Anti-loose fastener for nuclear power engineering

Abstract

The utility model belongs to the technical field of fasteners, and particularly relates to an anti-loose fastener for nuclear power engineering, comprising: a screw body comprising a limiting part and a rod part, the rod part being provided with a thread; the mounting groove is formed in the limiting part, and the section of the mounting groove is hexagonal; one end of the through hole penetrates through the limiting part, and the other end of the through hole penetrates through the rod part; the locking rod is movably arranged in the through hole; the locking piece is arranged in the rod part, is matched with the locking rod and can move in the vertical direction of the radial extension of the rod part; when the locking piece moves outwards, the screw body can be locked, and when the locking piece moves inwards, locking is relieved. The anti-loosening fastener for the nuclear power engineering has the beneficial effects that the screw body is used for fastening components of nuclear power engineering equipment, and loosening of the components is prevented.

Description

Technical Field

[0001] This application belongs to the field of fastener technology, and particularly relates to an anti-loosening fastener for nuclear power engineering. Background Technology

[0002] Bolts are a common type of fastener widely used in various fields. They are also used in the connection of assembly parts such as reactor pressure vessels and pressurizers in nuclear power plants to ensure normal operation within the reactor pressure vessel and achieve the goal of safe operation of the nuclear power plant.

[0003] Existing nuclear power plant equipment, operating under high temperature, high pressure, and high radioactivity conditions, may experience loosening or even detachment of bolts due to various factors such as water flow erosion, equipment vibration, or impact from foreign objects entering the system. If these loose bolts are not tightened or replaced, continued operation in such a high-temperature, high-pressure, high-flow-rate, and highly radioactive environment will pose safety hazards to the equipment and system, and could even lead to nuclear safety accidents. Therefore, improvements are needed. Summary of the Invention

[0004] The purpose of this application is to provide an anti-loosening fastener for nuclear power engineering that can solve the above-mentioned problems.

[0005] The purpose of this application is to provide an anti-loosening fastener for nuclear power engineering, comprising:

[0006] The screw body includes a limiting part and a shank, and the shank is provided with threads;

[0007] The mounting groove is provided on the limiting part, and its cross-section is hexagonal;

[0008] A through hole is provided inside the rod, with one end penetrating the limiting part and the other end penetrating the rod;

[0009] The locking lever is movably installed inside the through hole;

[0010] A locking element, disposed within the rod and engaging with the locking lever, is capable of moving in a vertical direction extending radially along the rod.

[0011] The locking element can lock the screw body when it moves outward, and unlock it when it moves inward.

[0012] The aforementioned anti-loosening fastener for nuclear power engineering uses a screw body to fasten components of nuclear power engineering equipment, preventing them from loosening. This avoids the equipment from loosening or even falling off due to water erosion, equipment vibration, or impact from foreign objects under high temperature, high pressure, and high radioactivity operating conditions, which could lead to safety hazards in equipment and system operation or even nuclear safety accidents.

[0013] Before use, the screw body is in an unlocked state, meaning the locking element and locking rod are locked. The locking element is not in contact with the inner wall of the hole where the screw is installed, and the locking rod is not deep into the through hole. After the screw body is fixed, press the locking rod with the appropriate tool to make the locking rod go deep into the through hole and squeeze the locking element, causing it to move in the vertical direction along the radial extension of the rod. At this time, the locking element contacts the inner wall of the hole where the screw is installed, completing the locking and achieving the anti-loosening effect.

[0014] Meanwhile, due to the presence of the locking rod, even if the middle of the screw body breaks, the locking rod will continue to play a locking role, preventing the components of the nuclear power plant that need to be tightened from becoming loose, and further enhancing the safety of equipment operation.

[0015] Furthermore, the locking element includes two locking balls, which are symmetrically located on both sides of the locking lever, and the lever is provided with a moving channel for the locking balls to move.

[0016] The movement of the locking lever causes the locking ball to move within the movement channel, thus switching the locking ball between locked and unlocked states. Simultaneously, two symmetrically installed locking balls move to both sides under the movement of the locking lever, one end contacting and pressing against the inner wall of the screw mounting hole, while the other end contacts and lubricates the locking lever, thereby preventing loosening. Furthermore, the combined effect of the two locking balls ensures a better and more even locking effect.

[0017] Furthermore: the locking lever includes:

[0018] The diameter of the force-applying part is larger than the diameter of the through hole;

[0019] The long rod portion is disposed within the through hole and includes a smooth section, a recessed section, and a limiting section;

[0020] The recessed section engages with the locking ball. When the locking ball contacts the recessed section, the screw body is in an unlocked state. When the locking ball contacts the smooth section, the screw body is in a locked state.

[0021] The recessed section of the long lever engages with the locking ball to create an unlocked state. Locking is achieved when the locking lever moves and the locking ball contacts the smooth section. When the locking ball contacts the recessed section of the locking lever, it is in the unlocked state. This segmented design makes the locking and unlocking process more precise and controllable. Furthermore, by ensuring the diameter of the force-applying section is larger than the diameter of the through-hole, the operator can easily control the locking lever with tools, thereby changing the position of the locking ball and switching between the unlocked and locked states.

[0022] In addition, the design of the limiting section ensures the position of the locking lever, so that the recessed section remains in contact with the locking ball when it is in the initial state, i.e., the unlocked state, thereby ensuring the accuracy of subsequent locking and avoiding failure to lock.

[0023] Furthermore, the end of the rod away from the limiting part is provided with a limiting groove adapted to the limiting section. This prevents the locking rod from disengaging from the through hole.

[0024] The combination of the limiting section and the limiting groove prevents the locking rod from disengaging from the through hole, thus avoiding the user from applying reverse force to pull the locking rod out of the through hole, further enhancing the overall structural stability of the fastener. At the same time, the limiting groove ensures that the locking rod will not accidentally disengage during operation, preventing accidental unlocking due to the locking rod disengaging, allowing operators to perform locking operations with greater peace of mind.

[0025] Furthermore, the mounting groove is provided with multiple locking folds, which can press the force-applying part by bending.

[0026] By incorporating multiple locking plates on the mounting slot and pressing the force-applying part through bending, the locking rod can be effectively prevented from dislodging from the through hole due to external forces (such as strong vibration or impact), thus improving the structural reliability of the fastener. This dual anti-dislodgement mechanism significantly reduces the risk of failure caused by the locking rod falling off, especially under extreme conditions such as high temperature, high pressure, and high radioactivity environments. This improvement is crucial for ensuring the long-term stable operation of the equipment.

[0027] Furthermore, after the screw body and locking rod are installed, the locking plate can be easily pressed against the applied force by a simple bending operation, eliminating the need for complicated tools or procedures and simplifying the post-installation process. The locking plate here is made of a bendable metal material similar to that used for fasteners.

[0028] Furthermore, multiple locking folding plates are provided, and the multiple locking folding plates are evenly distributed in a ring around the through hole.

[0029] Multiple locking plates are arranged in a ring around the through hole, providing a multi-point clamping effect. Compared with single-point or local clamping, it can more effectively resist vibration, impact or thermal stress from any direction, and prevent the locking rod from shifting or falling off due to uneven force.

[0030] Furthermore, the force-applying part, the smooth section, the recessed section, and the limiting section are an integral structure, and a smooth section is provided between the recessed section and the limiting section.

[0031] In this application, the force-applying section, smooth section, recessed section, and limiting section are manufactured using an integrated molding process, eliminating the risk of stress concentration and fatigue cracking that may occur due to welding or threaded connections in traditional split structures. Simultaneously, a smooth section is added between the recessed section and the limiting section, forming a gradient structure of "force-applying section-smooth section-recessed section-smooth section-limiting section," which ensures a more uniform stress distribution on the locking rod during movement, preventing easy breakage due to abrupt structural changes.

[0032] The beneficial effects of this application are:

[0033] 1. The above-mentioned anti-loosening fastener for nuclear power engineering is used to fasten the components of nuclear power engineering equipment to prevent them from loosening. This avoids the equipment from loosening or even falling off due to water flow erosion, equipment vibration, foreign object impact, etc., under high temperature, high pressure and high radioactivity operating conditions, which could lead to safety hazards in equipment and system operation, or even nuclear safety accidents.

[0034] 2. Due to the presence of the locking rod, even if the middle of the screw body breaks, the locking rod will continue to play a locking role, preventing the components of the nuclear power plant that need to be fastened from becoming loose, and further enhancing the safety of equipment operation.

[0035] 3. By setting multiple locking folds on the mounting groove, the force-applying part is pressed by bending operation, which can effectively prevent the locking rod from coming out of the through hole due to external force (such as strong vibration, impact, etc.), thus improving the structural reliability of the fastener. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of this utility model;

[0037] Figure 2 This is a schematic diagram of the structure of this utility model after it is assembled with components of nuclear power engineering equipment;

[0038] Figure 3 This is a schematic diagram of the screw body of this utility model in a locked state;

[0039] Figure 4 yes Figure 3 A magnified view of A in the middle.

[0040] The reference numerals in the figure are as follows: 100, screw body; 110, limiting part; 120, rod part; 121, limiting groove; 200, mounting groove; 300, through hole; 400, locking rod; 410, force-applying part; 420, long rod part; 421, smooth section; 422, recessed section; 423, limiting section; 500, locking element; 510, locking ball; 520, moving channel; 600, locking folding plate. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0042] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0043] The following description, in conjunction with the accompanying drawings, details the anti-loosening fasteners for nuclear power engineering provided in this application through specific embodiments and application scenarios.

[0044] Example 1:

[0045] like Figures 1 to 3 As shown in the figure, this application provides an anti-loosening fastener for nuclear power engineering, comprising:

[0046] The screw body 100 includes a limiting part 110 and a shank part 120, and the shank part 120 is provided with threads;

[0047] The mounting groove 200 is provided on the limiting part 110, and its cross-section is hexagonal.

[0048] A through hole 300 is provided inside the rod 120, with one end passing through the limiting part 110 and the other end passing through the rod 120;

[0049] The locking lever 400 is movably installed within the through hole 300;

[0050] The locking element 500 is disposed within the rod portion 120 and cooperates with the locking rod 400, and can move in a vertical direction extending radially along the rod portion 120;

[0051] The locking element 500 can lock the screw body 100 when it moves outward, and release the lock when it moves inward.

[0052] In some embodiments of this application, such as Figure 1 As shown, the above-mentioned anti-loosening fastener for nuclear power engineering uses a screw body 100 to fasten the components of nuclear power engineering equipment to prevent them from loosening. This avoids the equipment from loosening or even falling off due to water flow erosion, equipment vibration, foreign object impact, etc., under high temperature, high pressure and high radioactivity operating conditions, which could lead to safety hazards in equipment and system operation, or even cause nuclear safety accidents.

[0053] Before use, the screw body 100 is in an unlocked state, that is, the locking member 500 and the locking rod 400 are in a locked state. The locking member 500 is not in contact with the inner wall of the hole where the screw is installed. At this time, the locking rod 400 is not deep into the through hole 300. After the screw body 100 is fixed, the locking rod 400 is pressed with a corresponding tool to make the locking rod 400 go deep into the through hole 300 and squeeze the locking member 500, so that it moves along the vertical direction of the radial extension of the rod 120. At this time, the locking member 500 contacts the inner wall of the hole where the screw is installed, and the locking is completed, which has the effect of preventing loosening.

[0054] Meanwhile, due to the presence of the locking rod 400, even if the middle of the screw body 100 breaks, the locking rod 400 will continue to play a locking role, preventing the components of the nuclear power plant that need to be fastened from becoming loose, and further enhancing the safety of equipment operation.

[0055] Example 2:

[0056] This application provides an anti-loosening fastener for nuclear power engineering. In addition to the above-mentioned technical features, the anti-loosening fastener for nuclear power engineering in this application also includes the following technical features.

[0057] like Figures 1 to 3 As shown, the locking member 500 includes two locking balls 510, which are symmetrically located on both sides of the locking lever 400, and the lever 120 is provided with a moving channel 520 for the locking balls to move.

[0058] In this embodiment, the movement of the locking lever 400 causes the locking ball to move within the moving channel 520, thereby switching the locking ball between locked and unlocked states. Simultaneously, two symmetrically installed locking balls move to both sides under the movement of the locking lever 400, with one end contacting and pressing against the inner wall of the screw mounting hole, and the other end contacting and lubricating the locking lever 400, thus achieving an anti-loosening effect. Furthermore, the effect of the two locking balls makes the locking effect better and more even.

[0059] Example 3:

[0060] This application provides an anti-loosening fastener for nuclear power engineering. In addition to the above-mentioned technical features, the anti-loosening fastener for nuclear power engineering in this application also includes the following technical features.

[0061] like Figure 2 and Figure 3 As shown, the locking lever 400 includes:

[0062] The force-applying part 410 has a diameter larger than that of the through hole 300;

[0063] The long rod portion 420 is disposed within the through hole 300 and includes a smooth section 421, a recessed section 422, and a limiting section 423.

[0064] The recessed section 422 engages with the locking ball. When the locking ball contacts the recessed section 422, the screw body 100 is in an unlocked state. When the locking ball contacts the smooth section 421, the screw body 100 is in a locked state.

[0065] In this embodiment, the recessed section 422 of the long rod 420 engages with the locking ball to form an unlocked state. When the locking rod 400 moves and the locking ball contacts the smooth section 421, locking is achieved. When the locking ball contacts the recessed section 422 of the locking rod 400, it is in the unlocked state. This segmented design makes the locking and unlocking process more precise and controllable. Simultaneously, by making the diameter of the force-applying part 410 larger than the diameter of the through hole 300, the operator can easily control the locking rod 400 with tools, thereby changing the position of the locking ball and switching between the unlocked and locked states.

[0066] In addition, the design of the limiting section 423 ensures the position of the locking lever 400 so that the recessed section 422 remains in contact with the locking ball when it is in the initial state, i.e., the unlocked state, thereby ensuring the accuracy of subsequent locking and avoiding failure to lock.

[0067] Furthermore, a limiting groove 121 adapted to the limiting section 423 is provided at the end of the rod portion 120 away from the limiting portion 110. This prevents the locking rod 400 from disengaging from the through hole 300.

[0068] The cooperation of the limiting segment 423 and the limiting groove 121 prevents the locking rod 400 from disengaging from the through hole 300, thus avoiding the user from applying reverse force to pull the locking rod 400 out of the through hole 300, further enhancing the overall structural stability of the fastener. At the same time, the limiting groove 121 ensures that the locking rod 400 will not accidentally disengage during operation, thereby preventing accidental unlocking due to the locking rod 400 disengaging, allowing operators to perform locking operations with greater peace of mind.

[0069] Furthermore, the force-applying part 410, the smooth section 421, the recessed section 422, and the limiting section 423 are integrated into one structure, and a smooth section 421 is also provided between the recessed section 422 and the limiting section 423.

[0070] In this application, the force-applying section 410, the smooth section 421, the recessed section 422, and the limiting section 423 are integrally molded, eliminating the risk of stress concentration and fatigue cracking that may occur due to welding or threaded connections in traditional split structures. Simultaneously, a smooth section 421 is added between the recessed section 422 and the limiting section 423, forming a gradient structure of "force-applying section 410 - smooth section 421 - recessed section 422 - smooth section 421 - limiting section 423," which makes the stress distribution of the locking rod 400 more uniform during movement, avoiding easy breakage due to structural abrupt changes.

[0071] Example 4:

[0072] This application provides an anti-loosening fastener for nuclear power engineering. In addition to the above-mentioned technical features, the anti-loosening fastener for nuclear power engineering in this application also includes the following technical features.

[0073] like Figures 2 to 4 As shown, the mounting groove 200 is provided with multiple locking folding plates 600, which can press the force-applying part 410 by bending.

[0074] In this embodiment, by providing multiple locking baffles 600 on the mounting groove 200, the force-applying part 410 is pressed together through bending operations, effectively preventing the locking rod 400 from dislodging from the through hole 300 due to external forces (such as strong vibration or impact), thus improving the structural reliability of the fastener. This dual anti-dislodgement mechanism significantly reduces the risk of failure caused by the locking rod 400 falling off, especially under extreme conditions such as high temperature, high pressure, and high radioactivity environments. This improvement is crucial for ensuring the long-term stable operation of the equipment.

[0075] Meanwhile, after the screw body 100 and locking rod 400 are installed, the locking plate 600 can be pressed against the force-applying part 410 by a simple bending operation, without the need for complicated tools or operating procedures, thus simplifying the post-installation processing. The locking plate 600 here is made of a bendable metal material, similar to fastener material.

[0076] Furthermore, multiple locking folding plates 600 are provided, and the multiple locking folding plates 600 are evenly distributed in a ring around the through hole 300.

[0077] Multiple locking plates 600 are arranged in a ring around the through hole 300, providing a multi-point clamping effect. Compared with single-point or local clamping, it can more effectively resist vibration, impact or thermal stress from any direction, and prevent the locking rod 400 from shifting or falling off due to uneven force.

[0078] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0079] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A type of anti-loosening fastener for nuclear power engineering, characterized in that: include: The screw body (100) includes a limiting part (110) and a shank (120), and the shank (120) is provided with threads; The mounting groove (200) is provided on the limiting part (110) and its cross-section is hexagonal; A through hole (300) is provided inside the rod (120), with one end passing through the limiting part (110) and the other end passing through the rod (120); A locking lever (400) is movably disposed within a through hole (300); The locking element (500) is disposed inside the rod (120) and cooperates with the locking rod (400), and can move in a vertical direction extending radially along the rod (120); The locking element (500) can lock the screw body (100) when it moves outward, and unlock it when it moves inward.

2. The anti-loosening fastener for nuclear power engineering according to claim 1, characterized in that: The locking element (500) includes two locking balls (510), which are symmetrically located on both sides of the locking lever (400), and the lever (120) is provided with a moving channel (520) for the locking balls (510) to move.

3. The anti-loosening fastener for nuclear power engineering according to claim 2, characterized in that: The locking lever (400) includes: The force-applying part (410) has a diameter larger than that of the through hole (300); The long rod portion (420) is disposed within the through hole (300) and includes a smooth section (421), a recessed section (422) and a limiting section (423); The recessed section (422) cooperates with the locking ball. When the locking ball contacts the recessed section (422), the screw body (100) is in the unlocked state. When the locking ball contacts the smooth section (421), the screw body (100) is in the locked state.

4. The anti-loosening fastener for nuclear power engineering according to claim 3, characterized in that: The end of the rod (120) away from the limiting part (110) is provided with a limiting groove (121) that is adapted to the limiting section (423).

5. The anti-loosening fastener for nuclear power engineering according to claim 4, characterized in that: The mounting groove (200) is provided with a plurality of locking folds (600), which can press the force-applying part (410) by bending.

6. The anti-loosening fastener for nuclear power engineering according to claim 5, characterized in that: Multiple locking folds (600) are provided, and the multiple locking folds (600) are evenly distributed in a ring around the through hole (300).

7. The anti-loosening fastener for nuclear power engineering according to claim 3, characterized in that: The force-applying part (410), the smooth section (421), the recessed section (422) and the limiting section (423) are an integral structure, and a smooth section (421) is also provided between the recessed section (422) and the limiting section (423).

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