Fuel assembly connecting structure and fuel assembly

Abstract

The invention provides a fuel assembly connecting structure and a fuel assembly. The fuel assembly connecting structure comprises an upper pipe base, a connecting sleeve and a locking ring. The locking ring is arranged on the outer side wall of the connecting sleeve in a sleeving mode, a matched convex lug is arranged on the outer side wall of the locking ring in a protruding mode, a guide pipe hole and an assembly through groove which extend in the vertical direction are formed in the upper pipe base in a penetrating mode, and a groove opening of the assembly through groove is formed in the side wall of the guide pipe hole; the guide pipe hole is used for allowing the connecting sleeve and the locking ring to extend into or retreat from the upper pipe seat, and the assembly through groove is used for allowing the matching lug to extend into or retreat from the upper pipe seat; when the upper tube seat is disassembled, external force is applied to the locking ring to drive the locking ring to rotate reversely, so that the matching convex lug is relatively screwed out of the locking groove, the locking of the upper tube seat and the matching convex lug is relieved, namely the locking of the upper tube seat and the connecting sleeve is relieved, and the problem that the upper tube seat and the guide tube in the fuel assembly in the prior art are complex to disassemble and assemble is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of reactor fuel assemblies, and in particular relates to a fuel assembly connection structure and a fuel assembly. Background Art

[0002] In the design of existing fuel assemblies, the traditional method for the connection mechanism between the upper tube seat and the guide tube relies on the threaded connector being directly screwed into the guide tube hole. For example, a plurality of guide tube holes are provided through the upper tube seat, and each guide tube hole needs to be connected to its corresponding guide tube. The threaded connector is matched with the thread of the guide tube hole to establish the connection between the upper tube seat and the guide tube. Although the existing technology achieves the structural fastening of the upper tube seat and the guide tube, this method significantly increases the complexity and time-consuming nature of the disassembly and assembly process, posing a challenge to maintenance efficiency and operational convenience. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present application is to provide a fuel assembly connection structure and a fuel assembly, which can realize the convenience of connection and disassembly between the tube seat and the guide tube.

[0004] In order to solve the above problems, the present application provides a fuel assembly connection structure, including an upper tube seat, a connecting sleeve and a locking ring;

[0005] The locking ring is sleeved on the outer side wall of the connecting sleeve, and a matching lug is convexly provided on the outer side wall of the locking ring. The upper tube seat is respectively penetrated by a guide tube hole and an assembly groove extending in the vertical direction, and the notch of the assembly groove is opened on the side wall of the guide tube hole. The guide tube hole is used for allowing the connecting sleeve and the locking ring to extend into or withdraw from the upper tube seat, and the assembly groove is used for allowing the matching lug to extend into or withdraw from the upper tube seat.

[0006] Furthermore, a locking groove extending in the horizontal direction is provided on one side wall of the assembly through groove, and the locking ring rotates horizontally under the action of external force to drive the matching lug to embed into the locking groove to lock the upper tube seat.

[0007] Furthermore, the fuel assembly connection structure further comprises: an elastic member and a limiting plate;

[0008] The elastic member and the limiting plate are coaxially sleeved on the outer side wall of the connecting sleeve;

[0009] The limiting plate is fixed on the connecting sleeve, and a stop ring wall is protruding from the outer side wall of the end of the connecting sleeve. The two ends of the elastic member are respectively abutted against the limiting plate and the locking ring, and the end of the locking ring away from the elastic member is abutted against the stop ring wall.

[0010] Further, when the matching lug is aligned with the locking groove in the horizontal direction, the vertical lower end of the upper tube seat contacts the limiting plate.

[0011] Furthermore, the outer diameter of the stop ring is smaller than the outer diameter of the locking ring;

[0012] The outer diameter of the limiting plate is larger than the diameter of the guide tube hole;

[0013] A supporting ring wall is coaxially protruded on the end wall of the locking ring away from the elastic member, and the supporting ring wall is in contact with the stop ring wall.

[0014] Furthermore, a fixed ring wall is protruding from the limiting plate, the fixed ring wall extends into the guide tube hole, and one end of the elastic member away from the locking ring is coaxially sleeved on the outer side wall of the fixed ring wall.

[0015] Furthermore, a first hook is protruding from a side wall of the locking groove at a lower side in the vertical direction, and a second hook is protruding from a bottom wall of the matching lug, and the first hook selectively holds the second hook.

[0016] Furthermore, a gap is formed between the first hook and the end wall of the locking groove in the horizontal direction for the second hook to pass vertically downward, and a holding space is formed between the first hook and the side wall of the locking groove located below in the vertical direction for holding the second hook, and the opening direction of the holding space is away from the assembly groove.

[0017] Furthermore, the mating lugs are provided in plurality, and the plurality of mating lugs are evenly distributed on the outer side wall of the locking ring;

[0018] There are multiple assembly through grooves, and the multiple assembly through grooves are evenly distributed in the circumferential direction of the guide tube hole. The multiple assembly through grooves are used to respectively correspond to the multiple matching lugs.

[0019] Furthermore, a fuel assembly is provided, the fuel assembly comprising the above-mentioned connection structure of the fuel assembly.

[0020] Beneficial Effects

[0021] The fuel assembly connection structure provided by the present invention, when installing the upper tube seat, first align the locking ring and the connecting sleeve with the guide tube hole set on the upper tube seat, and align the matching lug with the assembly groove, then drive the locking ring to extend into the guide tube hole through the connecting sleeve, drive the matching lug to extend into the assembly groove, and stop when the matching lug extends into and aligns with the locking groove. After that, an external force is applied to the locking ring to drive the locking ring to rotate in the horizontal direction, so that the matching lug is screwed into the locking groove, and the upper tube seat and the matching lug are locked, that is, the upper tube seat and the connecting sleeve are locked. Compared with the prior art, when disassembling the upper tube seat, the present application applies an external force to the locking ring, drives the locking ring to rotate in the opposite direction, so that the matching lug is relatively screwed out of the locking groove, and the locking of the upper tube seat and the matching lug is released, that is, the locking of the upper tube seat and the connecting sleeve is released. It can be seen that the fuel assembly connection structure provided by the present invention has the characteristics of convenient disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the fuel assembly connection structure of an embodiment of the present application;

[0023] Figure 2 An exploded schematic diagram of a fuel assembly connection structure provided in an embodiment of the present application;

[0024] Figure 3 for Figure 2 A cross-sectional view of the middle upper tube seat;

[0025] Figure 4 for Figure 2 Schematic diagram of the connection structure between the middle connecting sleeve and the locking ring;

[0026] Figure 5 for Figure 2 Structural diagram of the middle locking ring;

[0027] Figure 6 for Figure 2 A schematic diagram of the structure of the middle connecting sleeve;

[0028] Figure 7 for Figure 2 Schematic diagram of the structure of the middle limit plate.

[0029] The reference numerals are as follows: 100, fuel assembly connection structure; 110, upper tube seat; 111, guide tube hole; 112, assembly through groove; 113, locking groove; 1131, first hook; 120, connecting sleeve; 121, stop ring wall; 130, locking ring; 131, matching lug; 1311, second hook; 132, abutting ring wall; 140, elastic member; 150, limit plate. DETAILED DESCRIPTION

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0034] See also Figures 1 to 7 As shown, according to an embodiment of the present application, a fuel assembly connection structure includes an upper tube seat 110, a connecting sleeve 120 and a locking ring 130; the locking ring 130 is sleeved on the outer wall of the connecting sleeve 120, and a matching lug 131 is convexly provided on the outer wall of the locking ring 130. The upper tube seat 110 is respectively penetrated by a guide tube hole 111 and an assembly groove 112 extending in a vertical direction, and the notch of the assembly groove 112 is opened on the side wall of the guide tube hole 111. The guide tube hole 111 is used for the connecting sleeve 120 and the locking ring 130 to extend into or withdraw from the upper tube seat 110, and the assembly groove 112 is used for the matching lug 131 to extend into or withdraw from the upper tube seat 110.

[0035] In this embodiment, a locking groove 113 extending in the horizontal direction is provided on one side wall of the assembly groove 112. Under the action of external force, the locking ring 130 rotates horizontally to drive the mating lug 131 to embed into the locking groove 113 to lock the upper tube seat 110. This application increases the stability of the connection between the upper tube seat 110 and the connecting sleeve 120.

[0036] In this embodiment, the notch of the locking groove 113 is formed on the side wall of the guide tube hole 111, which is equivalent to the locking groove 113 being recessed on the side wall of the guide tube hole 111, and one end of the locking groove 113 extends to the assembly through groove 112. In practical applications, the connecting sleeve 120 is aligned with the guide tube hole 111, and the matching lug 131 is aligned with the assembly through groove 112, and then the upper tube seat 110 is lowered, so that the connecting sleeve 120 drives the locking ring 130 and the matching lug 131 to extend into the upper tube seat 110. When the matching lug 131 is aligned with the locking groove 113 in the assembly through groove 112, the upper tube seat 110 is stopped from being lowered. Then, a horizontal force is applied to the locking ring 130 to rotate the locking ring 130 in the horizontal direction, so that the mating lug 131 is relatively screwed into the locking groove 113, and the side wall of the locking groove 113 realizes the locking limit of the mating lug 131, that is, the locking of the upper tube seat 110 and the connecting sleeve 120 is realized.

[0037] In this embodiment, when the upper tube seat 110 needs to be disassembled, a reverse force is applied to the locking ring 130 to rotate the locking ring 130 in the opposite direction, so that the mating lug 131 is relatively screwed out of the locking groove 113, that is, the relative locking between the upper tube seat 110 and the connecting sleeve 120 is released, and the upper tube seat 110 can be easily disassembled. Compared with the existing use of threaded connectors and the upper tube seat 110, the present application does not need to be rotated to a specific angle when disassembling and installing the upper tube seat 110. It is only necessary to rotate the locking ring 130 at any angle with the depth of the locking groove 113 as the maximum rotation stroke, and the disassembly and assembly process is convenient and quick.

[0038] In a possible implementation, Figure 3 and Figure 4As shown in the cross-sectional view of the upper tube seat 110 and the schematic diagram of the connection structure between the connecting sleeve 120 and the locking ring 130, in this embodiment, two assembly through grooves 112 are penetrated on the upper tube seat 110, and the two assembly through grooves 112 are symmetrically arranged with the axis of the guide tube hole 111 as the center, and the locking groove 113 is opened on one side wall of each of the two assembly through grooves 112, and the two locking grooves 113 are also symmetrically arranged with the axis of the guide tube hole 111 as the center.

[0039] In a possible implementation, Figure 5 As shown, two mating lugs 131 are symmetrically protruded on the outer wall of the locking ring 130, and the two mating lugs 131 correspond to the two assembly through grooves 112 and the two locking grooves 113 respectively. In actual application, when the connecting sleeve 120 drives the locking ring 130 to extend into the guide tube hole 111, the two mating lugs 131 slide along the two assembly through grooves 112 respectively, and stop when the two mating lugs 131 slide to align with the two locking grooves 113. At this time, by rotating the locking ring 130, the two mating lugs 131 can be synchronously rotated into the two locking grooves 113 respectively, so as to realize the locking of the upper tube seat 110 and the connecting sleeve 120.

[0040] In this embodiment, when it is necessary to disassemble the upper tube seat 110, a reverse force is applied to the locking ring 130 to cause the locking ring 130 to rotate in the opposite direction, so that the two mating lugs 131 are synchronously rotated out of the two locking grooves 113 relative to each other. When the two mating lugs 131 are screwed into their respective corresponding assembly through grooves 112, the relative locking between the upper tube seat 110 and the connecting sleeve 120 is released, thereby achieving easy disassembly of the upper tube seat 110.

[0041] It should be noted that, in other embodiments, the number of the assembly slots 112 and the number of the mating lugs 131 can be adaptively adjusted according to actual application conditions. For example, more than two mating lugs 131 can be evenly distributed on the outer wall of the locking ring 130, and a corresponding number of the assembly slots 112 can be set. The multiple assembly slots 112 can be evenly distributed around the guide tube hole 111, and the multiple assembly slots 112 are used to respectively cooperate with the multiple mating lugs 131.

[0042] In a feasible embodiment, in order to achieve reliable locking of the mating lug 131 and the locking groove 113, a first hook 1131 is protruded on the side wall at the bottom in the vertical direction of the locking groove 113, and a second hook 1311 is protruded on the bottom wall of the mating lug 131, and the first hook 1131 selectively holds the second hook 1311.

[0043] In this embodiment, in order to prevent the locking ring 130 from vibrating and causing the mating lug 131 to withdraw from the engagement with the first hook 1131 when the first hook 1131 and the second hook 1311 are engaged, in this embodiment, a gap is formed between the first hook 1131 and the end wall of the locking groove 113 in the horizontal direction for the second hook 1311 to pass vertically downward, and a holding space for holding the second hook 1311 is formed between the first hook 1131 and the side wall of the locking groove 113 located below in the vertical direction, and the opening direction of the holding space is away from the assembly through groove 112.

[0044] It can be seen that in this embodiment, when the first hook 1131 and the second hook 1311 are locked, the direction in which the mating lug 131 withdraws from the locking groove 113 is opposite to the direction in which the first hook 1131 disengages from the second hook 1311, that is, when the locking ring 130 is vibrated and has a movement tendency to withdraw from the locking groove 113, the first hook 1131 and the second hook 1311 cannot be separated smoothly, that is, the upper tube seat 110 and the connecting sleeve 120 can maintain a reliable locking state.

[0045] It is understandable that when the locking ring 130 rotates horizontally in the positive direction so that the mating lug 131 is relatively screwed into the locking groove 113, the first hook 1131 and the second hook 1311 are misaligned in the horizontal direction, that is, they are not in the same plane, so the first hook 1131 and the second hook 1311 cannot complete the clamping. In this case, the second hook 1311 needs to be vertically moved downward by a certain distance relative to the first hook 1131 so that the second hook 1311 passes through the gap formed between the first hook 1131 and the end wall of the locking groove 113, so that the second hook 1311 can be aligned with the first hook 1131 in the horizontal direction. When the first hook 1131 and the second hook 1311 are relative to each other in the horizontal direction, the locking ring 130 rotates horizontally in the reverse direction to drive the first hook 1131 and the second hook 1311 to complete the clamping.

[0046] In a feasible implementation, in order to ensure the reliability of the clamping state, the fuel assembly connection structure further includes: an elastic member 140 and a limiting plate 150; the elastic member 140 and the limiting plate 150 are both coaxially sleeved on the outer wall of the connecting sleeve 120; the limiting plate 150 is fixed to the connecting sleeve 120, and the outer wall of the end of the connecting sleeve 120 is convexly provided with a stop ring wall 121, and the two ends of the elastic member 140 are respectively abutted against the limiting plate 150 and the locking ring 130, and the end of the locking ring 130 away from the elastic member 140 is abutted against the stop ring wall 121. The design of this application introduces the elastic member 140 and the limiting plate 150, which further enhances the stability of the connection. The elastic member 140 provides additional pressure to ensure that the locking ring 130 can fit tightly on the upper tube seat 110, while the limiting plate 150 limits the upward movement of the connecting sleeve 120 and the locking ring, thereby improving the stability of the entire connecting structure.

[0047] In this embodiment, the elastic member 140 is a spring, which always holds the locking ring 130 against the stop ring wall 121 of the connecting sleeve 120. When the matching lug 131 is screwed into the locking groove 113 and the first hook 1131 and the second hook 1311 are not aligned in the horizontal direction, an axial force is applied to the locking ring 130 to drive the locking ring 130 to slide toward the limit plate 150. During this process, the spring is compressed until the first hook 1131 and the second hook 1311 are aligned in the horizontal direction. At this time, the locking ring 130 is rotated in the opposite direction horizontally to complete the clamping of the first hook 1131 and the second hook 1311. After the clamping is completed, the external force is removed, and the elastic force of the spring acts on the locking ring 130 to ensure that the first hook 1131 and the second hook 1311 are firmly clamped. When the upper tube seat 110 needs to be disassembled, the locking ring 130 is first rotated in a positive horizontal direction to disengage the first hook 1131 and the second hook 1311, and the second hook 1311 is rotated to the gap between the first hook 1131 and the end wall of the locking groove 113. At this time, the second hook 1311 is subjected to the force of the spring and vertically passes through the gap between the first hook 1131 and the end wall of the locking groove 113, that is, the first hook 1131 and the second hook 1311 are misaligned in the horizontal direction. Afterwards, the locking ring 130 is rotated in a reverse horizontal direction to allow the mating lug 131 to smoothly rotate out of the locking groove 113 and enter the assembly through groove 112, thereby smoothly releasing the lock between the upper tube seat 110 and the connecting sleeve 120.

[0048] It should be noted that, in another feasible implementation manner, the locking ring 130 and the connecting sleeve 120 may be connected in other ways. For example, the locking ring 130 may be coaxially welded on the outer wall of the connecting sleeve 120, or may even be an integrally formed structure with the connecting sleeve 120.

[0049] In this embodiment, in fact, the limiting plate 150 not only supports the elastic member 140, but also supports and limits the upper tube seat 110. When the matching lug 131 is aligned with the locking groove 113 in the horizontal direction, the vertical lower end of the upper tube seat 110 contacts the limiting plate 150. This design of the present application ensures that before the upper tube seat 110 is properly installed and locked, the limiting plate 150 can provide a physical stop to prevent the upper tube seat 110 from being over-inserted or damaged. That is, through the axial position of the preset locking groove 113 in the assembly through groove 112 and the distance between the matching lug 131 and the limiting plate 150, it can be ensured that when the connecting sleeve 120 drives the locking ring 130 to extend into the guide tube hole 111 until one end of the upper tube seat 110 contacts the limiting plate 150, the matching lug 131 is just aligned with the locking groove 113 in the horizontal direction.

[0050] It is understandable that, in order to facilitate the application of axial external force to the locking ring 130, the stop ring wall 121 provided on the connecting sleeve 120 needs to give way to the locking ring 130, so the outer diameter of the stop ring wall 121 is smaller than the outer diameter of the locking ring 130. In addition, the limiting plate 150 is to support the upper tube seat 110, so the outer diameter of the limiting plate 150 is larger than the diameter of the guide tube hole 111.

[0051] In addition, in this embodiment, in order to achieve control of the axial dimension, the end wall of the locking ring 130 away from the elastic member 140 is coaxially convexly provided with the abutting ring wall 132, and the abutting ring wall 132 abuts against the stop ring wall 121. In different embodiments, the height of the abutting ring wall 132 can be adjusted according to different actual needs, so as to ensure that the matching lug 131 can be closely matched with the locking groove 113.

[0052] In a feasible implementation, in order to achieve reliable fixation of the elastic member 140, a fixed ring wall is protruded on the limit plate 150, and the fixed ring wall extends into the guide tube hole 111. The end of the elastic member 140 away from the locking ring 130 is coaxially sleeved on the outer wall of the fixed ring wall.

[0053] In this embodiment, when the matching lug 131 is aligned with the locking groove 113 in the horizontal direction, the vertical lower end of the upper tube seat 110 contacts the limiting plate 150 .

[0054] In a feasible embodiment, the mating lugs 131 are multiple, and the multiple mating lugs 131 are evenly distributed on the outer wall of the locking ring 130; the number of the assembly grooves 112 is multiple, and the multiple assembly grooves 112 are evenly distributed circumferentially of the guide tube hole 111, and the multiple assembly grooves 112 are used to respectively correspond to the multiple mating lugs 131.

[0055] In summary, in the fuel assembly connection structure 100 provided in this embodiment, the upper tube seat 110 can be conveniently and quickly disassembled and assembled with the connection sleeve 120, and the structure is simple, saving time and effort.

[0056] In addition, this embodiment provides a fuel assembly, including the aforementioned fuel assembly connection structure 100. Therefore, the fuel assembly has the characteristic of being easy to disassemble and assemble.

[0057] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0058] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A fuel assembly connection structure, characterized in that: It comprises an upper pipe seat (110), a connecting sleeve (120) and a locking ring (130); The locking ring (130) is sleeved on the outer wall of the connecting sleeve (120), and a matching lug (131) is convexly provided on the outer wall of the locking ring (130). The upper tube seat (110) is respectively penetrated by a guide tube hole (111) and an assembly groove (112) extending in a vertical direction, and the notch of the assembly groove (112) is opened on the side wall of the guide tube hole (111). The guide tube hole (111) is used for allowing the connecting sleeve (120) and the locking ring (130) to extend into or out of the upper tube seat (110), and the assembly groove (112) is used for allowing the matching lug (131) to extend into or out of the upper tube seat (110).

2. The fuel assembly connection structure according to claim 1, characterized in that: A locking groove (113) extending in the horizontal direction is provided on one side wall of the assembly through groove (112); under the action of an external force, the locking ring (130) rotates in the horizontal direction to drive the matching lug (131) to be embedded in the locking groove (113) to lock the upper tube seat (110).

3. The fuel assembly connection structure according to claim 2, characterized in that: Also includes: An elastic member (140) and a limiting plate (150); The elastic member (140) and the limiting plate (150) are both coaxially sleeved on the outer side wall of the connecting sleeve (120); The limiting plate (150) is fixed on the connecting sleeve (120); a stop ring wall (121) is protrudingly provided on the outer side wall of the end of the connecting sleeve (120); the two ends of the elastic member (140) respectively abut against the limiting plate (150) and the locking ring (130); and one end of the locking ring (130) away from the elastic member (140) abuts against the stop ring wall (121).

4. The fuel assembly connection structure according to claim 3, characterized in that: When the matching lug (131) and the locking groove (113) are aligned in the horizontal direction, the vertical lower end of the upper tube seat (110) contacts the limiting plate (150).

5. The fuel assembly connection structure according to claim 3, characterized in that: The outer diameter of the stop ring wall (121) is smaller than the outer diameter of the locking ring (130); The outer diameter of the limiting plate (150) is greater than the diameter of the guide tube hole (111); A supporting ring wall (132) is coaxially protruded on the end wall of the locking ring (130) at one end away from the elastic member (140), and the supporting ring wall (132) is in contact with the stop ring wall (121).

6. The fuel assembly connection structure according to claim 5, characterized in that: A fixed ring wall is protruding from the limiting plate (150), and the fixed ring wall extends into the guide tube hole (111). One end of the elastic member (140) away from the locking ring (130) is coaxially sleeved on the outer side wall of the fixed ring wall.

7. The fuel assembly connection structure according to claim 4, characterized in that: A first hook (1131) is convexly provided on the side wall of the locking groove (113) located at the bottom in the vertical direction, and a second hook (1311) is convexly provided on the bottom wall of the matching lug (131), and the first hook (1131) selectively holds the second hook (1311).

8. The fuel assembly connection structure according to claim 7, characterized in that: A gap is formed between the first hook (1131) and the end wall of the locking groove (113) in the horizontal direction for the second hook (1311) to pass vertically downward, and a holding space is formed between the first hook (1131) and the side wall of the locking groove (113) located below in the vertical direction for holding the second hook (1311), and the opening direction of the holding space is away from the assembly groove (112).

9. The fuel assembly connection structure according to any one of claims 1 to 8, characterized in that: A plurality of the matching lugs (131) are provided, and the plurality of matching lugs (131) are evenly distributed on the outer side wall of the locking ring (130); The number of the assembly through grooves (112) is multiple, and the multiple assembly through grooves (112) are evenly distributed in the circumferential direction of the guide tube hole (111). The multiple assembly through grooves (112) are used to respectively and correspondingly cooperate with the multiple matching lugs (131).

10. A fuel assembly, characterized in that: A connection structure comprising a fuel assembly as claimed in any one of claims 1 to 9.

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