Connecting structure and fuel assembly

Abstract

The invention provides a connecting structure and a fuel assembly, the connecting structure is used for fixing a to-be-fixed object and a carrier, the connecting structure comprises a fixing piece and a locking piece, the to-be-fixed object and the fixing piece are relatively fixed, a through hole is formed in the carrier, the fixing piece is used for being arranged in the through hole in a penetrating mode, and the locking piece is used for locking the fixing piece. The locking piece is rotatably arranged at the end, away from the to-be-fixed object, of the fixing piece, the rotating path of the locking piece comprises a locking position, and under the condition that the locking piece rotates to the locking position, the locking piece penetrates through the carrier through the through hole and abuts against the upper surface of the carrier. Therefore, during installation, fixing can be completed only by penetrating the fixing piece into the through hole and then rotating the locking piece to the locking position, and operation is simple and rapid. When disassembly is needed, the fixing piece can be easily taken out only by rotating the locking piece to the unlocking position, rapid disassembly is achieved, operation time is greatly saved, and the requirement for rapid disassembly is met.

Description

Technical Field

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

[0002] In many industrial and technological fields, reliable connection structures are essential to ensure the stable combination of various components and the normal operation of the overall system. In application scenarios such as fuel assemblies, a connection structure that can firmly fix the guide tube and the upper tube seat is required to meet the high requirements in complex working environments.

[0003] At present, the connection structure between the nuclear fuel assembly tube seat and the guide tube usually adopts a threaded connection, and an expansion joint structure is used to prevent the threaded connection from loosening. However, this connection structure is extremely complicated during disassembly and reassembly operations, consumes a lot of time, and is difficult to achieve the requirement of rapid disassembly. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present application is to provide a connection structure and a fuel assembly, which can realize the rapid disassembly and assembly of the guide tube by rotating the locking piece, thereby saving operation time and improving assembly efficiency.

[0005] In order to solve the above-mentioned problems, on the one hand, the present application provides a connection structure for fixing an object to be fixed and a carrier, the connection structure including a fixing piece and a locking piece, the object to be fixed and the fixing piece are relatively fixed, a through hole is provided on the carrier, the fixing piece is used to be inserted into the through hole, the locking piece is rotatably provided at an end of the fixing piece away from the object to be fixed, the rotation path of the locking piece includes a locking position, when the locking piece is rotated to the locking position, the locking piece passes through the carrier through the through hole and abuts against the upper surface of the carrier.

[0006] Optionally, the fixing member includes a stop portion, a connecting portion and a clamping portion, the stop portion and the clamping portion are arranged along the extension direction of the connecting portion, the connecting portion is used to be inserted into the through hole, and a clamping space for locking the locking member and the carrier is formed between the stop portion and the clamping portion.

[0007] Optionally, the stop portion includes a limiting portion and a locking portion, the limiting portion is connected to the connecting portion, the locking portion is arranged on the limiting portion and is sleeved outside the connecting portion, the locking portion is an elastic structure, and the locking portion is used to abut against the locking piece and lock the locking piece when compressed.

[0008] Optionally, the locking portion includes a spring and a limit block, both of which are mounted on the connecting portion, the spring is located between the limit portion and the limit block, and the limit block is used to limit the locking member in the circumferential direction of the locking member.

[0009] Optionally, limiting columns are provided at four corners of the limiting block close to one side of the locking member, and when the locking member is rotated to the locking position, a corner of the locking member is located between two adjacent limiting columns.

[0010] Optionally, the height of the limiting column is greater than the thickness of the locking piece.

[0011] Optionally, a chamfered structure is provided on the top of the limiting column, and at least a part of the chamfered structure is an inclined surface. When the locking member applies a force to the inclined surface, the limiting column moves in a direction away from the locking member.

[0012] Optionally, a limiting groove is provided on the carrier at a position relative to the limiting portion, and the limiting groove is used to accommodate at least a portion of the limiting portion.

[0013] In another aspect of the present application, a fuel assembly is provided, comprising a connection structure as described above.

[0014] Beneficial Effects

[0015] The connection structure and fuel assembly provided in the embodiment of the present invention can be installed by inserting the fixing member into the through hole and then rotating the locking member to the locking position to complete the fixing, which is simple and quick to operate. When disassembly is required, the fixing member can be easily removed by rotating the locking member to the unlocking position, thereby realizing quick disassembly, greatly saving operation time and meeting the requirement of quick disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of a connection structure of an optional embodiment of the present application in the assembly process;

[0017] Figure 2 for Figure 1 A schematic diagram of the structure of the fixing member and the locking member of the illustrated embodiment;

[0018] Figure 3 for Figure 1 A top view of the connection structure of the illustrated embodiment;

[0019] Figure 4 This is a structural schematic diagram of a connection structure of an optional embodiment of the present application in an assembled state;

[0020] Figure 5 for Figure 4A schematic diagram of the structure of the fixing member and the locking member of the illustrated embodiment;

[0021] Figure 6 for Figure 4 A top view of the connection structure of the illustrated embodiment;

[0022] Figure 7 for Figure 4 A schematic diagram of the structure of the upper surface of the carrier of the illustrated embodiment;

[0023] Figure 8 This is a schematic structural diagram of a locking member of an optional embodiment of the present application;

[0024] Fig. 9 This is a schematic structural diagram of a limit block of an optional embodiment of the present application.

[0025] The reference numerals are:

[0026] 1. Fixing member; 11. Stopping portion; 111. Limiting portion; 112. Locking portion; 1121. Spring; 1122. Limiting block; 11221. Limiting column; 11222. Chamfering structure; 12. Connecting portion; 13. Clamping portion; 2. Locking member; 3. Object to be fixed; 4. Carrier; 41. Through hole; 42. Limiting groove. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] See also Figures 1 to 9 As shown, an embodiment of the first aspect of the present application provides a connection structure for fixing an object to be fixed 3 and a carrier 4, the connection structure includes a fixing member 1 and a locking member 2, the object to be fixed 3 is relatively fixed to the fixing member 1, a through hole 41 is provided on the carrier 4, the fixing member 1 is used to be inserted into the through hole 41, the locking member 2 is rotatably arranged at one end of the fixing member 1 away from the object to be fixed 3, the rotation path of the locking member 2 includes a locking position, when the locking member 2 is rotated to the locking position, the locking member 2 passes through the carrier 4 through the through hole 41 and abuts against the upper surface of the carrier 4.

[0032] By setting the locking member 2 to be rotatable, during installation, it is only necessary to insert the fixing member 1 into the through hole 41, and then rotate the locking member 2 to the locking position to complete the fixing, which is simple and quick to operate. When disassembly is required, it is also only necessary to rotate the locking member 2 to the unlocking position to easily remove the fixing member 1, thereby achieving quick disassembly, greatly saving operation time, and meeting the requirements for quick disassembly. At the same time, through the cooperation between the fixing member 1 and the locking member 2, the object 3 to be fixed can be firmly fixed on the carrier 4. When the locking member 2 is rotated to the locking position, it abuts against the upper surface of the carrier 4, providing a stable supporting force from above, preventing the object 3 to be fixed from moving in the vertical direction, and ensuring the firmness of the connection. At the same time, the above-mentioned connection structure can be applied to objects 3 to be fixed and carriers 4 of different shapes and sizes, and has broad application prospects in various industrial and technical fields.

[0033] The carrier 4 can be the upper tube seat of the fuel assembly, or the upper tube seat mounting sheet metal of the fuel assembly, etc., which can provide a fixed position for the object to be fixed 3, and this application does not limit this. The object to be fixed 3 can be a guide tube, etc., and this application does not limit the type of the object to be fixed 3.

[0034] The through hole 41 is a straight hole penetrating the carrier 4 , providing a passage for the fixing member 1 to pass through.

[0035] The fixing member 1 is in the shape of an elongated strip or a structure of a certain length, and has two ends, namely a first end and a second end.

[0036] The first end of the fixing member 1 is an end close to the object to be fixed 3. This end is relatively fixed to the object to be fixed 3, and a firm connection can be achieved by welding, bolt connection, clamping, etc.

[0037] The second end of the fixing member 1 is the end away from the object to be fixed 3. A rotatable locking member 2 is provided at this end, and the locking member 2 can be rotated relative to the fixing member 1 by means of hinge connection, sleeve connection, spherical joint connection, cam connection, etc.

[0038] Among them, the cross-sectional shape of the locking piece 2 is the same as the cross-sectional shape of the through hole 41. On the one hand, it ensures that when the fixing piece 1 penetrates the through hole 41, the locking piece 2 can enter the through hole 41 synchronously with it. On the other hand, when the locking piece 2 extends out of the upper surface of the carrier 4 and rotates, it can fit tightly with the upper surface of the carrier 4, thereby limiting the downward movement of the fixing piece 1.

[0039] The cross-sectional shape of the locking member 2 is a polygon, such as a triangle, a quadrilateral, a pentagon, a hexagon, etc. It can be understood that if the cross-sectional shape of the locking member 2 is a polygon, such as a hexagon, then the cross-sectional shape of the through hole 41 on the carrier 4 is also a hexagon, and when the locking member 2 extends out of the upper surface of the carrier 4 and rotates, each side and corner of the hexagon can be in close contact with the upper surface of the carrier 4 to provide a stable supporting force.

[0040] Specifically, in practical applications, see Figure 1 , Figure 4 and Figure 7 As shown, when the object 3 to be fixed needs to be fixed on the carrier 4, the fixing member 1 is first inserted into the through hole 41 on the carrier 4 to make the object 3 to be fixed close to the carrier 4, and then the fixing member 1 is continued to be moved to make the locking member 2 extend out of the upper surface of the carrier 4, and then the locking member 2 is rotated to the locking position to make it closely abut against the upper surface of the carrier 4. At this time, due to the blocking effect of the locking member 2, the fixing member 1 cannot move downward, thereby achieving a firm fixation of the object 3 to be fixed on the carrier 4.

[0041] When the locking member 2 is rotated to the locking position, Figure 6 and Figure 7 As shown, at least a portion of the orthographic projection of the locking member 2 on the carrier 4 is separated from the through hole 41 .

[0042] The rotation path of the locking member 2 also includes an unlocking position, see Figure 3 As shown, when the locking member 2 is rotated to the unlocking position, the orthographic projection of the locking member 2 on the carrier 4 completely coincides with the through hole 41 .

[0043] Specifically, in practical applications, when it is necessary to separate the object 3 to be fixed from the carrier 4, the position of the locking member 2 is first determined. If the locking member 2 is not in the unlocked position, it is rotated to the unlocked position so that the orthographic projection of the locking member 2 on the carrier 4 completely coincides with the through hole 41. At this point, the fixing member 1 can be easily pulled out of the through hole 41 of the carrier 4, thereby achieving separation of the object 3 to be fixed from the carrier 4.

[0044] In some possible implementations disclosed in this application, see Figure 4 As shown, the fixing member 1 includes a stop portion 11, a connecting portion 12 and a clamping portion 13. The stop portion 11 and the clamping portion 13 are arranged along the extension direction of the connecting portion 12. The connecting portion 12 is used to be inserted into the through hole 41. A clamping space for locking the locking member 2 and the carrier 4 is formed between the stop portion 11 and the clamping portion 13.

[0045] By providing the stopper 11 and the clamping part 13, and forming a clamping space for locking the locking member 2 and the carrier 4 between the stopper 11 and the clamping part 13, the carrier 4 can be clamped and fixed from both the upper and lower directions. Since the position of the carrier 4 is fixed, the movement of the object 3 to be fixed in the vertical direction can be effectively prevented, which greatly improves the stability and firmness of the connection. At the same time, by providing the connecting part 12, the stopper 11 and the clamping part 13 are connected as a whole, ensuring good overall strength. At the same time, the connecting part 12 is penetrated in the through hole 41, providing stable support and guidance for the entire connection structure, ensuring that the fixing member 1 will not deviate or shake during use, and further enhancing the reliability of the connection.

[0046] The connecting portion 12 may be a hollow cylindrical shape with both ends open to form a channel for the fuel rod to pass through.

[0047] The fixing member 1 is relatively fixed to the object 3 to be fixed, and specifically, the connecting portion 12 is relatively fixed to the object 3 to be fixed.

[0048] The connecting portion 12 is in the shape of a long strip or a structure with a certain length, and has two ends, namely a first end and a second end.

[0049] The first end of the connecting portion 12 is an end close to the object to be fixed 3 , and a stopper 11 is provided at this end.

[0050] The second end of the connecting portion 12 is an end away from the object to be fixed 3 , and a clamping portion 13 is provided at this end.

[0051] Specifically, in actual application, after the connection structure and the carrier 4 are assembled, the stopper 11 is tightly fitted to the lower surface of the carrier 4, and the clamping portion 13 is in contact with the upper surface of the locking member 2, so that the carrier 4 and the locking member 2 between the stopper 11 and the clamping portion 13 are in a firmly clamped state. In this case, since the position of the carrier 4 is fixed, the stopper 11 and the clamping portion 13 used to clamp the carrier 4 and the locking member 2 are also locked, and accordingly, the connection portion 12 and the object to be fixed 3 are also locked in a stable state. It should be noted that in various working environments, whether it is subjected to slight vibration or large external force impact, the connection structure can maintain its stability to ensure that the object to be fixed 3 is always firmly fixed on the carrier 4.

[0052] The clamping portion 13 may be an annular protrusion extending radially on the connecting portion 12 , and the diameter of the annular protrusion is greater than the inner diameter of the locking portion.

[0053] Among them, the stopper 11 can be composed of two parts, one of which is attached to the lower surface of the carrier 4, and the part is an annular boss extending radially on the connecting part 12, and the length of this annular boss in the radial direction of the connecting part 12 is greater than the length of the through hole 41 in the radial direction of the connecting part 12.

[0054] In the above embodiments, see Figure 4 and Figure 5 As shown, the stop portion 11 includes a limiting portion 111 and a locking portion 112. The limiting portion 111 is connected to the connecting portion 12. The locking portion 112 is arranged on the limiting portion 111 and sleeved outside the connecting portion 12. The locking portion 112 is an elastic structure. The locking portion 112 is used to abut against the locking member 2 and lock the locking member 2 when compressed.

[0055] By providing the limiting portion 111, support can be provided for the locking portion 112, thereby limiting the locking portion 112 on the limiting portion 111. By providing the locking portion 112 and compressing the locking portion 112 between the locking member 2 and the limiting portion 111, an elastic force can be applied to the locking member 2, tightly locking the locking member 2, effectively preventing the locking member 2 from accidentally rotating or loosening during use, ensuring that the connection structure is always in a locked state, and improving the reliability of the connection structure. At the same time, during the assembly process, due to the elasticity of the locking portion 112, it can provide guidance and buffering for the locking member 2, so that the operator can more easily insert the fixing member 1 into the through hole 41, thereby improving the smoothness of the assembly process.

[0056] After the connection structure and the carrier 4 are assembled, the limiting portion 111 is tightly attached to the lower surface of the carrier 4 .

[0057] Specifically, the limiting portion 111 is a disc-shaped structure extending radially from the connecting portion 12 to support the locking portion 112 .

[0058] The locking portion 112 is located between the limiting portion 111 and the locking member 2 , and is sleeved on the connecting portion 12 .

[0059] Specifically, one end of the locking portion 112 can abut against the outer wall of the limiting portion 111 on the side close to the carrier 4 or be connected thereto by welding, while the other end of the locking portion 112 can abut against the outer wall of the locking member 2 on the side close to the limiting portion 111 or be connected thereto by welding.

[0060] Among them, in actual application, the locking portion 112 is in a compressed state, that is, the locking portion 112 can continuously provide a stable upward supporting force for the locking member 2 during use. It should be noted that this upward supporting force forms an effective match with the clamping portion 13, further enhancing the locking effect of the locking member 2. The clamping portion 13 is an annular protrusion extending radially on the connecting portion 12, which blocks the locking member 2 from above. When the locking member 2 rotates to the locking position, the clamping portion 13 is in close contact with the upper surface of the locking member 2 to prevent the locking member 2 from moving upward. At this time, the locking portion 112 in a compressed state applies an upward supporting force to the locking member 2 from below, so that the locking member 2 is firmly clamped between the clamping portion 13 and the locking portion 112.

[0061] For some specific examples, see Figure 5 As shown, the locking portion 112 includes a spring 1121 and a limit block 1122, both of which are sleeved on the connecting portion 12, the spring 1121 is located between the limit portion 111 and the limit block 1122, and the limit block 1122 is used to limit the locking member 2 in the circumferential direction of the locking member 2.

[0062] It should be noted that the elastic action of the spring 1121 enables the limit block 1122 to fit tightly on the locking member 2, providing continuous pressure to the locking member 2. This pressure forms an effective limit in the circumferential direction of the locking member 2, preventing the locking member 2 from accidentally rotating in the circumferential direction. Even in the case of external vibration or impact, the limit block 1122 can maintain a stable limit on the locking member 2 under the action of the spring 1121, ensuring that the connection structure is always in a locked state, greatly improving the reliability of the connection.

[0063] Furthermore, when the position of the locking member 2 needs to be adjusted during use, the structure of the spring 1121 and the limit block 1122 also makes the operation more convenient. It is only necessary to apply a certain external force to overcome the elastic force of the spring 1121, so as to separate the limit block 1122 from the locking member 2, and then make corresponding adjustments. After the adjustment is completed, the spring 1121 will push the limit block 1122 again to limit the locking member 2, thereby ensuring the stability of the connection structure.

[0064] The spring 1121 is sleeved on the connecting portion 12 and is located between the limiting portion 111 and the limiting block 1122 .

[0065] Specifically, the spring 1121 is elastic and can store and release energy. In the connection structure, the spring 1121 can be compressed to generate elastic force to provide continuous pressure for the limit block 1122.

[0066] The limiting block 1122 is also sleeved on the connecting portion 12. The limiting block 1122 is mainly used to limit the locking member 2 in the circumferential direction of the locking member 2. The circumferential direction is the direction around the axis of the connecting portion 12. When the locking member 2 is in the locked position, the limiting block 1122 is tightly attached to the side of the locking member 2 under the action of the spring 1121 to prevent the locking member 2 from rotating in the circumferential direction.

[0067] The stopper 1122 may be a block structure, and its outer surface is adapted to the shape of the circumferential surface of the locking member 2. For example, if the locking member 2 is a polygon, the outer surface of the stopper 1122 is also designed to be a part of the polygon, and can fit tightly with the side of the locking member 2.

[0068] Specifically, when the locking piece 2 is a polygon, each side of the limit block 1122 can contact the corresponding side of the locking piece 2 to form multiple support points, thereby increasing the stability of the limit. At the same time, this tightly fitting design can also reduce the gap between the locking piece 2 and the limit block 1122 to avoid shaking or loosening during use. In addition, for polygonal locking pieces 2 with different numbers of sides, the design of the limit block 1122 can be adjusted according to its specific shape and size. For example, for a triangular locking piece 2, the limit block 1122 can be designed as a block structure with three sides, each side being in contact with one side of the locking piece 2; for a quadrilateral locking piece 2, the limit block 1122 can be designed as a block structure with four sides, and so on.

[0069] In some possible implementations disclosed in this application, see Figure 5 , Figure 7 and Fig. 9 As shown, limiting posts 11221 are provided at the four corners of the limiting block 1122 close to the locking member 2 . When the locking member 2 is rotated to the locking position, the corner of the locking member 2 is located between two adjacent limiting posts 11221 .

[0070] By setting the limiting column 11221, the corner of the locking piece 2 can be accurately positioned and limited. When the locking piece 2 is rotated to the locking position, its corner is firmly limited between two adjacent limiting columns 11221, preventing the locking piece 2 from any slight movement in the circumferential and axial directions. This precise limiting effect greatly improves the locking stability of the connection structure, ensuring that the locking piece 2 can remain in the correct locking position under various working conditions and will not loosen or shift due to external interference. At the same time, since the corners of the locking piece 2 are tightly clamped by the limiting column 11221, the connection structure has a strong anti-torsion ability. Even if it is subjected to external torsional force, the locking piece 2 is difficult to rotate, thereby ensuring the reliability of the connection. This is particularly important for some application scenarios that need to withstand large torque or vibration.

[0071] Furthermore, during the installation process, the limiting column 11221 can guide the locking member 2 to rotate to the correct position. The operator can easily determine whether the locking member 2 has been rotated to the locking position by observing the relative position between the corner of the locking member 2 and the limiting column 11221. This visual guidance method improves the accuracy and efficiency of the installation and reduces the possibility of installation errors. In other words, the presence of the limiting column 11221 enables the locking member 2 to be quickly and accurately positioned in the locking position. The operator does not need to perform complicated adjustments and trial and error, and only needs to rotate the locking member 2 to the position where its corner matches the limiting column 11221 to complete the installation. This greatly saves installation time and improves work efficiency.

[0072] Among them, on the side of the limit block 1122 close to the locking member 2, that is, the side in contact with the locking member 2, limit posts 11221 are respectively arranged at the four corners. These limit posts 11221 are columnar structures protruding from the surface of the limit block 1122, and have a certain height and strength.

[0073] Specifically, when the locking member 2 is rotated to the locked position, its position in space is specific. At this time, the corners of the locking member 2, that is, the vertices of its polygonal shape, will be exactly located between two adjacent limiting posts 11221. This means that the limiting posts 11221 form a "cage-like" structure around the locking member 2, limiting the corners of the locking member 2 to a specific position.

[0074] In the above embodiments, see Figure 5 and Figure 7 As shown, the height of the limiting column 11221 is greater than the thickness of the locking member 2.

[0075] It should be noted that the higher limiting column 11221 can provide a stronger limiting force on the locking member 2 in the vertical direction. When the locking member 2 is rotated to the locked position, the limiting column 11221 not only prevents the circumferential movement of the locking member 2 by clamping the corner of the locking member 2 in the horizontal direction, but also constrains the locking member 2 in the vertical direction. Since the height of the limiting column 11221 is greater than the thickness of the locking member 2, it is more difficult for it to be out of the limit due to shaking up and down, thereby greatly enhancing the limit stability of the connection structure.

[0076] Furthermore, since the height of the limiting column 11221 is greater than the thickness of the locking member 2, it can accommodate locking members 2 of different thicknesses within a certain range. In practical applications, if it is necessary to replace locking members 2 of different thicknesses, as long as the thickness is less than the height of the limiting column 11221, the connection structure can still be used normally. This increases the versatility and adaptability of the connection structure and reduces the cost and trouble of replacing the entire connection structure due to changes in the thickness of the locking member 2.

[0077] In some possible implementations disclosed in this application, see Fig. 9 As shown, a chamfered structure 11222 is provided on the top of the limiting column 11221 , and at least a part of the chamfered structure 11222 is an inclined surface. When the locking member 2 applies a force to the inclined surface, the limiting column 11221 moves in a direction away from the locking member 2 .

[0078] It should be noted that during the installation process, when the locking member 2 rotates close to the limiting column 11221, it first contacts the inclined surface of the chamfered structure 11222 at the top of the limiting column 11221. As the locking member 2 continues to rotate, it applies force to the inclined surface, causing the limiting column 11221 to move in a direction away from the locking member 2. This movement provides a certain amount of space for the locking member 2, making the installation process smoother and reducing resistance and jamming during installation. The operator can more easily rotate the locking member 2 to the locked position, thereby improving installation efficiency.

[0079] Furthermore, this feature can also be used when the connection structure needs to be disassembled. By rotating the locking member 2 in the opposite direction so that it applies force to the inclined surface again, the limiting column 11221 moves again in the direction away from the locking member 2. In this way, the restriction of the limiting column 11221 on the locking member 2 is released, so that the fixing member 1 can be more easily withdrawn from the through hole 41 of the carrier 4, thereby realizing the separation of the object 3 to be fixed from the carrier 4. The disassembly process becomes simpler and faster, reducing the time and effort required for disassembly.

[0080] Specifically, when the locking member 2 applies a force to the inclined surface, the force will be decomposed into a component force perpendicular to the inclined surface and a component force parallel to the inclined surface along the direction of the inclined surface. Among them, the component force perpendicular to the inclined surface will cause the limiting column 11221 to be pushed downward, while the component force parallel to the inclined surface will cause the limiting column 11221 to be pushed in a horizontal direction. Under the action of these two component forces, the limiting column 11221 will move in a direction away from the locking member 2. It can be understood that when the locking member 2 applies a force to the inclined surface, the movement of the limiting column 11221 can reduce the hard collision between the locking member 2 and the limiting column 11221, thereby reducing the risk of damage to the connecting part 12. At the same time, this movement can also disperse the effect of force, reduce local stress concentration, and improve the durability of the connecting structure.

[0081] In some possible implementations disclosed in this application, see Figure 1 As shown, a limiting groove 42 is provided on the carrier 4 at a position relative to the limiting portion 111 , and the limiting groove 42 is used to accommodate at least a portion of the limiting portion 111 .

[0082] By setting the limiting groove 42, an installation position is provided for the limiting part 111, so that during the installation process, the limiting part 111 can accurately enter the limiting groove 42. This precise positioning effect ensures the correct installation position of the connection structure on the carrier 4, and reduces the problem of unstable connection caused by installation deviation. At the same time, the limiting part 111 enters the limiting groove 42, and the wall surface of the limiting groove 42 will limit the limiting part 111 to prevent it from being displaced in the horizontal direction. During use, even if it is affected by external force, the limiting part 111 is difficult to escape from the limiting groove 42, thereby ensuring the relative position between the connection structure and the carrier 4 is stable and improving the reliability of the connection. At the same time, the cooperation between the limiting part 111 and the limiting groove 42 increases the contact area between the connection structure and the carrier 4. A larger contact area means that more stress can be dispersed at the connection part 12, reducing local stress concentration, thereby reducing the risk of damage to the connection part 12 due to excessive stress.

[0083] The limiting groove 42 may be a groove structure provided at a position of the lower surface of the carrier 4 relative to the limiting portion 111 .

[0084] Specifically, the limiting groove 42 is a circular groove, and when the connecting structure is assembled on the carrier 4, the limiting portion 111 enters the circular groove.

[0085] An embodiment of the second aspect of the present application provides a fuel assembly, including a connection structure as described above.

[0086] Specifically, when the connection structure is applied to a fuel assembly, the carrier 4 is the upper tube seat of the fuel assembly, and the part to be fixed 1 is the guide tube of the fuel assembly. It should be noted that the quick disassembly feature of the connection structure brings great convenience to the maintenance and overhaul of the fuel assembly. When it is necessary to inspect the fuel assembly or replace some parts, the operator can quickly separate the guide tube from the upper tube seat, perform the corresponding operations, and then easily install it back, which greatly reduces the maintenance cost and time.

[0087] 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.

[0088] 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 connection structure, characterized in that: Used to fix an object to be fixed (3) and a carrier (4), the connection structure comprises a fixing member (1) and a locking member (2), the object to be fixed (3) and the fixing member (1) are fixed relative to each other, a through hole (41) is provided on the carrier (4), the fixing member (1) is used to be inserted into the through hole (41), the locking member (2) is rotatably arranged at one end of the fixing member (1) away from the object to be fixed (3), the rotation path of the locking member (2) comprises a locking position, when the locking member (2) is rotated to the locking position, the locking member (2) passes through the carrier (4) through the through hole (41) and abuts against the upper surface of the carrier (4).

2. The connection structure according to claim 1, characterized in that: The fixing member (1) comprises a stopper (11), a connecting member (12) and a clamping member (13); the stopper (11) and the clamping member (13) are arranged along the extension direction of the connecting member (12); the connecting member (12) is used to pass through the through hole (41); and a clamping space for locking the locking member (2) and the carrier (4) is formed between the stopper (11) and the clamping member (13).

3. The connection structure according to claim 2, characterized in that: The stopper portion (11) comprises a limiting portion (111) and a locking portion (112); the limiting portion (111) is connected to the connecting portion (12); the locking portion (112) is arranged on the limiting portion (111) and sleeved outside the connecting portion (12); the locking portion (112) is an elastic structure; the locking portion (112) is used to abut against the locking member (2) and lock the locking member (2) when compressed.

4. The connection structure according to claim 3, characterized in that: The locking portion (112) comprises a spring (1121) and a limiting block (1122); the spring (1121) and the limiting block (1122) are both sleeved on the connecting portion (12); the spring (1121) is located between the limiting portion (111) and the limiting block (1122); and the limiting block (1122) is used to limit the locking member (2) in the circumferential direction of the locking member (2).

5. The connection structure according to claim 4, characterized in that: Limiting posts (11221) are arranged at the four corners of the limiting block (1122) on one side close to the locking member (2); when the locking member (2) is rotated to the locking position, the corner of the locking member (2) is located between two adjacent limiting posts (11221).

6. The connection structure according to claim 5, characterized in that: The height of the limiting column (11221) is greater than the thickness of the locking member (2).

7. The connection structure according to claim 5, characterized in that: The top of the limiting column (11221) is provided with a chamfered structure (11222), and at least a part of the chamfered structure (11222) is an inclined surface. When the locking member (2) applies a force to the inclined surface, the limiting column (11221) moves in a direction away from the locking member (2).

8. The connection structure according to claim 3, characterized in that: A limiting groove (42) is provided on the carrier (4) at a position relative to the limiting portion (111), and the limiting groove (42) is used to accommodate at least a portion of the limiting portion (111).

9. A fuel assembly, characterized in that: Comprising a connection structure as described in any one of claims 1 to 8.

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