Fuel assembly plate spring protective sleeve

Abstract

The utility model belongs to the technical field of nuclear engineering, and discloses a fuel assembly plate spring protective sleeve which comprises a protective sleeve body, an anti-hooking assembly and supporting assemblies, the protective sleeve body is of an L-shaped structure and can be arranged on a plate spring on an upper pipe base in a sleeved mode to protect the plate spring, and two supporting pieces are arranged at the two ends of the protective sleeve body respectively. The supporting piece is supported on the upper tube seat base body and plays a role in supporting the plate spring, the first anti-hooking plate is arranged on the periphery of the protective sleeve body, the second anti-hooking plate is arranged between the inner periphery of the protective sleeve body and the plate spring, the effects of protecting the plate spring from hooking and colliding can be achieved, the fuel assembly is prevented from hooking the plate spring in the hoisting process, and the safety of the fuel assembly is improved. Under the action of the anti-hooking assembly, the risk that the fuel assembly is damaged due to the fact that the hook claws do not stretch out in time or shake when the fuel assembly is hoisted is avoided, and normal loading and operation of the fuel assembly are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear engineering, in particular to a leaf spring protective sleeve for a fuel assembly. Background Art

[0002] The leaf spring of the upper nozzle is one of the key components of the fuel assembly. Before hoisting the fuel assembly, a long-handled tool for hoisting the fuel assembly needs to be inserted into the inner side under the plate frame of the upper nozzle base body, and the hook claw extends out and hooks the inner side of the plate frame of the upper nozzle base body, and finally the fuel assembly is hoisted.

[0003] Since there is no protection measure for the leaf spring of the fuel assembly, after the long-handled tool for hoisting descends, the hook claw of the long-handled tool extends out and hooks the inner side of the lower plate frame of the upper nozzle base body. However, due to the untimely extension of the hook claw of the tool or the vibration of the long-handled tool, the hook claw hooks the leaf spring or collides with the leaf spring when it extends out, resulting in abrasion marks, chipped corners or even damage and deformation of the leaf spring, leading to the repair or scrapping of the entire fuel assembly, which needs to be transported back to the component manufacturing plant for reprocessing, restricting the refueling progress of the nuclear power plant fuel assembly and affecting the normal refueling and operation of the nuclear power plant.

[0004] Therefore, a leaf spring protective sleeve for a fuel assembly is urgently needed to solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide a leaf spring protective sleeve for a fuel assembly, which is sleeved on the leaf spring to prevent the fuel assembly from hooking the leaf spring during hoisting, avoid the risk of damage to the fuel assembly caused by untimely extension or vibration of the hook claw during hoisting of the fuel assembly, and ensure the normal refueling and operation of the fuel assembly.

[0006] In order to solve the above problems existing in the prior art, the utility model adopts the following technical solutions:

[0007] A leaf spring protective sleeve for a fuel assembly is sleeved on the leaf spring. The leaf spring protective sleeve for a fuel assembly includes:

[0008] A protective sleeve body, and the protective sleeve body is in an L-shaped structure;

[0009] An anti-hooking component, and the anti-hooking component includes a first anti-hooking plate and a second anti-hooking plate. The first anti-hooking plate is arranged on the periphery of the protective sleeve body, and the second anti-hooking plate is arranged between the inner periphery of the protective sleeve body and the leaf spring;

[0010] A supporting component, and the supporting component includes two supporting members. The two supporting members are respectively arranged at both ends of the protective sleeve body, and the supporting members support on the upper nozzle base body.

[0011] Preferably, the protective sleeve body includes two main body parts which are vertically arranged. The inner connection part and the outer connection part of the two main body parts respectively have a first docking surface and a second docking surface. The first docking surface has an arc chamfer, and the second docking surface has a docking right angle.

[0012] Preferably, the two main body parts are flexibly connected.

[0013] Preferably, the protective sleeve body further includes a support part which is arranged at the outer connection part of the two main body parts, and the support part is fixedly connected to the second docking surface and supports on the upper tube seat base body.

[0014] Preferably, the fuel assembly leaf spring protective sleeve further includes an insertion tube which is arranged at the bottom of the support part. The upper tube seat base body has a positioning hole, and the insertion tube is configured to be capable of being inserted and fixed with the positioning hole.

[0015] Preferably, the cross-sectional shape of the insertion tube is an annular structure.

[0016] Preferably, the cross-sectional shape of the support part is a triangular structure.

[0017] Preferably, the fuel assembly leaf spring protective sleeve further includes a cover plate which covers the protective sleeve body.

[0018] Preferably, the cover plate, the protective sleeve body, the anti-hooking component and the support component are integrally formed.

[0019] Preferably, the thicknesses of both the first anti-hooking plate and the second anti-hooking plate are 1 mm.

[0020] The beneficial effects of the present utility model are as follows:

[0021] The fuel assembly leaf spring protective sleeve provided by the present utility model has an L-shaped structure for protecting the leaf spring sleeved on the upper tube seat. The support assembly includes two support parts which are respectively arranged at the two end parts of the protective sleeve body, and the support parts support on the upper tube seat base body to play a supporting role for the leaf spring. The anti-hooking component includes a first anti-hooking plate and a second anti-hooking plate. The first anti-hooking plate is arranged on the periphery of the protective sleeve body, and the second anti-hooking plate is arranged between the inner periphery of the protective sleeve body and the leaf spring, which can play a role in protecting the leaf spring from being hooked and knocked. It prevents the fuel assembly from hooking the leaf spring during the hoisting process. Under the action of the anti-hooking component, it avoids the risk of damage to the fuel assembly caused by the untimely extension or shaking of the hook claws during the hoisting of the fuel assembly, and ensures the normal loading and operation of the fuel assembly. Description of the Drawings

[0022] Figure 1Structural schematic diagram of the leaf spring protective sleeve of the fuel assembly provided by the embodiment of the present utility model;

[0023] Figure 2 Front view of the leaf spring protective sleeve of the fuel assembly provided by the embodiment of the present utility model;

[0024] Figure 3 Structural schematic diagram of the cover plate provided by the embodiment of the present utility model.

[0025] Reference numerals:

[0026] 1. Protective sleeve main body; 11. Main body part; 111. First docking surface; 112. Second docking surface; 12. Support part;

[0027] 2. Anti-hook assembly; 21. First anti-hook hanging plate; 22. Second anti-hook hanging plate;

[0028] 3. Support member;

[0029] 4. Insertion tube;

[0030] 5. Cover plate. Detailed implementation manners

[0031] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the convenience of description, only parts related to the present utility model are shown in the drawings, rather than all the structures.

[0032] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but are in contact through other features between them. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0034] In the description of this embodiment, the orientation or positional relationship terms such as "upper", "lower", "left", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, so it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] As Figures 1 - 3 shown, in this embodiment, the fuel assembly leaf spring protection sleeve is sleeved on the leaf spring. The fuel assembly leaf spring protection sleeve includes a protection sleeve body 1, an anti-hooking component 2 and a support component. Among them, the protection sleeve body 1 is in an L-shaped structure. The anti-hooking component 2 includes a first anti-hooking hanging plate 21 and a second anti-hooking hanging plate 22. The first anti-hooking hanging plate 21 is arranged on the periphery of the protection sleeve body 1, and the second anti-hooking hanging plate 22 is arranged between the inner periphery of the protection sleeve body 1 and the leaf spring. The support component includes two support members 3, and the two support members 3 are respectively arranged at both ends of the protection sleeve body 1, and the support member 3 supports on the upper tube seat base body. Specifically, the protection sleeve is made of polyethylene material, has excellent low-temperature resistance and is easy to process. The structure of the protection sleeve body 1 is L-shaped, and can sleeve and protect the leaf spring on the upper tube seat. The second anti-hooking hanging plate 22 and the first anti-hooking hanging plate 21 are respectively arranged on the inner and outer sides of the protection sleeve body 1. Among them, the thicknesses of both the first anti-hooking hanging plate 21 and the second anti-hooking hanging plate 22 are 1 mm. The first anti-hooking hanging plate 21 covers the periphery of the protection sleeve body 1, and the second anti-hooking hanging plate 22 is attached to the inner periphery of the protection sleeve and can be attached to the leaf spring to protect the leaf spring from being hooked and knocked. One support member 3 is arranged on each of the two right-angle outer sides of the protection sleeve body 1. The support member 3 is arranged and supports on the upper tube seat base body, playing a role in supporting the leaf spring. Before hoisting the fuel assembly, the protection sleeve is sleeved on the leaf spring to prevent the fuel assembly from hooking the leaf spring during the hoisting process. Under the action of the anti-hooking component 2, the risk of damage to the fuel assembly caused by the hook claws not extending in time or shaking during the hoisting of the fuel assembly is avoided, ensuring the normal refueling and operation of the fuel assembly.

[0036] Further, referring to Figures 1 - 2, the protective cover body 1 includes two main body parts 11 which are vertically arranged. The inner and outer connection parts of the two main body parts 11 have a first docking surface 111 and a second docking surface 112 respectively. The first docking surface 111 has an arc chamfer, and the second docking surface 112 has a docking right angle. Specifically, the first docking surface 111 on the inner side of the two main body parts 11 is an arc surface structure with an arc radius of 12.7 mm. The second docking surface 112 on the outer side of the two main body parts 11 is a docking right angle structure with an angle of 90 degrees, that is, the two main body parts 11 are perpendicular to each other. The two main body parts 11 of the protective cover body 1 are respectively sleeved on the leaf spring for protection. Among them, the number of the protective cover bodies 1 is set to two, and the two protective cover bodies 1 enclose and seal the leaf spring, playing a certain protective role.

[0037] Further, continue to refer to Figures 1 - 2 , the protective cover body 1 further includes a support part 12. The support part 12 is arranged at the outer connection part of the two main body parts 11, and the support part 12 is fixedly connected to the second docking surface 112. The support part 12 supports on the upper tube seat base body. Specifically, the connection part between the two main body parts 11 is flexibly connected and has certain elastic characteristics to adapt to the dimensional errors of different leaf springs. When the two main body parts 11 respectively abut against the two vertical end faces of the leaf spring, due to the perpendicularity error of the two end faces of individual leaf springs, the two main body parts 11 can be better sleeved on the leaf spring through the flexible connection, and are not easy to break, with a long service life. A support part 12 is arranged between the connection parts of the two main body parts 11. The support part 12 is a square column, and the support part 12 and the two support members 3 form a stable triangular support, further improving the support effect on the leaf spring.

[0038] Further, continue to refer to Figures 1 - 2 , the fuel assembly spring protective cover further includes an insertion tube 4. The insertion tube 4 is arranged at the bottom of the support part 12. The upper tube seat base body has a positioning hole, and the insertion tube 4 is configured to be able to be inserted and fixed with the positioning hole. Specifically, the cross-sectional shape of the insertion tube 4 is an annular structure, that is, the insertion tube 4 is a hollow cylindrical structure. The protective cover is fixedly connected to the upper tube seat base body by inserting the insertion tube 4 into the positioning hole, playing a role in fixing the protective cover, preventing collision and dropping, and having good stability.

[0039] Optionally, the cross-sectional shape of the support member 3 is a triangular structure, that is, the support member 3 is a triangular column, which plays a role in supporting the leaf spring.

[0040] Further, refer to Figures 1 - 3 , the fuel assembly leaf spring protective cover further includes a cover plate 5. The cover plate 5 is covered on the protective cover body 1. Specifically, a cover plate 5 is arranged on the top surface of the protective cover body 1. The main function of the cover plate 5 is to prevent foreign objects from falling, and can also play a certain protective role for the protective cover body 1.

[0041] Further, continue to refer to Figures 1 - 2 , the cover plate 5, the protective sleeve body 1, the anti-hook component 2 and the support component are integrally formed. Specifically, the cover plate 5, the protective sleeve body 1, the anti-hook component 2 and the support component are integrally formed by means of casting or the like, with high structural strength, simple processing and reduced labor maintenance costs.

[0042] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A fuel assembly leaf spring protective sleeve is sleeved on a leaf spring, and is characterized in that The fuel assembly leaf spring protective sleeve includes: A protective sleeve body (1), and the protective sleeve body (1) has an L-shaped structure; An anti-hooking component (2), the anti-hooking component (2) includes a first anti-hooking hanging plate (21) and a second anti-hooking hanging plate (22), the first anti-hooking hanging plate (21) is arranged on the periphery of the protective sleeve body (1), and the second anti-hooking hanging plate (22) is arranged between the inner periphery of the protective sleeve body (1) and the leaf spring; A support component, the support component includes two support members (3), the two support members (3) are respectively arranged at both ends of the protective sleeve body (1), and the support members (3) support on the upper tube seat base body.

2. The fuel assembly leaf spring protective sleeve according to claim 1, characterized in that The protective sleeve body (1) includes two main body parts (11), the two main body parts (11) are vertically arranged, the inner connection part and the outer connection part of the two main body parts (11) respectively have a first docking surface (111) and a second docking surface (112), the first docking surface (111) has an arc chamfer, and the second docking surface (112) has a docking right angle.

3. The fuel assembly leaf spring protective sleeve according to claim 2, wherein, The two main body parts (11) are flexibly connected.

4. The fuel assembly leaf spring protective sleeve according to claim 2, characterized in that The protective sleeve body (1) further includes a support part (12), the support part (12) is arranged at the outer connection part of the two main body parts (11), and the support part (12) is fixedly connected to the second docking surface (112), and the support part (12) supports on the upper tube seat base body.

5. The fuel assembly leaf spring protective sleeve according to claim 4, characterized in that, The fuel assembly spring protective sleeve further includes an insertion tube (4), the insertion tube (4) is arranged at the bottom of the support part (12), the upper tube seat base body has a positioning hole, and the insertion tube (4) is configured to be able to be inserted and fixed with the positioning hole.

6. The fuel assembly leaf spring protective sleeve according to claim 5, characterized in that The cross-sectional shape of the insertion tube (4) is an annular structure.

7. The fuel assembly leaf spring protective sleeve according to claim 1, characterized in that The cross-sectional shape of the support member (3) is a triangular structure.

8. The leaf spring protective sleeve of the fuel assembly according to claim 1, characterized in that The fuel assembly leaf spring protective sleeve further includes a cover plate (5), and the cover plate (5) covers the protective sleeve body (1).

9. The fuel assembly leaf spring protective sleeve according to claim 8, characterized in that, The cover plate (5), the protective sleeve body (1), the anti-hooking component (2) and the support component are integrally formed.

10. The fuel assembly leaf spring protective sleeve according to claim 1, characterized in that, The thicknesses of both the first anti-hooking hanging plate (21) and the second anti-hooking hanging plate (22) are 1 mm.

Images