Foreign matter blocking prevention device for large container of nuclear power station

Abstract

The utility model discloses a nuclear power station large container foreign matter blocking prevention device which comprises two branch cover plates which are rotationally connected together, fixing supporting structures used for fixing and limiting the two branch cover plates are arranged at the positions where the two branch cover plates are close to each other, one end of each fixing supporting structure is connected with one branch cover plate, and the other end of each fixing supporting structure is connected with the other branch cover plate. The other end of the main cover plate is connected with the other sub cover plate; and limiting structures are arranged on the sub cover plates. The foreign matter prevention plugging device for the large container of the nuclear power station is good in passing ability and convenient to carry, and the plugging reliability of a plugging structure is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of plugging structures, and particularly relates to a foreign object prevention plugging device for large containers in a nuclear power plant. Background Art

[0002] The main function of the conventional island is to convert the thermal energy of the steam generated by the nuclear island into the mechanical energy of the steam turbine, and then convert it into electrical energy through the generator.

[0003] The container equipment arranged in the conventional island of the nuclear power plant varies in type and quantity, ranging from condensers and deaerators with a volume of hundreds of cubic meters to various drain containers with a volume of several cubic meters. During each unit overhaul, or during shutdown maintenance, and other maintenance work, it is necessary to open the manhole door of the container to facilitate the entry and exit of personnel. During the period when the manhole door is open for several days, effective foreign object prevention measures must be set up. Otherwise, introducing foreign objects into the system may cause serious harm to the entire secondary circuit.

[0004] The large containers in the conventional island belong to foreign object prevention level I or II areas in the nuclear power plant. There are also areas inside the large containers where personnel or objects may fall. Currently, temporary foreign object prevention measures are generally adopted, such as placing baffles. However, this foreign object prevention structure has defects such as inconvenient positioning, poor sealing, and difficult handling. Content of the Utility Model

[0005] In view of this, the utility model provides a foreign object prevention plugging device for large containers in a nuclear power plant, which has good passability, is convenient for handling, and improves the plugging reliability of the plugging structure.

[0006] To achieve the above object, the utility model provides the following technical solutions:

[0007] A foreign object prevention plugging device for large containers in a nuclear power plant, characterized in that it includes two sub-covers rotatably connected together, and a fixed support structure for fixing and limiting the two sub-covers is arranged at a position where the two sub-covers are close to each other. One end of the fixed support structure is connected to one sub-cover, and the other end is connected to the other sub-cover;

[0008] A limiting structure is arranged on the sub-cover.

[0009] Optionally, the sub-cover is in a semi-circular arc structure, and the two sub-covers are rotatably connected at the diameter position.

[0010] Optionally, the sub-cover includes a top plate and the limiting structure. The limiting structure includes an outer peripheral plate and an inner peripheral plate. The outer peripheral plate and the inner peripheral plate are fixedly arranged on the same end surface of the top plate. The outer peripheral plate and the inner peripheral plate are arranged in parallel at intervals, and the interval distance between the two is greater than the wall thickness of the plugging opening to be plugged.

[0011] Optionally, the peripheral plate is disposed near the edge of the top plate;

[0012] The height of the inner peripheral plate is lower than that of the peripheral plate;

[0013] The top plate is a semi-circular plate.

[0014] Optionally, the fixed support structure includes a locking connection plate, a first connecting screw, and a second connecting screw. The first connecting screw is fixedly connected to one of the split covers, the second connecting screw is fixedly connected to the other split cover, and the locking connection plate is detachably connected to the first connecting screw and / or the second connecting screw.

[0015] Optionally, a first locking nut for pressing the locking connection plate is threadedly connected to the first connecting screw, and a second locking nut for pressing the locking connection plate is threadedly connected to the second connecting screw.

[0016] Optionally, a first stop block is fixedly provided at the end of the first connecting screw away from the split cover, and a second stop block is fixedly provided at the end of the second connecting screw away from the split cover;

[0017] The first locking nut is threadedly connected to the threaded section of the first connecting screw between the first stop block and the locking connection plate, and the second locking nut is threadedly connected to the threaded section of the second connecting screw between the second stop block and the locking connection plate.

[0018] Optionally, a first connection structure for connecting the first connecting screw and a second connection structure for connecting the second connecting screw are provided on the locking connection plate;

[0019] Wherein, the first connection structure is a connection through-hole, and the second connection structure is an open connection slot;

[0020] Or, both the first connection structure and the second connection structure are open connection slots.

[0021] Optionally, the two split covers are rotatably connected by a socketed pin shaft and a sleeve, and one of the pin shaft and the sleeve is fixedly connected to one of the split covers, and the other is fixedly connected to the other split cover;

[0022] Or, the two split covers are connected by a hinge.

[0023] Optionally, there are two fixed support structures, and the two fixed support structures are symmetrically arranged about the central position of the plugging device.

[0024] As can be seen from the above technical solution, the large container foreign object prevention and plugging device for nuclear power plants provided by the present utility model forms a foldable plugging structure by arranging two sub-cover plates rotatably connected together, which facilitates the plugging device to enter and exit the manhole door of the container in the conventional island, has good passability and is convenient for handling. By arranging a fixed support structure on the two sub-cover plates, it is convenient to fix and limit the two sub-cover plates when they are fully unfolded, so that the plugging structure is transformed from a folded state to an unfolded state, which is convenient for plugging use. By arranging the limiting structure on the sub-cover plate to limit the plugging structure, the position movement of the sub-cover plate in the plugging state is avoided, thereby realizing the positioning of the plugging structure and ensuring the sealing tightness of the plugging structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 Structural schematic diagram of the large container foreign object prevention and plugging device for nuclear power plants provided by an embodiment of the present utility model from one angle;

[0027] Figure 2 Structural schematic diagram of the large container foreign object prevention and plugging device for nuclear power plants provided by an embodiment of the present utility model from another angle;

[0028] Figure 3 Installation position schematic diagram of the large container foreign object prevention and plugging device for nuclear power plants provided by an embodiment of the present utility model and the plugging opening;

[0029] Figure 4 Structural schematic diagram of the fixed support structure provided by an embodiment of the present utility model;

[0030] Figure 5 Structural schematic diagram of the locking connecting plate provided by an embodiment of the present utility model;

[0031] Figure 6 Structural schematic diagram of the locking connecting plate provided by another embodiment of the present utility model;

[0032] Figure 7 Structural schematic diagram of a sub-cover plate provided by an embodiment of the present utility model from one angle;

[0033] Figure 8 For Figure 7 Structural schematic diagram of the sub-cover plate provided in [] from another angle;

[0034] Figure 9 Structural schematic diagram of the split cover plate provided by another embodiment of the present utility model from an angle;

[0035] Figure 10 is Figure 9 Structural schematic diagram of the split cover plate provided in from another angle.

[0036] Wherein:

[0037] 1. Inner peripheral plate, 2. Top plate, 3. Outer peripheral plate, 4. Fixed support structure, 401. First stop block, 402. Second stop block, 403. First locking nut, 404. Second locking nut, 405. First connecting screw rod, 406. Second connecting screw rod, 407. Locking connection plate, 4071. Connection through hole, 4072. Open connection card slot, 5. Rotating connection structure, 501. Pin shaft, 502. Sleeve, 6. Sealing port. Specific embodiments

[0038] The present utility model discloses a foreign object prevention and sealing device for large containers in nuclear power plants, which has good passability, is convenient for handling, and improves the sealing reliability of the sealing structure.

[0039] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0040] Refer to Figures 1 to 10 , the foreign object prevention and sealing device for large containers in nuclear power plants of the present utility model includes two split cover plates rotatably connected together. A fixed support structure 4 for fixing and limiting the two split cover plates is provided at the positions where the two split cover plates are close to each other. One end of the fixed support structure 4 is connected to one split cover plate, and the other end is connected to the other split cover plate. A limiting structure is provided on the split cover plate, and the limiting structure is used to limit the sealing of the split cover plate to prevent the position movement of the split cover plate in the sealed state.

[0041] Wherein, the two split cover plates are spliced into a structure for sealing the sealing port 6 of the container. The two split cover plates are rotatably connected through a rotating connection structure 5. The two split cover plates form a sealing structure after being unfolded. The sealing port 6 is the orifice of the container. Since the holes on the container are generally circular, the split cover plates are in a semi-circular arc structure, and the two split cover plates are rotatably connected at the diameter positions to form a circular sealing structure.

[0042] The large container foreign object prevention and plugging device for nuclear power plants of the present utility model forms a foldable plugging structure by arranging two sub-cover plates rotatably connected together, which facilitates the plugging device to enter and exit the manhole door of the container in the conventional island and is convenient for handling. By arranging a fixed support structure 4 on the two sub-cover plates, it is convenient to fix and limit the two sub-cover plates when they are fully unfolded, so that the plugging structure is transformed from a folded state to an unfolded state for plugging use. By arranging the limiting structure on the sub-cover plate to limit the plugging structure, the position movement of the sub-cover plate in the plugging state is avoided, thereby realizing the positioning of the plugging structure and ensuring the sealing tightness of the plugging structure.

[0043] Specifically, the sub-cover plate includes a top plate 2 and the limiting structure connected to the top plate 2. The limiting structure includes an outer peripheral plate 3 and an inner peripheral plate 1. The outer peripheral plate 3 and the inner peripheral plate 1 are fixedly arranged on the same end surface of the top plate 2. The outer peripheral plate 3 is sleeved outside the inner peripheral plate 1. The outer peripheral plate 3 and the inner peripheral plate 1 are arranged in parallel at intervals, and the distance between them is greater than the wall thickness of the plugging opening 6 to be plugged. Thus, when the plugging device is covered on the plugging opening 6, the plugging opening 6 is between the outer peripheral plate 3 and the inner peripheral plate 1, as Figure 3 shown, so that the plugging device can be prevented from falling from the plugging opening 6 in the horizontal direction, preventing the plugging device from moving around and ensuring the plugging reliability of the plugging device. The top plate 2 is made of lightweight aluminum alloy material and is used to cover the orifice inside the large container in the nuclear power plant.

[0044] Furthermore, the outer peripheral plate 3 is arranged close to the edge of the top plate 2. The outer peripheral plate 3 and the inner peripheral plate 1 are welded to the top plate 2. The height of the inner peripheral plate 1 is lower than the height of the outer peripheral plate 3. The height of the two refers to the distance between the surfaces far from the top plate 2 and the top plate 2. Since the container manhole door in the general conventional island is generally circular, the top plate 2 is a semi-circular plate, and two opposite top plates 2 are spliced to form a circular cover plate structure. The inner peripheral plate 1 can be a single piece arranged on the sub-cover plate, as Figure 7 and Figure 8 shown. The length of the inner peripheral plate 1 is less than the length of the outer peripheral plate 3, or it can be multiple pieces arranged on the sub-cover plate, as Figure 9 and Figure 10 shown, and no limitation is made here.

[0045] Among them, the fixed support structure 4 includes a locking connection plate 407, a first connection screw 405 and a second connection screw 406. The first connection screw 405 is fixedly connected to one sub-cover plate, the second connection screw 406 is fixedly connected to the other sub-cover plate, and the locking connection plate 407 is detachably connected to the first connection screw 405 and / or the second connection screw 406. The fixed connection here can be welding or other connection methods commonly used by those skilled in the art, and no limitation is made here.

[0046] To facilitate the connection of the locking connecting plate 407, a first connection structure for connecting the first connecting screw 405 and a second connection structure for connecting the second connecting screw 406 are provided on the locking connecting plate 407.

[0047] In one embodiment, the first connection structure is a connection through-hole 4071, and the second connection structure is an open connection slot 4072, as Figure 5 shown. In this embodiment, the first connecting screw 405 passes through the connection through-hole 4071, that is, the locking connecting plate 407 is rotatably connected to the first connecting screw 405, and the second connecting screw 406 is clamped in the open connection slot 4072. To press the locking connecting plate 407, a first locking nut 403 is threadedly connected to the first connecting screw 405, and a second locking nut 404 is threadedly connected to the second connecting screw 406. The first locking nut 403 and the second locking nut 404 press the locking connecting plate 407, so that the two sub-cover plates become a sealing structure in the same plane. In this embodiment, the locking connecting plate 407 is detachably connected to the second connecting screw 406 and rotatably connected to the first connecting screw 405. During loading and unloading, only the locking connecting plate 407 needs to be rotated around the first connecting screw 405 so that it disengages from the second connecting screw 406 at the open connection slot 4072 end, and the disassembly of the two sub-cover plates can be realized. This connection structure is convenient for disassembly and assembly, improving the loading and unloading efficiency.

[0048] To prevent the locking connecting plate 407 from falling off the first connecting screw 405, a first stop block 401 is fixedly provided at the end of the first connecting screw 405 away from the sub-cover plate, and the first stop block 401 is welded to the end of the first connecting screw 405. A second stop block 402 is fixedly provided at the end of the second connecting screw 406 away from the sub-cover plate, and the second stop block 402 is welded to the end of the second connecting screw 406. By welding the first stop block 401 at the end of the first connecting screw 405, the locking connecting plate 407 is prevented from falling off the first connecting screw 405, reducing the number of components. It can be understood that the first locking nut 403 is threadedly connected to the threaded section of the first connecting screw 405 between the first stop block 401 and the locking connecting plate 407, and the second locking nut 404 is threadedly connected to the threaded section of the second connecting screw 406 between the second stop block 402 and the locking connecting plate 407. By setting the stop block structure, the first locking nut 403 and the second locking nut 404 are also prevented from falling off their respective corresponding screws, reducing the total number of components.

[0049] In other embodiments, the structure of connecting the screw and the stop block can also be replaced as a whole with a bolt, which is not limited here.

[0050] In another embodiment, both the first connection structure and the second connection structure may also be open connection card slots 4072, as Figure 6 shown. In this embodiment, the connection is achieved through two open connection card slots 4072. Although this structure is convenient for disassembly and assembly, the locking connection plate 407 is prone to being lost.

[0051] Wherein, the two sub-cover plates are rotatably connected through a socketed pin shaft 501 and a sleeve 502. One of the pin shaft 501 and the sleeve 502 is fixedly connected to one sub-cover plate, and the other is fixedly connected to the other sub-cover plate, so as to facilitate the rotational connection of the two sub-cover plates. In other embodiments, the two sub-cover plates may also be connected by hinges, which is not limited herein.

[0052] To improve the stability of the plugging, there are two fixed support structures 4, and the two fixed support structures 4 are symmetrically arranged about the central position of the plugging device.

[0053] The large container foreign object prevention plugging device of the nuclear power plant of the present utility model includes two sub-cover plates rotatably connected together, so that the plugging device can be folded, improving the passability of the plugging device and enabling it to enter and exit the orifices of most large containers. After entering the container interior, the two sub-cover plates are unfolded and covered on the orifice, and the two sub-cover plates are connected and fixed through the locking connection plate 407 of the fixed support structure 4, and the locking connection plate 407 is locked and fixed using a locking nut, finally realizing the function of preventing foreign objects.

[0054] The large container foreign object prevention plugging device of the nuclear power plant of the present utility model replaces the operation of erecting a scaffold inside the container in the conventional island for preventing foreign objects, reducing the labor intensity of the operators, improving the work efficiency, having a simple structure, good passability of the plugging device, being convenient for installation and disassembly, and having reliable plugging.

[0055] In the description of this solution, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to this solution.

[0056] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this solution, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0057] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0058] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for preventing foreign matter from blocking large containers in nuclear power plants, characterized in that: It comprises two sub-cover plates connected together in rotation, wherein a fixed support structure for fixing and limiting the two sub-cover plates is arranged at positions where the two sub-cover plates are close to each other, and one end of the fixed support structure is connected to one of the sub-cover plates, and the other end is connected to the other sub-cover plate; The sub-cover plate is provided with a limiting structure.

2. The device for preventing foreign matter from blocking large containers in nuclear power plants according to claim 1, characterized in that: The sub-cover plates are semicircular arc structures, and the diameter positions of the two sub-cover plates are rotatably connected.

3. The device for preventing foreign matter from blocking a large container in a nuclear power plant according to claim 1 or 2, characterized in that: The sub-cover plate includes a top plate and the limiting structure, the limiting structure includes an outer plate and an inner plate, the outer plate and the inner plate are fixedly arranged on the same end surface of the top plate, the outer plate and the inner plate are arranged in parallel and spaced apart, and the spacing distance between the two is greater than the wall thickness of the sealing port to be sealed.

4. The device for preventing foreign matter from blocking large containers in nuclear power plants according to claim 3, characterized in that: The peripheral plate is disposed close to the edge of the top plate; The height of the inner panel is lower than that of the outer panel; The top plate is a semicircular plate.

5. The device for preventing foreign matter from blocking large containers in nuclear power plants according to claim 1, characterized in that: The fixed support structure includes a locking connecting plate, a first connecting screw and a second connecting screw, wherein the first connecting screw is fixedly connected to one of the sub-cover plates, the second connecting screw is fixedly connected to the other sub-cover plate, and the locking connecting plate is detachably connected to the first connecting screw and / or the second connecting screw.

6. The device for preventing foreign matter from blocking large containers in nuclear power plants according to claim 5, characterized in that: The first connecting screw is threadedly connected with a first locking nut for tightening the locking connecting plate, and the second connecting screw is threadedly connected with a second locking nut for tightening the locking connecting plate.

7. The device for preventing foreign matter from blocking large containers in nuclear power plants according to claim 6, characterized in that: A first stopper is fixedly provided at the end of the first connecting screw away from the sub-cover plate, and a second stopper is fixedly provided at the end of the second connecting screw away from the sub-cover plate; The first locking nut is threadedly connected to the threaded section of the first connecting screw between the first stopper and the locking connecting plate, and the second locking nut is threadedly connected to the threaded section of the second connecting screw between the second stopper and the locking connecting plate.

8. The device for preventing foreign matter from blocking large containers in nuclear power plants according to claim 5, characterized in that: The locking connecting plate is provided with a first connecting structure for connecting the first connecting screw, and is also provided with a second connecting structure for connecting the second connecting screw; Wherein, the first connection structure is a connection through hole, and the second connection structure is an open connection slot; Alternatively, both the first connection structure and the second connection structure are open connection slots.

9. The device for preventing foreign matter from blocking large containers in nuclear power plants according to claim 1, characterized in that: The two sub-cover plates are rotatably connected via a sleeved pin and a sleeve, one of the pin and the sleeve is fixedly connected to one of the sub-cover plates, and the other is fixedly connected to the other sub-cover plate; Alternatively, the two partial cover plates are connected by a hinge.

10. The device for preventing foreign matter from blocking large containers in nuclear power plants according to claim 1, characterized in that: There are two fixed support structures, and the two fixed support structures are centrally symmetrically arranged about the center position of the blocking device.

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