AP / CAP series steam generator water chamber blocking plate sealing assembly

Abstract

The utility model belongs to the technical field of equipment special for overhauling steam generators of AP / CAP series pressurized water reactor nuclear power plants, and discloses a water chamber blocking plate sealing assembly of an AP / CAP series steam generator. Comprising blocking plates which are symmetrically arranged and hinged to each other, an air bag connecting piece is arranged at the bottom of each blocking plate, a plurality of sealing grooves are sequentially formed in the surface of the circumferential face of each air bag connecting piece from top to bottom, and each sealing groove is sleeved with a first sealing air bag, a second sealing air bag and a third sealing air bag. The diameter of the first sealing air bag is larger than that of the second sealing air bag and that of the third sealing air bag, and the section of the first sealing air bag is of a conical structure, so that the contact area between the section of the conical structure of the first sealing air bag and a pipe nozzle is larger and larger under the action of extrusion when the air pressure of the whole device is increased due to the action of working air pressure in the using process; and in cooperation with a second sealing air bag and a third sealing air bag, the sealing effect of the whole device is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of special equipment for the maintenance of steam generators in AP / CAP series pressurized water reactor nuclear power plants, specifically an AP / CAP series steam generator water chamber plug sealing assembly. Background Technology

[0002] The steam generator is one of the core components of the reactor coolant system in a pressurized water reactor (PWR) nuclear power plant. It transfers heat generated by the reactor to the secondary side of the steam generator. The generated steam is then dried by primary and secondary steam-water separators before driving a turbine generator to produce electricity. During operation, the steam generator plays a crucial role in steam production, radioactive containment, and core heat removal, making it essential for the safe and stable operation of the nuclear power plant. Connected to the reactor pressure vessel, the steam generator marks the boundary between the primary and secondary loops of the PWR nuclear power plant. After the coolant absorbs the heat released from nuclear fuel fission in the reactor core, it transfers this heat to the secondary loop through the steam generator to produce steam. This high-temperature, high-pressure steam then drives the turbine to generate electricity. The steam generator not only facilitates heat transfer and conversion but also acts as a barrier against radioactive heat transfer fluid, ensuring the safe operation of the nuclear power plant.

[0003] When the steam generator is under in-service inspection, the nozzle at the connection between the steam generator and the primary circuit must be sealed to prevent radioactive gas or liquid from being ejected from the nozzle due to the working pressure caused by the liquid level difference, which could cause injury to maintenance personnel. It can also prevent any foreign objects from falling into the primary side main pipeline.

[0004] Existing patent document CN107965620A discloses a steam generator water chamber end cap nozzle plug, comprising a support plate, an air bladder, a control system, and connecting pipelines. The support plate includes a left plate, a middle plate, and a right plate, with the left and right plates connected to the middle plate via hinges. The air bladder covers the bottom surface of the support plate and extends along its side edges, secured to the sides of the left and right plates by fasteners. The air bladder comprises three layers: an active sealing chamber, a secondary sealing chamber, and a primary sealing chamber, arranged sequentially from the side facing the support plate to the other. The control system communicates with the air bladder and an external air source via connecting pipelines, controlling the inflation and deflation of the connecting pipelines. This invention's water chamber end cap nozzle plug is foldable for quick and easy installation and sealing, and features three sealing chambers—three safety backups—significantly reducing the probability of equipment failure and improving equipment safety. The entire system can be disassembled and cleaned separately, has a long service life, and saves considerable costs. However, during use, the active sealing chamber, secondary sealing chamber, and primary sealing chamber, which have identical structures, will cause the entire device to shift a considerable distance during use due to working pressure, affecting maintenance personnel's ability to inspect and repair the steam generator. Utility Model Content

[0005] The purpose of this invention is to provide a sealing assembly for the water chamber plug of an AP / CAP series steam generator to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An AP / CAP series steam generator water chamber plug sealing assembly includes a plug plate, and an airbag connector is provided around the bottom of the plug plate. The outer circumferential surface of the airbag connector is provided with a first sealing airbag, a second sealing airbag and a third sealing airbag. The diameter of the first sealing airbag in the free state is larger than the diameter of the second sealing airbag and the third sealing airbag in the free state.

[0008] More preferably, the blocking plates are symmetrically arranged and hinged to each other, the surface of the blocking plates is provided with a pressing chamber and a clamping plate structure, the airbag connector is provided with a plurality of sealing grooves from top to bottom, and a first sealing airbag, a second sealing airbag and a third sealing airbag are sleeved on the outside of the sealing groove, the cross section of the first sealing airbag is a conical structure.

[0009] More preferably, the blocking plate and the airbag connector are provided with through holes at the positions corresponding to the sealing grooves on their sides. Each through hole is provided with an air pipe, and one end of the air pipe is connected to the first sealing airbag, the second sealing airbag and the third sealing airbag, and the other end of the air pipe is connected to an external air source through the compression chamber.

[0010] More preferably, the surface of the blocking plate is provided with a plurality of cavities evenly distributed by the partition plates, and a reinforcing rib is provided between two adjacent partition plates.

[0011] More preferably, each cavity has a mounting hole at its center, and the airbag connector is fastened to the blocking plate by a connecting rod passing through the mounting hole and a fastening nut.

[0012] More preferably, the outer edge of the blocking plate is provided with an outwardly protruding protrusion, and the top outer edge of the airbag connector is provided with a groove, the protrusion and the groove being connected to each other.

[0013] More preferably, a handle is provided inside the cavity symmetrically arranged on the surfaces of the two blocking plates, and the two ends of the handle are respectively connected to two adjacent partition plates.

[0014] More preferably, the clamping plate structure includes a base plate connected to the surface of the blocking plate, a pull-back plate fixedly connected to the surface of the base plate, and torsion spring fixing cavities symmetrically arranged on the surface of the pull-back plate. The clamping plate is connected inside the torsion spring fixing cavity through a torsion spring and a torsion spring shaft.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] The circumferential surface of the airbag connector is provided with multiple sealing grooves from top to bottom. A first sealing airbag, a second sealing airbag, and a third sealing airbag are fitted around the outer side of each sealing groove. The first sealing airbag has a conical cross-section, and its diameter is larger than that of the second and third sealing airbags. Because of the larger diameter and conical cross-section of the first sealing airbag, during use, as the working air pressure increases, the contact area between the conical cross-section of the first sealing airbag and the nozzle increases under pressure, thus increasing its stability. Combined with the second and third sealing airbags, this improves the sealing effect of the entire device. Attached Figure Description

[0017] Figure 1 This is a top view of the overall structure of this utility model;

[0018] Figure 2 This is a front view of the overall structure of this utility model;

[0019] Figure 3 This is a three-dimensional structural diagram of the blocking plate of this utility model;

[0020] Figure 4 This is a three-dimensional structural diagram of the airbag connector of this utility model;

[0021] Figure 5 This is a three-dimensional schematic diagram of the card plate structure of this utility model;

[0022] In the diagram: 1. Blocking plate; 2. Divider plate; 3. Reinforcing rib; 4. Handle; 5. Pressing chamber; 6. Clamping plate structure; 601. Base plate; 602. Pull-back plate; 603. Torsion spring fixing cavity; 604. Clamping plate; 7. Fastening nut; 8. Airbag connector; 9. First sealing airbag; 10. Second sealing airbag; 11. Third sealing airbag; 12. Connecting rod; 13. Sealing groove; 14. Groove; 15. Protrusion; 16. Testing chamber. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-2 This utility model provides a technical solution:

[0025] An AP / CAP series steam generator water chamber plug sealing assembly includes symmetrically arranged plug plates 1 that are hinged to each other. The surface of the plug plate 1 is provided with a pressure chamber 5 and a clamping plate structure 6. The bottom of the plug plate 1 is provided with an airbag connector 8. The circumferential surface of the airbag connector 8 is provided with multiple sealing grooves 13 from top to bottom. A first sealing airbag 9, a second sealing airbag 10, and a third sealing airbag 11 are sleeved on the outside of the sealing grooves 13. The cross-section of the first sealing airbag 9 is conical, and the diameter of the first sealing airbag 9 in its free state is larger than the diameters of the second sealing airbag 10 and the third sealing airbag 11 in their free state. The free state refers to the state when the airbag is in equilibrium with the external air pressure. That is to say, the second sealing airbag 10 and the third sealing airbag 11 achieve sealing after being inflated, while the first sealing airbag 9 achieves sealing in its free state. After being deflated, it contracts and loses its sealing function. Therefore, by using the first sealing airbag 9, which has a diameter larger than the second sealing airbag 10 and the third sealing airbag 11 in its free state and has a conical cross-section, the first sealing airbag 9 can increase its stability during use due to the working air pressure. As the air pressure increases, the contact area between the conical cross-section of the first sealing airbag 9 and the nozzle will increase under the pressure. This, combined with the second sealing airbag 10 and the third sealing airbag 11, further improves the sealing effect of the entire device.

[0026] In this invention, the blocking plate 1 and the airbag connector 8 have through holes corresponding to the sealing groove 13 on their sides. Each through hole contains an air pipe, with one end of the air pipe connected to the first sealing airbag 9, the second sealing airbag 10, and the third sealing airbag 11, and the other end of the air pipe passing through the compression chamber 5 and connected to an external air source. A one-way valve is installed between the air pipe and the external air source to ensure that the first sealing airbag 9, the second sealing airbag 10, and the third sealing airbag 11 can still function as a seal even if the air source is cut off. A detection chamber 16 is also provided between the second sealing airbag 10 and the third sealing airbag 11, and the detection chamber 16 is also connected to an air pipe. The air pipe is connected to the detection chamber 16, and once the second sealing airbag 10 and the third sealing airbag 11 lose pressure, the air pipe connected to the detection chamber 16 will send back an alarm signal. After the entire device has been used, manually open the one-way valves on the air pipes corresponding to the first sealing airbag 9, the second sealing airbag 10, and the third sealing airbag 11 to perform the exhaust operation, reduce the volume of the first sealing airbag 9, the second sealing airbag 10, and the third sealing airbag 11, and make them easier to remove.

[0027] In this invention, the surface of the blocking plate 1 is evenly provided with multiple cavities by partition plates 2, and a reinforcing rib 3 is provided between two adjacent partition plates 2. Each cavity has a mounting hole at its center, and the airbag connector 8 is fastened to the blocking plate 1 by a connecting rod 12 passing through the mounting hole and a fastening nut 7. The outer edge of the blocking plate 1 has an outwardly protruding protrusion 15, and the outer edge of the top of the airbag connector 8 has a groove 14, with the protrusion 15 and groove 14 engaging with each other. Handles 4 are also provided inside the symmetrically arranged cavities on the surfaces of the two blocking plates 1, with each end of the handle 4 connected to one of the two adjacent partition plates 2. The multiple grooves 14, in conjunction with the protrusions 15, can position the blocking plate 1 and the airbag connector 8. Simultaneously, the multiple mounting holes, the connecting rod 12 connected inside the mounting holes, and the fastening nut 7 can fasten the blocking plate 1 and the airbag connector 8 together.

[0028] In this utility model, the card plate structure 6 includes a base plate 601 connected to the surface of the blocking plate 1, a pull-back plate 602 fixedly connected to the surface of the base plate 601, and torsion spring fixing cavities 603 symmetrically arranged on the surface of the pull-back plate 602. The card plate 604 is connected inside the torsion spring fixing cavity 603 through a torsion spring and a torsion spring shaft.

[0029] Example: In use, the entire device can be folded into a smaller volume by the symmetrically arranged hinged blocking plates 1. When placed in the installation position, the blocking plates 1 can be unfolded under the action of the hinges to form the following shape. Figure 1The structure is shown. A handle 4 is installed inside the cavities symmetrically arranged on the surfaces of the two blocking plates 1. The two ends of the handle 4 are connected to two adjacent partition plates 2, facilitating the installation and disassembly of the entire device by maintenance personnel. The outer edge of the blocking plate 1 has outwardly protruding bumps 15, and the outer edge of the top of the airbag connector 8 has a groove 14. The bumps 15 and grooves 14 cooperate to connect. Multiple grooves 14, in conjunction with the bumps 15, can position the blocking plate 1 and the airbag connector 8. Simultaneously, in conjunction with multiple mounting holes and connecting rods 12 and fastening nuts 7 connected inside the mounting holes, the blocking plate 1 and the airbag connector 8 can be securely connected together. Next, the other end of the air pipe connecting the first sealing airbag 9, the second sealing airbag 10, and the third sealing airbag 11 is passed through the crimping chamber 5 and connected to an external air source. The one-way valve between the air pipe and the external air source is opened, and air is injected into the first sealing airbag 9, the second sealing airbag 10, and the third sealing airbag 11 through the external air source and the air pipe, so that the entire device is fixedly connected to the inside of the main pipeline. At the same time, when the device is in the unfolded state and enters the main pipeline, the clamping plate 604 will contact the side wall of the pipeline. Under the action of the torsion spring and the torsion spring shaft inside the torsion spring fixing chamber 603, the clamping plate 604 will flip towards the center of the blocking plate 1. When the entire device is installed in the slot at the interface of the main pipeline, the clamping plate 604 will automatically flip towards the slot under the action of the torsion spring and the torsion spring shaft. Finally, the clamping plate 604 and the slot are connected together, so that the entire device is fixed at the interface of the main pipeline.

[0030] A one-way valve is installed between the trachea and the external air source to ensure that the first sealing airbag 9, the second sealing airbag 10, and the third sealing airbag 11 can still maintain their sealing function even if the air source is cut off. A detection chamber 16 is also provided between the second sealing airbag 10 and the third sealing airbag 11, and the detection chamber 16 is also connected to a trachea. If the second sealing airbag 10 or the third sealing airbag 11 loses pressure, the trachea connected to the detection chamber 16 will send back an alarm signal. After the entire device is used, the one-way valves on the tracheas corresponding to the first sealing airbag 9, the second sealing airbag 10, and the third sealing airbag 11 can be manually opened to vent air, reducing the volume of the first sealing airbag 9, the second sealing airbag 10, and the third sealing airbag 11 for easy removal. By using a first sealing airbag 9 with a diameter larger than that of the second sealing airbag 10 and the third sealing airbag 11 and a conical cross-section, the first sealing airbag 9 can increase its stability during use due to the working air pressure. As the air pressure increases, the contact area between the conical cross-section of the first sealing airbag 9 and the nozzle will increase under the pressure. This, combined with the second sealing airbag 10 and the third sealing airbag 11, further improves the sealing effect of the entire device.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sealing assembly for a water chamber plug of an AP / CAP series steam generator, comprising a plug (1), characterized in that, The bottom of the blocking plate (1) is provided with an airbag connector (8). The outer circumferential surface of the airbag connector (8) is provided with a first sealing airbag (9), a second sealing airbag (10) and a third sealing airbag (11). The diameter of the first sealing airbag (9) in the free state is greater than the diameter of the second sealing airbag (10) and the third sealing airbag (11) in the free state.

2. The AP / CAP series steam generator water chamber plug sealing assembly according to claim 1, characterized in that: The blocking plates (1) are symmetrically arranged and hinged to each other. The surface of the blocking plates (1) is provided with a pressing chamber (5) and a clamping plate structure (6). The airbag connector (8) is provided with multiple sealing grooves (13) from top to bottom. The sealing grooves (13) are fitted with a first sealing airbag (9), a second sealing airbag (10) and a third sealing airbag (11) on the outside. The first sealing airbag (9) has a conical cross-section.

3. The AP / CAP series steam generator water chamber plug sealing assembly according to claim 2, characterized in that: The blocking plate (1) and the airbag connector (8) are provided with through holes corresponding to the sealing groove (13) on their sides. Each through hole is provided with an air pipe. One end of the air pipe is connected to the first sealing airbag (9), the second sealing airbag (10) and the third sealing airbag (11), and the other end of the air pipe is connected to an external air source through the crimping chamber (5).

4. The AP / CAP series steam generator water chamber plug sealing assembly according to claim 2, characterized in that: The surface of the blocking plate (1) is uniformly provided with multiple cavities through the partition plate (2), and a reinforcing rib (3) is provided between two adjacent partition plates (2).

5. The AP / CAP series steam generator water chamber plug sealing assembly according to claim 4, characterized in that: Each cavity has a mounting hole at its center. The airbag connector (8) is fastened to the block plate (1) by a connecting rod (12) that passes through the mounting hole and a fastening nut (7).

6. The AP / CAP series steam generator water chamber plug sealing assembly according to claim 1, characterized in that: The outer edge of the blocking plate (1) is provided with an outward protrusion (15), and the top outer edge of the airbag connector (8) is provided with a groove (14). The protrusion (15) and the groove (14) are connected to each other.

7. The AP / CAP series steam generator water chamber plug sealing assembly according to claim 4, characterized in that: A handle (4) is provided inside the cavity symmetrically arranged on the surfaces of the two blocking plates (1), and the two ends of the handle (4) are respectively connected to two adjacent partition plates (2).

8. The AP / CAP series steam generator water chamber plug sealing assembly according to claim 2, characterized in that: The card plate structure (6) includes a base plate (601) connected to the surface of the blocking plate (1). A pull-back plate (602) is fixedly connected to the surface of the base plate (601). A torsion spring fixing cavity (603) is symmetrically arranged on the surface of the pull-back plate (602). A card plate (604) is connected inside the torsion spring fixing cavity (603) through a torsion spring and a torsion spring shaft.

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