CN115188502A - Fixing and anti-loosening device and method and tape box fuel assembly - Google Patents
Fixing and anti-loosening device and method and tape box fuel assembly Download PDFInfo
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- CN115188502A CN115188502A CN202210515838.9A CN202210515838A CN115188502A CN 115188502 A CN115188502 A CN 115188502A CN 202210515838 A CN202210515838 A CN 202210515838A CN 115188502 A CN115188502 A CN 115188502A
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- fixing
- metal plate
- loosening
- hole
- fuel assembly
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/34—Spacer grids
- G21C3/3424—Fabrication of spacer grids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
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Abstract
The invention relates to the technical field of fuel assemblies, in particular to a fixing anti-loosening device and method and a box fuel assembly. The fixing and anti-loosening device comprises: the first metal plate and the second metal plate are made of different materials, and the connecting part and the limiting part are connected; the first metal plate is provided with a through hole and at least one open slot, and the open slot is connected with the through hole; the second metal plate is provided with a connecting hole, and the connecting part passes through the through hole and is inserted into the connecting hole to be fixed; and a limiting part is arranged in the groove and is fixedly connected with the connecting part. The fixing and anti-loosening device can be used for fixing. A cartridge fuel assembly comprising said securing and anti-loosening means. The fixing and anti-loosening device disclosed by the invention is simple in structure, small in occupied space and strong in operability, and can realize fixing and loosening prevention among different materials in a small space. The fixing and anti-loosening device is applied to the fuel assembly, so that effective fixing of different parts can be realized, and the connection strength and quality can meet the requirements of nuclear facilities.
Description
Technical Field
The invention relates to the technical field of fuel assemblies, in particular to a fixing anti-loosening device and method and a box fuel assembly.
Background
The nuclear fuel assembly is the core of the reactor, and is designed into different forms according to different application reactor types and reactor performance indexes and by comprehensively considering a plurality of factors such as assembly safety, economy, processing simplicity and the like. According to whether a single group of fuel assemblies is mixed with a surrounding fuel assembly by a coolant, the fuel assemblies can be divided into a box fuel assembly and an open type fuel assembly, wherein the box fuel assembly is provided with a fuel box which is circumferentially and closely wrapped on the periphery of a fuel rod bundle and is mainly used in research reactors and fast reactors, and the open type fuel assembly is not provided with the wrapping structure and is mainly used in commercial pressurized water reactors.
In the fuel assembly, a plurality of parts need to be fixed and anti-loose designed so as to resist the unstable structure influence of the fuel assembly caused by a plurality of factors such as vibration, abrasion, impact and fatigue in a reactor. In the existing common tape box fuel assembly, a fuel box, an upper transition joint and a lower transition joint are made of the same material, the welding compatibility of the same material is good, the quality of a welding line easily meets the design requirement, and the fuel box and the upper transition joint and the lower transition joint can be connected and fixed in a butt-joint girth welding mode.
In some novel tape box fuel assemblies, due to considerations of reactor physics, radiation swelling and the like of related materials, the fuel cartridge and the upper and lower transition joints or other parts are made of different materials, and if the fuel cartridge and the upper and lower transition joints or other parts are connected and fixed in a conventional butt-joint girth welding mode, the conditions that the quality of a welding seam, the surface quality of the welding seam and the connection strength cannot meet design requirements exist, which brings great challenges to the safety of the fuel assembly in the reactor.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a fixing and anti-loosening device, a fixing and anti-loosening method and a tape-box fuel assembly are provided, different materials can be fixed, and the connection strength and quality can meet the requirements of nuclear facilities.
The invention provides a fixing and anti-loosening device, which comprises: the device comprises a first metal plate, a second metal plate, a connecting part and a limiting part;
the first metal plate and the second metal plate are made of different materials; the first metal plate is provided with a through hole and at least one open slot, and the open slot is connected with the through hole;
the second metal plate is provided with a connecting hole,
the connecting part penetrates through the through hole and is inserted into the connecting hole and fixed;
and a limiting part is arranged in the slot and fixedly connected with the connecting part.
Preferably, the first metal plate is disposed on the second metal plate; or alternatively
The first metal plate is arranged on the outer layer, and the second metal plate is arranged on the inner layer.
Preferably, the connecting member has a boss at an upper end thereof.
Preferably, the limiting part is filled with the slots, and the lug bosses of the connecting part are clamped on the limiting part.
Preferably, the connecting member and the second metal plate are made of the same material, and the stopper member and the second metal plate are made of the same material.
Preferably, the connecting part and the limiting part are welded.
Preferably, the number of the slots is 2-4.
Preferably, the connecting part is connected with the connecting hole through threads.
The invention provides a fixing and anti-loosening method, which is used for fixing by using the fixing and anti-loosening device in the technical scheme.
The invention also provides a fuel assembly with a box, which comprises the fixing and anti-loosening device in the technical scheme.
Compared with the prior art, the fixing and anti-loosening device can realize the fixing and anti-loosening among different materials in a small space. The device has the advantages of simple structure, small occupied space, strong operability and low starting difficulty. The fixing and anti-loosening device is applied to the fuel assembly, so that effective fixing of different parts can be realized, and the connection strength and quality can meet the requirements of nuclear facilities.
Drawings
FIG. 1 is a schematic structural view of a fixing and anti-loosening device;
FIG. 2 is a top view of the fixed anti-loosening apparatus;
fig. 3 is an overall view of a cartridge fuel assembly using a fixing and loosening prevention device;
fig. 4 is an overall sectional view of a cartridge fuel assembly using a fixing and loosening prevention device;
fig. 5 is a partial cross-sectional view of a cartridge fuel assembly using a securing check;
in the figure: 1. a connecting member; 2. a limiting component; 3. a first metal plate; 4. a second metal plate; 5. a screw; 6. an anti-loosening sheet; 7. hoisting the head; 8. an upper enclosure; 9. an upper grid plate; 10. a fuel cartridge; 11. a lower grid plate; 12. a lower end head; 13. a fuel bundle.
Detailed Description
For a further understanding of the invention, embodiments of the invention are described below in conjunction with the examples, but it should be understood that these descriptions are included merely to further illustrate features and advantages of the invention, and are not intended to limit the invention.
The embodiment of the invention discloses a fixed anti-loosening device, which comprises the following components in part by weight as shown in figure 1: a first metal plate 3, a second metal plate 4, a connecting member 1 and a stopper member 2;
the first metal plate 3 and the second metal plate 4 are made of different materials; the first metal plate 3 is provided with a through hole and at least one open slot, and the open slot is connected with the through hole;
the second metal plate 4 is provided with a connecting hole;
the connecting part 1 passes through the through hole and is inserted into the connecting hole and fixed;
and a limiting part 2 is arranged in the groove, and the limiting part 2 is fixedly connected with the connecting part 1.
According to the invention, the securing and locking device is described in detail below:
the first metal plate 3 and the second metal plate 4 have a certain thickness and are made of different materials.
The two are in contact with each other. The first metal plate 3 is arranged on the second metal plate 4; or
The first metal plate 3 is arranged on the outer layer, and the second metal plate 4 is arranged on the inner layer.
As shown in fig. 2, the first metal plate 3 is provided with a through hole and at least one slot, and the slot is connected with the through hole;
the through hole is used for connecting with the connecting part 1; the slot is used for placing the limiting part 2.
And the second metal plate 4 is provided with a connecting hole which is communicated with the through hole.
The connecting part 1 penetrates through the through hole and is inserted into the connecting hole and fixed; alternatively, the connecting member 1 is screwed to a connecting hole.
The upper end of the connecting part 1 has a boss, and the upper end of the connecting part 1 is the side close to the first metal plate 3. The boss can compress the limiting part 2 to avoid transverse movement.
The connecting part 1 may be embodied as a screw, bolt or other part with connecting and prestressing capability. Preferably, the material of the connecting member 1 is the same as the second metal plate 4.
And a limiting part 2 is arranged in the groove, and the limiting part 2 is fixedly connected with the connecting part 1. The limiting part 2 is full of the slots, and the bosses of the connecting part of the limiting part are clamped on the limiting part. The limiting part 2 fixes the connecting part 1 and prevents the connecting part 1 from moving transversely.
Preferably, the second metal plate 4 of the limiting part 2 is made of the same material.
For a more secure connection, the connecting part 1 and the position limiting part 2 are preferably welded.
The number of the grooves is 1, or 2-4, so that the stability of fixation is improved.
The embodiment of the invention also discloses a fixing and anti-loosening method, and the fixing and anti-loosening device is used for fixing.
When two different materials appear and carry out fixed connection promptly, adopt above-mentioned technical scheme's device to fix and locking.
The embodiment of the invention also discloses a fuel assembly with a box, which comprises the fixing and anti-loosening device in the technical scheme.
A cartridge fuel assembly comprising: a plurality of parts, in particular a hoisting head, an upper enclosure, an upper grid plate, a lower grid plate, a fuel bundle, a lower transition joint, a fuel box and the like;
the components of the tape box fuel assembly have a plurality of connecting and fixing requirements, when the materials of certain connected components with the fixing requirements are the same, conventional fixing connection modes such as threaded connection and welding are selected, and when the materials of the connected components are different and the connected components do not have strict sealing requirements, for example, the materials of a fuel box and an upper transition joint and a lower transition joint are different, the method can be used for fixing and preventing the components from loosening.
For further understanding of the present invention, the following detailed description of the fixing and loosening preventing device, the method and the fuel cartridge assembly according to the present invention will be provided with reference to the following embodiments, and the scope of the present invention is not limited by the following embodiments.
Example 1
As shown in fig. 1, the first metal plate 3 and the second metal plate 4 are fixed and prevented from loosening by the connecting member 1 and the limiting member 2.
The first metal plate 3 and the second metal plate 4 both have a certain thickness and are stacked, the first metal plate 3 has a through hole, a connecting hole with the same size is formed in the second metal plate 4, and a thread is arranged in the connecting hole. The first metal plate 3 is provided with a slot, and the slot is connected with the through hole.
The limiting part 2 is placed in the slot of the first metal plate 3 and is plugged tightly;
the connecting part 1 is of a screw structure, passes through the through hole of the first metal plate 1, is screwed into the connecting hole of the second metal plate 4, and applies pretightening force to realize the primary connection and fixation of the first metal plate 3 and the second metal plate 4;
as shown in fig. 2, the slotting shape of the first metal plate 3 is consistent with that of the connecting part 1 and the limiting part 2, and the slotting space of the first metal plate 3 is filled with the limiting part 2, so that the first metal plate 3, the second metal plate 4, the connecting part 1 and the limiting part 2 are transversely fixed;
the contact part of the connecting part 1 and the limiting part 2 is subjected to spot welding, the rotation of the connecting part 1 is limited, so that the looseness prevention of the connecting part 1 and the limiting part 2 is realized, and meanwhile, the first metal plate 3 and the second metal plate 4 are completely fixed and have looseness prevention capability.
Example 2
As shown in fig. 3, in this case, the connecting component 1 in the fixing and anti-loosening method of the present invention is in the form of a screw 5, and the limiting component 2 is in the form of an anti-loosening sheet 6;
as shown in FIG. 4, the fuel bundle 13 is located at the center of the fuel assembly, and the hanging head 7, the upper enclosure 8, the upper grid 9, the fuel cartridge 10, the lower grid 11, and the lower end 12 are connected in sequence and form an independent channel to enclose the fuel bundle 13.
The hoisting head 7 is used for lifting, placing and grabbing in the component transferring process; the upper enclosure 8 is used for preventing foreign matters in the reactor from flowing into the fuel assembly; the cartridge 10 provides a closed flow path for coolant flowing through the fuel bundle 13; the upper grid plate 9 connects the upper enclosure 8 with the fuel cartridge 10, has an open-pore structure in the center, and provides positioning for the upper ends of the fuel bundles 13; the lower grid plate 11 connects the fuel cartridge 10 with the lower end 12, has an open hole structure in the center, and provides lower end positioning for the fuel bundle 13; the lower end 12 is seated in the lower grid plate 11 of the reactor core to support and fix the assembly;
the materials of the hoisting head 7, the upper surrounding shell 8, the upper grid plate 9, the lower grid plate 11 and the lower end 12 are stainless steel, the material of the fuel box 10 is zirconium, and the quality of a welding seam, the surface quality of the welding seam and the connection strength cannot be ensured according to a conventional welding method;
therefore, by applying the fixing and anti-loosening method, the hoisting head 7 is connected with the upper enclosing plate through pins and fixed through spot welding, and the upper enclosing shell 8 and the upper grid plate 9, and the lower grid plate 11 and the lower end 12 are fixed through butt-joint circumferential welding;
as shown in fig. 5, the fuel cartridge 10 is externally sleeved on the upper grid 9 and the lower grid 11 and is in close contact therewith.
The fuel box 10 is provided with a groove, the upper grid plate 9 and the lower grid plate 11 are both provided with threaded holes, and the groove of the fuel box 10 corresponds to the threaded holes of the upper grid plate 9 and the lower grid plate 11;
the anti-loosening sheet 6 is placed in a groove of the fuel box 10, the screw 5 is inserted into the groove of the fuel box 10 and screwed into the threaded holes of the upper grid plate 9 and the lower grid plate 11, and pretightening force is applied to realize the primary connection and fixation of the fuel box 10 and the upper grid plate 9 as well as the lower grid plate 11;
the fuel box 10 is slotted in a shape consistent with the shape of the screw 5 and the anti-loosening sheet 6, and the screw 5 and the anti-loosening sheet 6 fill up the slotted space of the fuel box 10, so that the fuel box 10, the upper grid plate 9, the lower grid plate 11, the screw 5 and the anti-loosening sheet 6 are fixed transversely;
the contact part of the connecting part 1 and the limiting part 2 is spot-welded to limit the rotation of the connecting part 1, so that the locking of the screw 5 and the locking piece 6 is realized, and meanwhile, the fuel cartridge 10, the upper grid plate 9 and the lower grid plate 11 are completely fixed and have locking capability.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A fixing and anti-loosening device, comprising: the device comprises a first metal plate, a second metal plate, a connecting part and a limiting part;
the first metal plate and the second metal plate are made of different materials; the first metal plate is provided with a through hole and at least one open slot, and the open slot is connected with the through hole;
the second metal plate is provided with a connecting hole;
the connecting part penetrates through the through hole and is inserted into the connecting hole and fixed;
and a limiting part is arranged in the slot and fixedly connected with the connecting part.
2. The securing anti-loosening device according to claim 1, wherein the first metal plate is disposed on a second metal plate; or alternatively
The first metal plate is arranged on the outer layer, and the second metal plate is arranged on the inner layer.
3. The fixing and loosening prevention device as claimed in claim 1, wherein the coupling member has a boss at an upper end thereof.
4. The fixing and loosening prevention device as claimed in claim 3, wherein the limiting member is filled with the slot, and the boss of the connecting member is engaged with the limiting member.
5. The fixing and loosening prevention device of claim 1, wherein the connection member is the same material as the second metal plate, and the stopper member is the same material as the second metal plate.
6. The fixing and loosening prevention device according to claim 5, wherein the connecting member and the stopper member are welded to each other.
7. The fixing and loosening prevention device of claim 5, wherein the number of the slots is 2 to 4.
8. The fixing and loosening prevention device of claim 5, wherein the connection member is threadedly connected to the connection hole.
9. A fixing and anti-loosening method, characterized in that the fixing and anti-loosening device of any one of claims 1 to 8 is used for fixing.
10. A fuel assembly with a cartridge, characterized in that it comprises a fixing and anti-loosening device as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210515838.9A CN115188502A (en) | 2022-05-11 | 2022-05-11 | Fixing and anti-loosening device and method and tape box fuel assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210515838.9A CN115188502A (en) | 2022-05-11 | 2022-05-11 | Fixing and anti-loosening device and method and tape box fuel assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115188502A true CN115188502A (en) | 2022-10-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210515838.9A Pending CN115188502A (en) | 2022-05-11 | 2022-05-11 | Fixing and anti-loosening device and method and tape box fuel assembly |
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| CN (1) | CN115188502A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000000323A (en) * | 1999-10-12 | 2000-01-15 | 최창묵 | The screw for use the lifted prevention |
| CN103573775A (en) * | 2012-08-11 | 2014-02-12 | 江苏启源雷宇电气科技有限公司 | Anti-play terminal stud of hollow reactor |
| CN109578418A (en) * | 2018-12-07 | 2019-04-05 | 国家电网有限公司 | A kind of bolt locking structure |
-
2022
- 2022-05-11 CN CN202210515838.9A patent/CN115188502A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000000323A (en) * | 1999-10-12 | 2000-01-15 | 최창묵 | The screw for use the lifted prevention |
| CN103573775A (en) * | 2012-08-11 | 2014-02-12 | 江苏启源雷宇电气科技有限公司 | Anti-play terminal stud of hollow reactor |
| CN109578418A (en) * | 2018-12-07 | 2019-04-05 | 国家电网有限公司 | A kind of bolt locking structure |
Non-Patent Citations (1)
| Title |
|---|
| 汪建红;杨通高;沈林;钟毅;: "实验快堆转换区组件焊接工艺", 电焊机, no. 11 * |
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