Protection device for flow nozzle of hanging basket assembly of civil nuclear reactor internals

Abstract

A protection device for a civil nuclear reactor internal hanging basket assembly flow pipe nozzle comprises a protection pipe cover, a connecting column is vertically arranged on the lower end face of the protection cover, a threaded column is arranged at the lower end of the connecting column, an internal thread is arranged at a port of a flow pipe body, and the protection cover is in threaded connection with the flow pipe body through the threaded column. A protective airbag is arranged on the inner wall of the protective cover, and a pressing airbag is arranged on the upper end face of the protective cover; according to the flow pipe nozzle, internal support and external protection can be provided for the thin-wall part of the flow pipe nozzle in the long-time storage and transportation process, so that the pipe wall damage and deformation phenomena caused by extrusion or collision are effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear equipment, in particular to a protection device for a flow nozzle of a hanging basket assembly of a nuclear reactor internal component. Background Art

[0002] In the design and manufacture of modern civilian nuclear pressurized water reactors (PWRs), the core component basket assembly, as a key component within the reactor pressure vessel, performs a crucial function. The flow nozzle, a key component of the basket assembly, plays a vital role in bridging the cooling water flow path between the upper and lower core components. This component is typically made of relatively soft austenitic stainless steel, measuring only 0.47 mm thick at its thinnest point. Due to its unique thin-walled tube design, the flow nozzle is extremely susceptible to external influences during long-term storage and transportation. Even slight squeezing or collisions can cause surface damage, deformation, or dimensional deviation, resulting in product rejection.

[0003] Currently, ensuring the integrity of precision components like flow nozzles from production to installation at nuclear power equipment installation sites is a pressing technical challenge. Traditional methods for protecting flow nozzles are inadequate, particularly in preventing damage and deformation to the tube wall caused by interplay between components. These issues not only increase equipment installation costs but also potentially extend the installation cycle of critical reactor internals, hindering the overall construction schedule of the nuclear power plant. Utility Model Content

[0004] In view of the above problems, the technical problem to be solved by the present invention is to provide a protective device for the flow nozzle of the hanging basket assembly of the internal components of the nuclear power plant. The device can provide internal support and external protection for the thin-walled part of the flow nozzle during long-term storage and transportation, thereby effectively preventing the occurrence of damage and deformation of the pipe wall caused by extrusion or collision.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A protective device for the flow nozzle of a hanging basket assembly of an internal component of a nuclear power plant, comprising a protective tube cover, a connecting column vertically arranged at the lower end surface of the protective cover, a threaded column arranged at the lower end of the connecting column, an internal thread arranged at the port of a flow tube body, the protective cover being threadedly connected to the flow tube body via the threaded column, a protective airbag arranged at the inner wall of the protective cover, and a pressing airbag arranged at the upper end surface of the protective cover.

[0007] In a preferred solution, the protective airbag includes a top airbag and a side airbag. The top airbag is installed on the top surface of the protective cover, and the side airbag is installed on the inner side wall of the protective cover. The top airbag and the side airbag are connected to each other.

[0008] In a preferred solution, a mounting groove is provided on the top of the connecting column, a one-way air guide cylinder is vertically provided in the mounting groove, and both sides of the mounting groove are connected to the top airbag.

[0009] In the preferred solution, an air inlet is provided on the top of the one-way air guide cylinder and is connected to the pressing airbag, an air outlet is provided on the side of the one-way air guide cylinder and is connected to the mounting slot, and a telescopic plate that can move up and down is provided inside the one-way air guide cylinder, and a compression spring is connected to the telescopic plate and the bottom of the mounting slot.

[0010] In a preferred solution, the pressure airbag is connected to an air inlet pipe, and the side airbag is connected to an air outlet pipe, the air outlet pipe extends to the outside of the protective cover, and an opening and closing switch is provided on the air inlet pipe and the air outlet pipe.

[0011] A protective device for the flow nozzle of a hanging basket assembly of a nuclear reactor internals has the following beneficial effects during actual use:

[0012] 1. By setting up protective airbags, especially the top airbag and side airbag design, a full-range buffer layer can be formed inside the flow nozzle, effectively absorbing impact forces from all directions, thereby avoiding damage to the thin-wall structure of the flow nozzle caused by extrusion and collision that may occur during storage and transportation;

[0013] 2. The protective device designed in this utility model has a simple structure and is easy to assemble and disassemble. The protective cover can be quickly connected to the flow tube body through a threaded connection. At the same time, the design of the press-fit airbag allows the user to inflate and deflate the airbag with a simple press, simplifying the operation steps and improving work efficiency.

[0014] 3. The successful application of this device has reduced the damage rate of flow nozzles during transportation and storage, reduced the additional costs caused by replacing damaged parts, shortened the installation cycle of the internal components of the civil nuclear power plant, and improved the economic benefits of the overall project. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0016] Figure 1 This is a schematic diagram of the installation effect of the utility model;

[0017] Figure 2 This is a schematic diagram of the overall structure of the utility model;

[0018] Figure 3 This is a cross-sectional view of the internal structure of the utility model;

[0019] Figure 4 This is a planar cross-sectional view of the airbag inflation component structure of the utility model.

[0020] In the figure: protective cover 1, connecting column 2, flow tube body 3, internal thread 4, pressing airbag 5, air inlet pipe 6, air outlet pipe 7, threaded column 8, side airbag 9, top airbag 10, mounting groove 11, one-way air guide 12, air outlet 13, air inlet 14, telescopic plate 15, compression spring 16. DETAILED DESCRIPTION

[0021] like Figure 1 As shown, a protection device for the flow nozzle of the hanging basket assembly of the internal component of the nuclear reactor of the People's Republic of China is provided, including a protection tube cover, a connecting column 2 is vertically arranged at the lower end surface of the protection cover 1, a threaded column 8 is provided at the lower end of the connecting column 2, an internal thread 4 is provided at the port of the flow tube body 3, the protection cover 1 is threadedly connected to the flow tube body 3 through the threaded column 8, a protection airbag is provided on the inner wall of the protection cover 1, and a pressing airbag 5 is provided at the upper end surface of the protection cover 1.

[0022] The preferred solution is Figure 3 As shown, the protective airbag includes a top airbag 10 and a side airbag 9. The top airbag 10 is installed on the top surface of the protective cover 1, and the side airbag 9 is installed on the inner wall of the protective cover 1. The top airbag 10 and the side airbag 9 are connected to each other. By arranging the top airbag 10 and the side airbag 9, the port thin-walled tube of the flow tube body 3 can be cushioned and protected to prevent damage to the thin-walled structure of the flow tube nozzle due to extrusion and collision during transportation.

[0023] The preferred solution is Figure 4 As shown, a mounting groove 11 is provided at the top of the connecting column 2 , a one-way air guide cylinder 12 is vertically provided in the mounting groove 11 , and both sides of the mounting groove 11 are connected to the top airbag 10 .

[0024] The preferred solution is Figure 4 As shown, an air inlet 14 is provided at the top of the one-way air guide 12 and is connected to the pressing airbag 5. An air outlet 13 is provided at the side of the one-way air guide 12 and is connected to the mounting slot 11. A telescopic plate 15 that moves up and down is provided inside the one-way air guide 12. A compression spring 16 is connected to the telescopic plate 15 and the bottom of the mounting slot 11.

[0025] When the protective airbag needs to be inflated, the air inlet pipe 6 is first opened and the air outlet pipe 7 is closed. When the pressing airbag 5 is pressed downward, the telescopic plate 15 moves downward and compresses the compression spring 16. External air passes through the air inlet pipe 6, the air inlet port 14 and the air outlet 13 to inflate the top airbag 10 and the side airbag 9. After the pressing airbag 5 is released, the telescopic plate 15 slides upward under the action of the compression spring 16. At this time, the air outlet 13 is in a blocked state, and external air passes through the air inlet pipe 6 to inflate the pressing airbag 5.

[0026] By providing a one-way air guide 12 and cooperating with the pressing air bag 5, the protective air bag can be pressed and inflated, which simplifies the operation steps and the inflation and deflation structure and improves work efficiency.

[0027] The preferred solution is Figure 2 As shown, the pressure airbag 5 is connected to an air inlet pipe 6, and the side airbag 9 is connected to an air outlet pipe 7. The air outlet pipe 7 extends to the outside of the protective cover 1, and an opening and closing switch is provided on the air inlet pipe 6 and the air outlet pipe 7.

[0028] The working principle of the device is as follows:

[0029] 1. When the flow tube body 3 needs to be transported and stored, the protective cover 1 is installed at the end of the flow tube body 3 so that the threaded column 8 is threadedly connected to the flow tube body 3 to complete the initial fixation;

[0030] 2. Open the air inlet pipe 6 and close the air outlet pipe 7, then repeatedly press the airbag 5. At this time, external air inflates the top airbag 10 and the side airbag 9 through the air pipe 6, the air inlet 14 and the air outlet 13. After the top airbag 10 and the side airbag 9 are inflated, they cushion and protect the thin wall of the flow nozzle of the flow tube body 3;

[0031] 3. When the protective cover 1 needs to be removed, it is only necessary to open the air outlet pipe 7, release the gas in the top airbag 10 and the side airbag 9, and then unscrew the protective cover 1 from the flow tube body 3.

Claims

1. A protective device for a flow nozzle of a nuclear reactor internals hanging basket assembly, comprising a protective nozzle cover, characterized in that: A connecting column (2) is vertically provided at the lower end surface of the protective cover (1), a threaded column (8) is provided at the lower end of the connecting column (2), an internal thread (4) is provided at the port of the flow tube body (3), the protective cover (1) is threadedly connected to the flow tube body (3) through the threaded column (8), a protective airbag is provided at the inner wall of the protective cover (1), and a pressing airbag (5) is provided at the upper end surface of the protective cover (1).

2. The protective device for the flow nozzle of the hanging basket assembly of the nuclear reactor internals according to claim 1, characterized in that: The protective airbag comprises a top airbag (10) and a side airbag (9), wherein the top airbag (10) is arranged on the top surface of the protective cover (1), and the side airbag (9) is arranged on the inner side wall of the protective cover (1), and the top airbag (10) and the side airbag (9) are connected to each other.

3. The protective device for the flow nozzle of the core component hanging basket assembly of the nuclear power plant according to claim 2, characterized in that: A mounting groove (11) is provided at the top of the connecting column (2), a one-way air guide cylinder (12) is vertically arranged in the mounting groove (11), and both sides of the mounting groove (11) are connected to the top air bag (10).

4. The protective device for the flow nozzle of the core component hanging basket assembly of the Min Nuclear Power Plant according to claim 3 is characterized in that: An air inlet (14) is provided on the top of the one-way air guide cylinder (12) and is connected to the pressing airbag (5); an air outlet (13) is provided on the side of the one-way air guide cylinder (12) and is connected to the mounting groove (11); a telescopic plate (15) movable up and down is provided inside the one-way air guide cylinder (12); a compression spring (16) is connected to the telescopic plate (15) and the bottom of the mounting groove (11).

5. The protective device for the flow nozzle of the core component hanging basket assembly of the Min Nuclear Power Plant according to claim 3 is characterized in that: The pressure airbag (5) is connected to an air inlet pipe (6), and the side airbag (9) is connected to an air outlet pipe (7). The air outlet pipe (7) extends to the outside of the protective cover (1). The air inlet pipe (6) and the air outlet pipe (7) are provided with an opening and closing switch.

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