the bottom wall (2231) and to the longitudinal edge of the bottom wall (2231); the outer cover plate (224) and the inner cover plate (227) form a cylindrical structure and define a cavity (4) for accommodating the fuel assembly (3) inside; The outer cover plate (224) is provided with a pressing structure (24) for pressing or releasing the fuel assembly (3) in the cavity (4); the pressing structure (24) comprises an adjusting member (241) penetrating the outer cover plate (224), and a pressing member (242) located on the inner side of the outer cover plate (224) and connected to the adjusting member (241); the axial position of the adjusting member (241) is adjustable to drive the pressing member (242) to press or release the fuel assembly (3); A support frame for positioning and supporting the outer wall surface of the fuel assembly (3) is provided on the inner side of the outer cover plate (224); a first support plate (2242) is provided on the side of the support frame opposite to the cavity (4); a clearance opening for the pressing member (242) to move into the cavity (4) is provided on the first support plate (2242); and the width of the pressing member (242) is greater than the width of the spacer of the fuel assembly (3); two support frames are distributed along the circumferential direction on the inner side of the outer cover plate (224), and each support frame is extended along the longitudinal direction of the cavity; Two mutually perpendicular positioning surfaces are formed on the inner side of the inner cover plate (227), a second support plate (2243) is provided on the positioning surface, and the two positioning surfaces and the two support frames form a square cavity (4) for positioning two sides of the fuel assembly (3); The upper end cover (222) comprises a door plate used to cover the upper end of the transport container cavity, and a locking structure installed on the door plate to axially lock the fuel assembly (3) in the transport container; The locking structure comprises a first locking rod (2222) and a second locking rod (2223) which are axially adjustable and mounted on the door plate, the first locking rod (2222) being located in the middle of the door plate and opposite to the center of the upper tube seat of the fuel assembly (3), and the second locking rod (2223) comprising at least two rods which are centrally symmetrically arranged around the first locking rod (2222); The ends of the first locking rod (2222) and the second locking rod (2223) opposite to the transport container cavity (4) are provided with a soft buffer head (2224) and a pressing block (2225), and the buffer head (2224) is installed on a side of the pressing block (2225) opposite to the cavity (4); When the fuel assemblies (3) have different lengths, after being loaded into the cavity (4), the first locking rod (2222) and the second locking rod (2223) can be used to axially fix the fuel assemblies (3) of different lengths.

2. The fuel assembly transport container according to claim 1, characterized in that: The first locking rod (2222) and the second locking rod (2223) are respectively screwed to the door panel.

3. The fuel assembly transport container according to claim 2, characterized in that: An adjusting nut is threadedly connected to one end of the first locking rod (2222) and the second locking rod (2223) away from the transport container cavity (4).

4. The fuel assembly transport container according to claim 1, characterized in that: The buffer head (2224) is a soft rubber pad.

5. The fuel assembly transport container according to claim 1, characterized in that: The buffer head (2224) is sleeved onto the pressing block (2225).

6. The fuel assembly transport container according to any one of claims 1 to 5, characterized in that: A compression spring is distributed on the side of the upper tube seat of the fuel assembly opposite to the door plate, and the second locking rod (2223) is opposite to the compression spring on the upper tube seat of the fuel assembly.

7. The fuel assembly transport container according to any one of claims 1 to 5, characterized in that: The upper end cover (222) comprises two door panels hinged to each other, each of the door panels being provided with the locking structure, and each of the door panels being respectively opposite to the cavities (4) containing different fuel assemblies in the transport container.

Images