Fastener for top cover of reactor pressure vessel of nuclear power station
By designing a highly adaptable fastener structure, the problem of poor applicability of fasteners for the top cover of nuclear power plant reactor pressure vessels with different thicknesses has been solved, achieving highly flexible adjustment and wide applicability, and reducing replacement costs and spare parts requirements.
Patent Information
- Application Number
- CN202423093152.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-16
AI Technical Summary
Existing fasteners for the top cover of nuclear power plant reactor pressure vessels have limited thread height when dealing with covers of different thicknesses, making it impossible to adjust the holding height accordingly, resulting in poor applicability.
A fastener was designed that includes a clamp, a through rod, a fixed shaft, a threaded rod, a rubber pad, a clamping plate, and a rotating plate. The clamp height can be flexibly adjusted through the movable connection of the clamping plate and the rotating plate to adapt to the fastening requirements of hatch covers of different thicknesses.
It enables effective clamping of hatch covers of different thicknesses, broadens the applicable range of fasteners, reduces the frequency of fastener replacement and the pressure of spare parts reserves, is easy to operate and does not affect the clamping function, and adapts to various working conditions.
Smart Images
Figure CN223578392U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the related technical field of hatch fastener, specifically relates to a fastener for nuclear power station reactor pressure vessel top cover. BACKGROUND
[0002] The fastener for nuclear power station reactor pressure vessel top cover is very important. In the operation of the nuclear power station, the pressure vessel needs to be tightly closed, and the top cover fastener bears the key role of ensuring sealing and bearing high temperature and high pressure. The quality thereof is related to the safe and stable operation of the whole reactor, and once looseness or other problems occur, serious consequences such as leakage of radioactive substances can be caused. With the development of nuclear power technology, the performance requirements such as strength and corrosion resistance of the fastener are continuously improved, and the research and development and quality control thereof are always the key contents concerned in the nuclear power field.
[0003] The existing fastener for nuclear power station reactor pressure vessel top cover has limited height of the threaded rod when facing different thickness hatch covers, cannot adjust the holding height in a targeted manner, lacks the structure for adjusting the holding height, and has poor applicability when used for different thickness hatch covers. UTILITY MODEL CONTENTS
[0004] The utility model discloses a kind of fasteners for nuclear power station reactor pressure vessel top cover, to solve the fastener for existing nuclear power station reactor pressure vessel top cover in the background art described above When facing different thickness hatch covers, the height of the threaded rod is limited, cannot adjust the holding height in a targeted manner, lacks the structure for adjusting the holding height, and has poor applicability when used for different thickness hatch covers Problem.
[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of fastener for nuclear power station reactor pressure vessel top cover, including chuck and through rod;
[0006] The fixed shaft is arranged at the connecting position of the through rod and the chuck, the threaded rod is arranged at the upper side position of the through rod, and the fixed nut is arranged at the outer position of the threaded rod.
[0007] The rubber pad is arranged at the outer position of the through rod.
[0008] The inner slot is formed at the inner position of the upper two ends of the chuck, the clamping plate is arranged at the rear end position of the inner slot, the front end of the clamping plate is connected with the rotating plate, the connecting hole is formed at the inner position of the rotating plate, and the clamping hole is formed at the inner position of the upper two ends of the inner slot.
[0009] Preferably, the clamping plate is connected with the chuck by movable connection, and the clamping plate can rotate in the inner slot.
[0010] Preferably, the rotating plate is provided with a movable shaft at the connecting position with the clamping plate, and the clamping plate can rotate on the rotating plate through the movable shaft.
[0011] Preferably, a through hole is arranged at the connecting position between the front upper side of the clamping head and the inner groove, and the through hole has a larger diameter than the cross section of the clamping plate.
[0012] Preferably, the clamping head can rotate at a certain angle on the lower side of the penetrating rod through a fixed shaft, and the fixed nut can move up and down on the threaded rod through the thread.
[0013] Preferably, the upper side of the rubber pad is provided with an upper gasket, and the lower side of the rubber pad is provided with a lower gasket.
[0014] Compared with the prior art, the utility model provides a fastener for nuclear power plant reactor pressure vessel top cover, has the following beneficial effects:
[0015] The utility model discloses a rotating plate, clamping plate, inner groove, connecting hole, card hole, through hole and movable shaft are arranged, and the following advantages can be achieved:
[0016] Adapting to different hatch thicknesses: by means of the clamping plate can rotate in the inner groove, the rotating plate can rotate on the clamping plate through the movable shaft, and the connecting hole and the card hole are connected with the connecting bolt, the overall height of the clamping head can be increased as required. In this way, the nuclear power plant reactor pressure vessel top cover (hatch) of different thicknesses can be effectively clamped, the application range of the fastener is greatly widened, the fastener does not need to be frequently replaced with different specifications due to the difference in hatch thickness, and the use cost and the reserve pressure of spare parts are reduced.
[0017] Convenient adjustment: in actual use, the operator can flexibly rotate and fix the rotating plate, clamping plate and other components according to the actual thickness of the hatch on site, quickly adjust the height of the clamping head, and the whole operation process is relatively simple, without the aid of complex tools or professional skills, the fastening demand under different working conditions can be conveniently and quickly met.
[0018] Easy function switching: when the height adjustment function is not needed, the rotating plate and the clamping plate can be easily rotated back to the original position, so that the clamping head can normally clamp, and the function switching is very easy, and the actual use scene can be better coped with.
[0019] Avoid space obstruction: through the design of the through hole, when not using the height adjustment function, the rotating plate can pass through the through hole and make its height lower than the upper side of the chuck, effectively avoiding the space obstruction of these movable parts to the overall structure and clamping operation when not needing to play a specific function, so that the entire fastener can better fit in the limited space around the top cover of the pressure vessel during installation and use, maintaining the compactness of the structure and not occupying too much unnecessary space due to additional components. BRIEF DESCRIPTION OF DRAWINGS
[0020] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, together with the embodiments of the present application, to explain the present application, and do not constitute a limitation on the present application, in the drawings:
[0021] Figure 1 A fastener structure for a nuclear power plant reactor pressure vessel top cover is proposed for the present application;
[0022] Figure 2 In the present application Figure 1 Structure schematic diagram of right side view;
[0023] Figure 3 In the present application Figure 1 Structure schematic diagram of rear side view;
[0024] Figure 4 In the present application Figure 1 Structure schematic diagram of left side view;
[0025] Figure 5 Structure schematic diagram of rear side fastener of top view angle in the present application;
[0026] Figure 6 In the present application Figure 5 Structure schematic diagram of enlarged inner circular area;
[0027] In the figure: 1, fixed nut; 2, threaded rod; 3, through rod; 4, upper gasket; 5, rubber pad; 6, lower gasket; 7, chuck; 8, fixed shaft; 9, movable shaft; 10, rotating plate; 11, clamping hole; 12, clamping plate; 13, through hole; 14, connecting hole; 15, inner groove. DETAILED DESCRIPTION
[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0029] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0031] Please see Figures 1-6 This utility model provides a fastener technical solution for the top cover of a nuclear power plant reactor pressure vessel: a fastener for the top cover of a nuclear power plant reactor pressure vessel, including a clamp 7 and a through rod 3;
[0032] A fixed shaft 8 is provided at the connection position between the through rod 3 and the clamp 7, a threaded rod 2 is provided on the upper side of the through rod 3, and a fixed nut 1 is provided on the outer side of the threaded rod 2;
[0033] A rubber pad 5 is provided on the outer side of the through rod 3;
[0034] The upper two ends of the chuck 7 are respectively provided with inner grooves 15. The rear end of the inner groove 15 is provided with a clamping plate 12. The front end of the clamping plate 12 is connected to a rotating plate 10. Multiple connecting holes 14 are provided on the inner side of the rotating plate 10. The upper sides of the two ends of the inner groove 15 are provided with clamping holes 11.
[0035] An upper gasket 4 is provided on the upper side of the rubber pad 5, and a lower gasket 6 is provided on the lower side of the rubber pad 5.
[0036] In this embodiment, the fixed nut 1 is connected to the threaded rod 2 by threads. When a rotating force is applied to the fixed nut 1, it can move up and down along the threaded rod 2 due to the characteristics of threads. In actual use, by tightening the fixed nut 1, it can move downward along the threaded rod 2, thereby playing a tightening role and further pressing and fixing the relevant components; when the fixed nut 1 is loosened, it can move upward, facilitating disassembly and other operations.
[0037] The chuck 7 can rotate at a certain angle on the lower side of the through rod 3 through the fixed shaft 8. This rotating mode allows the chuck 7 to flexibly adjust the angle according to actual installation needs, better adapt to the installation of the pressure vessel top cover and the connection with other components, and ensure that the entire fastener can be in a suitable position state under different working conditions and installation scenarios, thereby assisting in realizing the function of fastening connection.
[0038] The rubber pad 5 is arranged on the outer side of the through rod 3, and the upper gasket 4 and the lower gasket 6 are arranged on the upper side and the lower side of the rubber pad 5, respectively. The upper gasket 4 can better disperse the pressure when the fixed nut 1 is tightened, preventing the fixed nut 1 from causing local excessive extrusion damage to the surface of the contacted component; the lower gasket 6 can also play a role in dispersing pressure, avoiding damage between the chuck 7 and the contacted component due to pressure concentration. The rubber pad 5 itself can utilize its elastic properties to play a role in buffering, shock absorption, and filling small gaps to a certain extent, thereby enhancing the stability and sealing performance of the entire fastener during connection, and ensuring reliable operation in the application scenario of the nuclear power plant reactor pressure vessel top cover fastening.
[0039] As shown in Figures 1-6 The clamping plate 12 is connected to the chuck 7 by a movable connection mode, and the clamping plate 12 can rotate in the inner groove 15. The rotating plate 10 is provided with a movable shaft 9 at the connection position with the clamping plate 12, and the clamping plate 12 can rotate on the rotating plate 10 through the movable shaft 9. The chuck 7 is provided with a through hole 13 at the connection position between the inner groove 15 and the inner side of the front upper side, and the caliber of the through hole 13 is larger than the cross section of the clamping plate 12. The chuck 7 can rotate at a certain angle on the lower side of the through rod 3 through the fixed shaft 8, and the fixed nut 1 can move up and down on the threaded rod 2 through threads.
[0040] Preferably, when the user needs to use the device for fastening operation in the face of different thicknesses of hatch covers, first, the clamping plate 12 is connected to the chuck 7 by a movable connection mode, and the clamping plate 12 is rotated upward out of the inner groove 15 of the chuck 7, so that it is away from the original position in the inner groove 15, and is ready for subsequent adjustment.
[0041] Rotating the rotating plate to coincide with the hole position: then, through the movable shaft 9 located at the connecting position of the clamping plate 12 and the rotating plate 10, the rotating plate 10 can be rotated on the clamping plate 12, the angle of the rotating plate 10 is adjusted, until the clamping hole 11 on the rotating plate 10 and the multiple connecting holes 14 opened by itself coincide, and the hole position is aligned for subsequent fixing with connecting bolts.
[0042] Fixed height adjustment: after the hole position coincides, the connecting bolt is externally penetrated through the connecting hole 14 and the clamping hole 11, so as to clamp and fix the rotating plate 10 on the inner groove 15 at a specific height and angle. Due to the combination and fixing mode of the rotating plate 10 and the clamping plate 12, the overall height of the chuck 7 can be effectively improved, so that the effective clamping effect can be realized for the hatch cover with relatively low thickness, and the fastening demand of the hatch cover with different thickness can be met.
[0043] When the function of increasing the height of the chuck by the rotating plate and the clamping plate is not needed, the clamping plate 12 and the rotating plate 10 can be manually rotated respectively to restore them to the initial position state which does not affect the normal clamping, that is, the end of the rotating plate 10 can pass through the through hole 13 opened at the connecting position of the inner groove 15 and the upper side of the chuck 7, and the height of the rotating plate 10 is lower than the upper side of the chuck 7.
[0044] Realize non-interference clamping: after such rotation reset, the rotating plate 10 and the clamping plate 12 will not hinder the normal clamping function of the chuck 7, and guarantee that the fastener can smoothly play a role in the conventional case or for other thickness suitable hatch cover fastening operation.
[0045] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. A fastener for the top cover of a reactor pressure vessel in a nuclear power plant, comprising a clamp (7) and a through rod (3); A fixed shaft (8) is provided at the connection position of the through rod (3) and the clamp (7), a threaded rod (2) is provided on the upper side of the through rod (3), and a fixed nut (1) is provided on the outer side of the threaded rod (2). A rubber pad (5) is provided on the outer side of the through rod (3); Its features are: The upper two ends of the clamp (7) are respectively provided with inner grooves (15), and a retaining plate (12) is provided at the rear end of the inner groove (15). The front end of the retaining plate (12) is connected to a rotating plate (10). Multiple connecting holes (14) are provided on the inner side of the rotating plate (10). The upper sides of the two ends of the inner groove (15) are provided with retaining holes (11).
2. A fastener for the top cover of a nuclear power plant reactor pressure vessel according to claim 1, characterized in that: The card plate (12) is connected to the clamp (7) via a movable connection, and the card plate (12) can rotate within the inner groove (15).
3. A fastener for the top cover of a nuclear power plant reactor pressure vessel according to claim 2, characterized in that: The rotating plate (10) is provided with a movable shaft (9) at the connection position with the clamping plate (12), and the clamping plate (12) can rotate on the rotating plate (10) via the movable shaft (9).
4. A fastener for the top cover of a nuclear power plant reactor pressure vessel according to claim 3, characterized in that: A through hole (13) is provided at the connection between the upper front side of the clamp (7) and the inner groove (15), and the diameter of the through hole (13) is larger than the cross-section of the clamp plate (12).
5. A fastener for the top cover of a nuclear power plant reactor pressure vessel according to claim 4, characterized in that: The clamp (7) can rotate at a certain angle on the underside of the through rod (3) via the fixed shaft (8), and the fixed nut (1) can move up and down on the threaded rod (2) via the thread.
6. A fastener for the top cover of a nuclear power plant reactor pressure vessel according to claim 1, characterized in that: An upper gasket (4) is provided on the upper side of the rubber pad (5), and a lower gasket (6) is provided on the lower side of the rubber pad (5).