A fuel assembly upper connection dismounting integrated device and fuel assembly

Abstract

The application discloses a fuel assembly upper connection dismounting integrated device and a fuel assembly, and relates to the field of nuclear reactions. The integrated device comprises an upper tube seat, a connecting sleeve, a circumferential telescopic locking mechanism, a dismounting connecting piece and a reset spring. The connecting sleeve is arranged on the inner side wall of the circumferential telescopic locking mechanism, and four matching grooves are uniformly arranged on the circumferential wall of the connecting sleeve and the circumferential wall of the circumferential telescopic locking mechanism. When the integrated device is dismounted, the upper part of the device is inserted into the dismounting connecting piece, the lower part of the dismounting connecting piece is provided with a dismounting cylindrical wedge-shaped wall, the diameter of the dismounting cylindrical wedge-shaped wall is equal to the inner diameter of the connecting sleeve, when the dismounting cylindrical wedge-shaped wall is downwardly inserted, the telescopic block is extruded outwardly due to the cooperation of the two wedge-shaped walls, then the upper tube seat is taken out upwardly, and the dismounting is realized. When the integrated device is assembled, the dismounting cylindrical wedge-shaped wall is arranged in the connecting sleeve, the upper tube seat is sleeved with the connecting sleeve, then the cylindrical wedge-shaped wall is taken out, and the reset spring makes the telescopic block radially close to the axis of the connecting sleeve, so that the connecting sleeve and the upper tube seat are clamped.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of nuclear reactions, in particular to a fuel assembly upper part connection disassembly integrated device and a fuel assembly. BACKGROUND

[0002] In the fuel assembly, a plurality of guide tube holes are provided through the upper tube seat, and each guide tube hole needs to be connected with a corresponding guide tube.

[0003] At present, a threaded connection piece is commonly used in the market to threadedly cooperate with the guide tube hole to establish the connection between the upper tube seat and the guide tube. This connection mode causes difficulty in disassembling the upper tube seat, which is time-consuming and laborious. SUMMARY

[0004] The present application aims to provide a fuel assembly upper part connection disassembly integrated device which has the characteristics of convenient disassembly.

[0005] Another object of the present application is to provide a fuel assembly which has the characteristics of convenient disassembly.

[0006] The present application provides a technical solution:

[0007] A fuel assembly upper part connection disassembly integrated device comprises an upper tube seat, a connecting sleeve, a circumferential telescopic locking mechanism, a disassembly connecting piece and a reset spring. The connecting sleeve is arranged on the inner side wall of the circumferential telescopic locking mechanism. The connecting sleeve and the circumferential telescopic locking mechanism are both provided with four matching grooves uniformly distributed in the circumferential direction, which are respectively the connecting sleeve matching groove and the telescopic block matching groove. The circumferential telescopic locking mechanism is provided with two spring embedding grooves in the circumferential direction. The spring embedding grooves are recessed in the four telescopic block matching grooves. After the connecting sleeve is sleeved with the circumferential telescopic locking mechanism, the four telescopic blocks are simultaneously arranged in the connecting sleeve matching groove and the telescopic block matching groove. The telescopic block is provided with two telescopic block spring embedding grooves recessed in the lateral side. The other side is provided with telescopic block wedge walls at the upper and lower ends. The upper tube seat is arranged on the outer side wall of the circumferential telescopic locking mechanism. When disassembling, the upper tube seat is inserted into the disassembly connecting piece. The disassembly connecting piece is provided with a disassembly cylindrical wedge wall at the lower part. The diameter of the disassembly cylinder is equal to the inner diameter of the connecting sleeve. When the disassembly cylinder is inserted downward, the telescopic blocks are extruded outward due to the cooperation of the two wedges, and then the upper tube seat is taken out upward to realize disassembly. When assembling, the disassembly cylinder is arranged in the connecting sleeve, the upper tube seat is sleeved into the connecting sleeve, and then the disassembly cylinder is taken out. At the same time, the reset spring makes the telescopic blocks close to the axis of the connecting sleeve in the radial direction to clamp the connecting sleeve and the upper tube seat.

[0008] Further, the number of the telescopic block matching grooves is four, and the four telescopic block matching grooves are uniformly distributed in the circumferential direction on the side wall of the circumferential telescopic locking mechanism.

[0009] The number of the connecting sleeve fitting grooves is four, and the four connecting sleeve fitting grooves are evenly distributed on the connecting sleeve side wall.

[0010] Further, one side of the telescopic block is transversely recessed with two telescopic block spring embedding grooves, and the other side is provided with telescopic block wedge walls at the upper and lower ends, respectively, and a plurality of telescopic blocks are used for corresponding fitting with a plurality of connecting sleeve fitting grooves and telescopic block fitting grooves, respectively.

[0011] Further, the circumferential telescopic locking mechanism comprises a telescopic locking boss, a spring embedding groove, a telescopic block fitting groove, and a telescopic locking cylinder, the telescopic locking boss is attached to the upper tube seat upper cavity, the telescopic locking cylinder inner diameter is equal to the connecting sleeve outer diameter, and is smaller than the telescopic locking boss inner diameter;

[0012] The connecting sleeve inner diameter is equal to the telescopic locking boss inner diameter.

[0013] Further, the upper tube seat comprises an upper tube seat upper cavity, an upper tube seat connecting cavity, an upper tube seat lower cavity, and an upper tube seat bottom hole, the upper tube seat upper cavity inner diameter is equal to the telescopic locking boss outer diameter, and is larger than the telescopic locking cylinder outer diameter, the upper tube seat upper cavity upper surface is flush with the telescopic locking boss upper surface, the upper tube seat upper cavity lower surface is flush with the telescopic locking boss lower surface, the upper tube seat connecting cavity inner diameter is equal to the telescopic locking cylinder outer diameter, the upper tube seat lower cavity inner diameter is larger than the telescopic locking cylinder outer diameter, and the radius difference is larger than the telescopic block thickness, and the upper tube seat bottom hole diameter is larger than the connecting sleeve outer diameter.

[0014] Further, the disassembly connecting piece comprises a disassembly connecting inner cylinder, a bolt hole, a disassembly abutting table, and a disassembly cylinder, the bolt hole fixedly connects the disassembly connecting piece with the upper connecting rod, the disassembly abutting table outer diameter is larger than the telescopic locking boss inner diameter, and the disassembly cylinder outer diameter is equal to the connecting sleeve inner diameter.

[0015] Further, the disassembly cylinder end chamfer is a disassembly cylinder wedge wall, and the disassembly cylinder wedge wall has the same wedge angle as the telescopic block wedge wall.

[0016] Further, after the reset spring is embedded in the spring embedding groove, it is in a stretched state, continuously providing a radial force to the telescopic block, so that the telescopic block radially approaches the connecting sleeve axis during reset, clamping the connecting sleeve and the upper tube seat.

[0017] Further, when the circumferential telescopic locking mechanism is assembled to the upper tube seat, the circumferential telescopic locking mechanism is welded on the upper tube seat, realizing the integration of the circumferential telescopic locking mechanism and the upper tube seat, preventing the circumferential telescopic locking mechanism from moving axially, and after one-time assembly is completed, no further operation is needed.

[0018] The present invention also provides a fuel assembly, including the aforementioned integrated upper connection and disassembly device for the fuel assembly. The integrated upper connection and disassembly device for the fuel assembly includes an upper tube seat, a connecting sleeve, a circumferential telescopic locking mechanism, a disassembly connector, and a return spring. The connecting sleeve is placed on the inner side wall of the circumferential telescopic locking mechanism. Both the connecting sleeve and the side wall of the circumferential telescopic locking mechanism have four uniformly arranged mating grooves, namely the connecting sleeve mating groove and the telescopic block mating groove. The circumferential telescopic locking mechanism has two spring embedding grooves that are circumferentially recessed between the four telescopic block mating grooves. After the connecting sleeve and the circumferential telescopic locking mechanism are fitted together, the four telescopic blocks are simultaneously placed in the connecting sleeve mating groove and the telescopic block mating groove. Two telescopic block spring embedding grooves are laterally recessed on one side of the telescopic block, and the upper and lower ends of the other side are respectively provided with telescopic block wedge walls. The upper tube seat is placed on the outer side wall of the circumferential telescopic locking mechanism.

[0019] Compared to existing technologies, the fuel assembly upper connection and disassembly integrated device provided by this invention allows for disassembly by inserting a disassembly connector at the top. The lower part of the disassembly connector has a disassembly cylindrical wedge-shaped wall, the diameter of which is equal to the inner diameter of the connecting sleeve. When the disassembly cylinder extends downwards, the two wedges engage, pushing the telescopic block outwards, and then the upper tube seat is removed upwards, thus achieving disassembly. During assembly, with the disassembly cylinder inside the connecting sleeve, the upper tube seat is fitted into the connecting sleeve, and then the cylinder is removed. Simultaneously, a return spring causes the telescopic block to radially approach the axis of the connecting sleeve, locking the connecting sleeve and the upper tube seat together. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the integrated assembly and disassembly device for the upper part of the fuel assembly provided in an embodiment of the present invention;

[0022] Figure 2 An exploded view of the integrated fuel assembly upper connection and disassembly device provided in an embodiment of the present invention;

[0023] Figure 3 for Figure 2 Cross-sectional view of the upper and middle pipe fittings;

[0024] Figure 4 for Figure 2 Schematic diagram of the connection structure between the central circumferential telescopic locking mechanism, the telescopic block and the return spring;

[0025] Figure 5 for Figure 2 Schematic diagram of the middle connecting sleeve;

[0026] Figure 6 for Figure 2 Schematic diagram of the structure of the expansion joint;

[0027] Figure 7 for Figure 2 A structural diagram of the disassembly connector.

[0028] Icons: 100 - Disassemble the connector; 101 - Disassemble the cylinder; 1011 - Disassemble the cylinder wedge wall; 102 - Disassemble the abutment; 103 - Disassemble the connecting inner cylinder; 1031 - Bolt hole; 200 - Circumferential telescopic locking mechanism; 201 - Spring embedding groove (upper); 202 - Spring embedding groove (lower); 203 - Telescopic locking boss; 204 - Telescopic locking cylinder; 205 - Telescopic block mating groove; 300 - Return spring; 400 - Connecting sleeve; 401 - Connecting sleeve mating groove; 500 - Upper tube seat; 501 - Upper cavity of upper tube seat; 502 - Connecting cavity of upper tube seat; 503 - Lower cavity of upper tube seat; 504 - Bottom hole of upper tube seat; 600 - Telescopic block; 601 - Telescopic block wedge wall; 602 - Telescopic block spring embedding groove (upper); 603 - Telescopic block spring embedding groove (lower). Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are mainly embodiments of connecting and correspondingly disassembling key parts, and are only some embodiments of the present invention, not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of the present application, it is to be understood by those skilled in the art that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular use orientation, must be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] In addition, the terms "first", "second", and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present application, it is to be understood that, unless otherwise explicitly specified and limited, the terms "provided", "connected" and the like should be broadly understood, for example, "connected" can be fixedly connected, or detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0036] Embodiment

[0037] Please refer to Figures 1 to 2 , Figure 1 Fig. 1 shows a structural schematic diagram of a fuel assembly upper connection disassembly integrated device, Figure 2 Fig. 2 shows an exploded schematic diagram of a fuel assembly upper connection disassembly integrated device.

[0038] The fuel assembly upper connection dismounting integrated device provided by the embodiment comprises a dismounting connector 100, a circumferential telescopic locking mechanism 200, a reset spring 300, a connecting sleeve 400, an upper tube seat 500 and a telescopic block 600. The reset spring 300 is wrapped in the spring embedding groove (upper) 201 and the spring embedding groove (lower) 202 of the connecting telescopic locking cylinder 204 of the circumferential telescopic locking mechanism 200. The upper tube seat 500 is respectively provided with the upper tube seat upper cavity 501, the upper tube seat connecting cavity 502 and the upper tube seat lower cavity 503 which all extend in the axial direction. The upper tube seat upper cavity 501 and the upper tube seat connecting cavity 502 are directly welded with the circumferential telescopic locking mechanism 200 after the assembly of the circumferential telescopic locking mechanism 200 is completed, and the circumferential telescopic locking mechanism 200 and the upper tube seat 500 are integrated, so as to prevent the circumferential telescopic locking mechanism 200 from moving in the axial direction; the upper tube seat lower cavity 503 is used for providing telescopic space for the telescopic block 600, and is empty when connected, and is filled and extruded outward when dismounted, so as to take out the upper tube seat 500 upward. The circumferential telescopic locking mechanism 200 mainly comprises the telescopic locking cylinder 204, the telescopic block 600 and the reset spring 300. The telescopic locking cylinder 204 is provided with four telescopic block matching grooves 205 which are matched with the four telescopic blocks 600 respectively, and the telescopic block 600 can be telescoped in the radial direction to change the diameter. The telescopic locking cylinder 204 and the telescopic block 600 are both provided with two coordination grooves in the circumferential direction, and are connected with the upper and lower reset springs 300 respectively, and the reset spring 300 plays a radial reset role after the diameter of the telescopic block 600 is changed. The four connecting sleeve matching grooves 401 on the connecting sleeve 400 are also matched with the four telescopic blocks 600, the connecting sleeve 400 is inserted into the circumferential telescopic locking mechanism 200 to realize locking. The dismounting cylinder wedge wall 1011 at the lowermost part of the dismounting cylinder 101 in the dismounting connector 100 is matched with the telescopic block wedge wall 601 of the telescopic block 600, the diameter of the dismounting cylinder 101 is the same as the inner diameter of the connecting sleeve 400, the dismounting cylinder 101 is inserted into the connecting sleeve 400 during dismounting, the matched dismounting cylinder wedge wall 1011 extrudes the telescopic block 600 outward, the upper tube seat 500 is taken out, and thus the dismounting is completed.

[0039] In actual application, the circumferential telescopic locking mechanism 200 is integrated, and once the assembly is completed, no additional operation is needed. After the circumferential telescopic locking mechanism 200 is assembled to the upper tube seat 500, the circumferential telescopic locking mechanism 200 is directly welded on the upper tube seat 500, and the circumferential telescopic locking mechanism 200 and the upper tube seat 500 become an integral whole, so that the circumferential telescopic locking mechanism 200 will not move in the axial direction, and the connection is more firm. During dismounting, the circumferential telescopic locking mechanism 200 is taken out upward together with the upper tube seat 500, and is separated from the connecting sleeve 400. Actually, the four telescopic blocks 600 are separated from the connecting sleeve 400.

[0040] When the telescopic block 600 is fitted, one side of the telescopic block wedge wall 601 faces the inside of the circumferential telescopic locking mechanism 200, and the opposite side is directed to the upper pipe base connecting cavity 502. The outer side is always tangent to the telescopic locking cylinder 204 under the action of the return spring 300. The thickness of the telescopic block 600 is greater than the wall thickness of the telescopic locking cylinder 204. After the connecting sleeve 400 is inserted into the connecting sleeve fitting groove 401 and aligned with the telescopic block 600, the connecting sleeve fitting groove 401 is fitted with the remaining part of the telescopic block wedge wall 601 and the telescopic block 600 and the telescopic locking cylinder 204, and the telescopic block 600 is fitted with the telescopic locking cylinder 204. The connecting sleeve 400 and the guide pipe below are connected to the lower pipe base by bolts, so that the connection between the upper pipe base 500 and the lower pipe base is achieved.

[0041] When the upper pipe base 500 is to be disassembled, only a simple disassembly tool is needed for simple insertion and extraction operations. When disassembling, the disassembly tool used by the operator is a disassembly cylinder 101. The lowermost end of the disassembly cylinder 101 is a disassembly cylinder wedge wall 1011 that can be fitted with the telescopic block wedge wall 601. The diameter of the disassembly cylinder 101 is the same as the inner diameter of the telescopic locking cylinder 204, and is fitted by a gap. During the process of deepening downward, the telescopic block 600 is extruded outward due to the cooperation of the telescopic block wedge wall 601 and the disassembly cylinder wedge wall 1011, and the telescopic block 600 is stretched in the radial direction to change the diameter. At this time, the upper pipe base 500 is lifted upward, and the disassembly is completed. After lifting, the telescopic block 600 that is extruded after being extruded is reset under the action of the return spring 300, and returns to the initial state of being tangent to the telescopic locking cylinder 204.

[0042] Compared with the existing threaded connection part and the threaded fitting of the upper pipe base 500, this scheme does not need to be rotated to a specific angle when disassembling and installing the upper pipe base 500. After the connecting sleeve 400 is inserted, no other action is needed. Only the connecting sleeve fitting groove 401 needs to be aligned with the telescopic block 600 and the radial force needs to be applied to push the connecting sleeve 400 into the telescopic locking cylinder 204. When disassembling, only the disassembly cylinder 101 needs to be axially coincided and inserted into the telescopic locking cylinder 204 to lift it, without other complex operations.

[0043] Please refer to Figure 3 and Figure 4 , Figure 3 is a cross-sectional view of the upper pipe base, Figure 4 is a connection structure diagram of the circumferential telescopic locking mechanism, the telescopic block and the return spring.

[0044] In this embodiment, the upper tube base 500 is provided with coaxial upper tube base upper cavity 501, upper tube base connecting cavity 502 and upper tube base lower cavity 503. The upper tube base upper cavity 501 and the upper tube base connecting cavity 502 are in close cooperation with the telescopic locking boss 203 and the outer wall of the telescopic locking cylinder 204 of the circumferential telescopic locking mechanism 200. The upper tube base 500 is further provided with an upper tube base bottom hole 504 below it, which has a diameter smaller than the telescopic locking cylinder 204, used for bearing the telescopic locking cylinder 204.

[0045] In practical application, the upper tube base 500 and the circumferential telescopic locking mechanism 200 are welded together after the first cooperation, which not only tightens the cooperation but also simplifies the operation steps of connection and disassembly. In order to ensure the accuracy of disassembly, the reserved amount of the upper tube base lower cavity 503 should be larger than the actual calculated amount. During disassembly, the telescopic block wedge wall 601 is extruded during the movement of the telescopic block 600, which realizes the telescopic movement in the axial direction, completes the change of diameter, and the telescopic block 600 protrudes and remains in the upper tube base lower cavity 503, completing the separation from the connecting sleeve 400. The thickness of the connecting sleeve 400 should not be too large, and should be smaller than the front projection width of the telescopic block wedge wall 601, so that the separation from the connecting sleeve 400 can be completed when the upper tube base 500 is lifted upward.

[0046] It should be noted that the nominal diameter of the disassembly cylinder 101 matches the nominal diameter of the inner diameter of the connecting sleeve 400, and an interference fit is adopted. The telescopic block 600 and the circumferential telescopic locking mechanism 200, and the telescopic block 600 and the connecting sleeve 400 are in clearance fit.

[0047] Please refer to Figure 5 , Figure 5 for the structure diagram of the connecting sleeve.

[0048] In order to realize the locking and disassembly of the upper tube base 500, the connecting sleeve 400 is designed with corresponding structure. This connecting sleeve 400 only needs to open four connecting sleeve cooperation grooves 401 in the corresponding cooperation places of the four telescopic blocks 600. When cooperating, keep axial coincidence with the telescopic locking cylinder 204, align the four telescopic blocks 600, stretch upward until the telescopic block 600 is clamped with the connecting sleeve 400, and the upper tube base 500 and the lower tube base are also correspondingly fastened and connected.

[0049] In order to prevent the situation that the connecting sleeve 400 cannot pass through the upper tube base 500, considering the multiple disassembly and assembly, the cooperation between the connecting sleeve 400 and the circumferential telescopic locking mechanism 200 strictly adopts clearance fit.

[0050] The reset spring 300 is part of the whole circumference telescopic locking mechanism 200, and its main function is to reset the telescopic block 600. The reset spring 300 has an upper reset spring and a lower reset spring, which are symmetrically distributed to ensure that the telescopic block 600 is tangent to the whole circumference telescopic locking mechanism 200 and does not appear to be misaligned. The reset spring 300 is embedded in the telescopic block spring embedding groove (upper) 602, the telescopic block spring embedding groove (lower) 603, and the spring embedding groove (upper) 201 and the spring embedding groove (lower) 202, which does not affect the external size of the whole mechanism and will not slide on the outer wall of the telescopic locking cylinder 204.

[0051] In this example, the reset spring 300 has a strict pre-tightening force requirement, which has enough shrinkage force to reset the protruding telescopic block 600 to return to the initial state of being tangent to the telescopic locking cylinder 204. At the same time, the tightening force should not be too large to prevent the telescopic block 600 from being forced out of the whole circumference telescopic locking mechanism 200 when it is retracted instantaneously.

[0052] Please refer to Figure 6 and Figure 7 , Figure 6 , which is a structural schematic diagram of the telescopic block, Figure 7 , which is a structural schematic diagram of the disassembly connecting piece.

[0053] The disassembly connecting piece 100 is a disassembly cylinder 101, and the lower end is a disassembly cylinder wedge wall 1011 matched with the telescopic block 600. When disassembling, only need to insert the disassembly cylinder 101, separate the buckled telescopic block 600 and the matched connecting sleeve 400 by extrusion, and lift the upper pipe base 500 to achieve separation. When assembling, because the disassembly cylinder 101 is in the connecting sleeve 400, only need to align and then put the upper pipe base 500 into the connecting sleeve 400, and then take out the disassembly cylinder 101, which is convenient to operate. The disassembly connecting piece 100 also includes a disassembly connecting inner cylinder 103 and a disassembly abutment 102, and the outer diameter of the disassembly abutment 102 is greater than the inner diameter of the telescopic locking boss 203. The disassembly connecting inner cylinder 103 is provided with a bolt hole 1031.

[0054] In summary, the fuel assembly upper connection disassembly integrated device provided by the embodiment can firmly connect the upper pipe base 500 with the connecting sleeve 400 and can be quickly and simply disassembled, which is simple in structure, time-saving and labor-saving, and very efficient.

[0055] In addition, the embodiment provides a fuel assembly convenient for connection and disassembly of a nuclear reactor, which comprises the aforementioned upper connection disassembly integrated device. Therefore, the fuel assembly has the characteristics of connection fastening and simple disassembly.

[0056] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A fuel assembly upper connection assembly and disassembly integrated device, characterized by, The utility model relates to a detachable connecting device of the upper pipe seat and the connecting sleeve, and relates to the technical field of the pipe connecting device. The upper pipe seat includes an upper pipe seat upper cavity, an upper pipe seat connecting cavity, an upper pipe seat lower cavity, and an upper pipe seat bottom hole. When the circumferential telescopic locking mechanism is assembled to the upper pipe seat, the circumferential telescopic locking mechanism is welded on the upper pipe seat, the circumferential telescopic locking mechanism and the upper pipe seat are integrated, and axial movement of the circumferential telescopic locking mechanism is prevented. When disassembled, the upper pipe seat is inserted into the disassembling connecting piece, the lower part of the disassembling connecting piece is provided with a disassembling cylinder wedge-shaped wall, the diameter of the disassembling cylinder is equal to the inner diameter of the connecting sleeve, when the disassembling cylinder is inserted downward, the telescopic block is extruded outward due to the cooperation of the disassembling cylinder wedge-shaped wall and the telescopic block wedge-shaped wall, and then the upper pipe seat is taken out upward, thereby achieving disassembly. When assembled, the disassembling cylinder is in the connecting sleeve, the upper pipe seat is sleeved into the connecting sleeve, the disassembling cylinder is taken out, and the telescopic block is radially close to the axis of the connecting sleeve under the action of the reset spring, thereby clamping the connecting sleeve and the upper pipe seat.

2. The fuel assembly upper connection disassembly integrated device according to claim 1, characterized by, The circumferential telescopic locking mechanism includes a telescopic locking boss, a spring embedding groove, a telescopic block matching groove, and a telescopic locking cylinder, the telescopic locking boss is attached to the upper pipe seat upper cavity, the inner diameter of the telescopic locking cylinder is equal to the outer diameter of the connecting sleeve, and is smaller than the inner diameter of the telescopic locking boss. The inner diameter of the connecting sleeve is equal to the inner diameter of the telescopic locking boss.

3. The fuel assembly upper connection disassembly integrated device according to claim 2, characterized by, The inner diameter of the upper pipe seat upper cavity is equal to the outer diameter of the telescopic locking boss, and is greater than the outer diameter of the telescopic locking cylinder, the upper surface of the upper pipe seat upper cavity is flush with the upper surface of the telescopic locking boss, the lower surface of the upper pipe seat upper cavity is flush with the lower surface of the telescopic locking boss, the inner diameter of the upper pipe seat connecting cavity is equal to the outer diameter of the telescopic locking cylinder, the inner diameter of the upper pipe seat lower cavity is greater than the outer diameter of the telescopic locking cylinder, and the difference in radius is greater than the thickness of the telescopic block, and the diameter of the upper pipe seat bottom hole is greater than the outer diameter of the connecting sleeve.

4. The fuel assembly upper connection disassembly integrated device according to claim 2, characterized by The disassembling connecting piece includes a disassembling connecting inner cylinder, a bolt hole, a disassembling abutment, and a disassembling cylinder, the bolt hole fixes and connects the disassembling connecting piece and the upper connecting rod, the outer diameter of the disassembling abutment is greater than the inner diameter of the telescopic locking boss, and the outer diameter of the disassembling cylinder is equal to the inner diameter of the connecting sleeve.

5. The fuel assembly upper connection disassembly integrated device according to claim 4, characterized by The wedge angle of the disassembling cylinder wedge-shaped wall is the same as that of the telescopic block wedge-shaped wall.

6. The fuel assembly upper connection disassembly integrated device according to claim 1, characterized by The reset spring is in a stretched state after being embedded in the spring embedding groove, continuously providing a radial force to the telescopic block, so that the telescopic block is radially close to the connection sleeve axis during reset, clamping the connection sleeve and the upper pipe seat.

7. A fuel assembly characterized by, The fuel assembly upper connection dismounting integrated device comprises a fuel assembly upper connection dismounting integrated device as claimed in any one of claims 1-6.

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