Nuclear power plant generator stator end part maintenance protection device

Abstract

The utility model discloses a nuclear power plant generator stator end part maintenance protection device which comprises an inflation support frame and a protective cover covering the inflation support frame, one end of the protective cover is of an open structure, the other end of the protective cover is provided with an inlet and outlet, and the inlet and outlet is provided with door cloth; the inflation supporting frame comprises a first supporting assembly, a second supporting assembly and a third supporting assembly. The first supporting assembly comprises a plurality of first inflation supporting columns, the second supporting assembly comprises a plurality of second inflation supporting columns, the second inflation supporting columns are arranged in parallel at intervals in the first direction, the third supporting assembly comprises a plurality of third inflation supporting columns, and the third inflation supporting columns are in an arch shape. During nuclear power plant maintenance, protection and maintenance facilities can be quickly established after the generator stator end cover is detached and lifted away, a maintenance foreign matter prevention isolation area can be taken into consideration, the structure strength is high, the whole body is light and convenient, the installation is simple, the device can be quickly built and detached during generator maintenance, and the maintenance site workload and human input are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power, in particular to a maintenance and protection device for the end part of a generator stator in a nuclear power plant. Background Art

[0002] The nuclear power generator of a certain nuclear power plant is a Siemens model QFSN-1100-4 water-hydrogen-hydrogen nuclear power steam turbine generator produced by Shanghai Electric Generator Works. During the operation of the unit, the entire generator stator winding is completely enclosed in a casing that forms a hydrogen circulation system and a cooling system. Large end covers are installed at both ends and sealed with sealant to ensure the safe and stable operation of the generator within the rated temperature range, prevent foreign objects from entering and causing equipment damage, and also prevent internal hydrogen leakage and industrial safety risks. When the unit is shut down and switched to the maintenance state, the generator end covers need to be removed and lifted off.

[0003] Since the nuclear power plant is located along the coast, the environmental humidity is always at a relatively high level throughout the year, and the environmental air is affected by seawater and has high corrosiveness. When the generator end covers are removed and lifted off, the entire generator stator winding will be exposed to the environmental air. Affected by the environmental humidity and air, its insulation performance will rapidly decline, and rust is likely to occur on the surface. In addition, to ensure that risks such as equipment damage caused by introducing foreign objects during the maintenance process are avoided, it is necessary to promptly set up maintenance and protection facilities after the generator end covers are removed and lifted off to physically protect the end part of the generator stator, keep the entire generator stator in a sealed state, and perform insulation maintenance on its internal windings.

[0004] Since the overall dimensions of the end part of the nuclear power generator stator are approximately: length 4200 mm × width 2500 mm × height 3200 mm, to meet the overall protection of the generator stator and the insulation maintenance of the windings, and at the same time taking into account the needs of maintenance work, the size of the maintenance and protection facilities to be set up should not be less than length 5000 mm × width 3000 mm × height 3600 mm. To set up such a maintenance and protection facility for the generator stator, 4 - 6 people are required to first use metal scaffolding to support the main structure, and then 6 - 8 people are required to lay and bond canvas on the metal frame. The overall setup and disassembly work requires a large amount of manpower, with a large workload, and it takes up about 18 hours of the critical path of the conventional island during the major overhaul. There are also relatively high industrial safety risks and risks of metal steel pipes bumping into important equipment during the setup process. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a maintenance and protection device for the end part of a generator stator in a nuclear power plant.

[0006] The technical solution adopted by the present utility model to solve its technical problems is: to construct a maintenance and protection device for the end part of a generator stator in a nuclear power plant, including an inflatable support frame and a protective cover covering the inflatable support frame. One end of the protective cover along the first direction of the inflatable support frame is an open structure, and the other end of the protective cover along the first direction of the inflatable support frame is provided with an inlet and outlet, and a door cloth is provided at the inlet and outlet.

[0007] The inflatable support frame includes a first support component, a second support component, and a third support component. The first support component and the second support component are arranged relatively at intervals, and the third support component connects the upper parts of the first support component and the second support component.

[0008] The first support component includes a plurality of first inflatable support columns, and the plurality of first inflatable support columns are arranged at intervals and in parallel along the first direction. The second support component includes a plurality of second inflatable support columns, and the plurality of second inflatable support columns are arranged at intervals and in parallel along the first direction. The third support component includes a plurality of third inflatable support columns, and the plurality of third inflatable support columns are arranged at intervals and in parallel along the first direction, and the third inflatable support columns are in an arch shape.

[0009] In some embodiments, the first support component further includes a plurality of first inflatable connection columns, and the plurality of first inflatable connection columns connect the plurality of first inflatable support columns.

[0010] In some embodiments, the second support component further includes a plurality of second inflatable connection columns, and the plurality of second inflatable connection columns connect the plurality of second inflatable support columns.

[0011] In some embodiments, the third support component further includes a plurality of third inflatable connection columns, and the plurality of third inflatable connection columns connect the plurality of third inflatable support columns.

[0012] In some embodiments, a plurality of viewing windows are further provided on the protective cover.

[0013] In some embodiments, a storage bag or a storage box is provided on the inner side of the protective cover.

[0014] In some embodiments, an inflation and deflation interface is provided on the inflatable support frame.

[0015] In some embodiments, the number of the first inflatable support columns, the second inflatable support columns, and the third inflatable support columns is the same.

[0016] In some embodiments, the number of the first inflatable support columns, the second inflatable support columns, and the third inflatable support columns is three each.

[0017] In some embodiments, the material of the inflatable support frame is PVC double-sided knife scraping cloth.

[0018] Implementing the present utility model has the following beneficial effects: The maintenance and protection device for the end part of the generator stator in a nuclear power plant can quickly establish protection and maintenance facilities after the generator stator end cover is disassembled and lifted during the maintenance of the nuclear power plant, and can timely protect and maintain major electrical equipment, which can avoid introducing foreign objects to cause equipment damage. At the same time, it can also take into account the needs of maintenance work. The maintenance and protection device for the end part of the generator stator in a nuclear power plant can take into account the maintenance anti-foreign object isolation area, with high structural strength, light overall weight, and simple installation. It can be quickly built and disassembled during generator maintenance, reducing the workload and manpower input at the maintenance site, avoiding the occurrence of industrial safety incidents and major equipment damage incidents, and optimizing the critical path duration of the conventional island during the major overhaul. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the present utility model, the present utility model will be further described below in conjunction with the drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings. In the drawings:

[0020] Figure 1 is a schematic structural diagram of the maintenance and protection device for the end part of the generator stator in a nuclear power plant in some embodiments of the present utility model;

[0021] Figure 2 is a schematic structural diagram of the inflatable support frame in some embodiments of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to have a clearer understanding of the technical features, objectives, and effects of the present utility model, the specific embodiments of the present utility model will now be described in detail with reference to the drawings. In the following description, it should be understood that the orientation or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are based on the orientation or positional relationships shown in the drawings, and are constructed and operated in a specific orientation, only for the convenience of describing the technical solution, rather than indicating that the device or element referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0023] It should also be noted that, unless otherwise clearly specified and limited, terms such as "installation", "connection", "linkage", "fixation", "setting" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. When a component is referred to as "on" or "under" another component, the component can be "directly" or "indirectly" located above the other component, or there may also be one or more intermediate components. Terms such as "first", "second", "third", etc. are only for the convenience of describing the technical solution of the present invention, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", etc. can explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present utility model. However, those skilled in the art should clearly understand that the present utility model can also be implemented in other embodiments without these specific details. In other cases, the detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present utility model.

[0025] Please refer to Figures 1 to 2 , the present utility model shows a maintenance and protection device for the end part of a generator stator in a nuclear power plant, which can be applied during the maintenance of the nuclear power plant. After the generator end cover is disassembled and lifted off, it can quickly establish protection and maintenance facilities, timely protect and maintain major electrical equipment, avoid introducing foreign objects to cause equipment damage, and at the same time can also take into account the needs of maintenance work. Further, the overall size of the maintenance and protection device for the end part of the generator stator in the nuclear power plant is not less than 5000 mm in length × 3000 mm in width × 3600 mm in height.

[0026] The maintenance and protection device for the end part of the generator stator in the nuclear power plant may include an inflatable support frame 10 and a protective cover 20 covering the inflatable support frame 10. One end of the protective cover 20 along the first direction of the inflatable support frame 10 is an open structure, and the other end of the protective cover 20 along the first direction of the inflatable support frame 10 is provided with an inlet and outlet, and a door cloth 21 is provided at the inlet and outlet. The open structure of the protective cover 20 is convenient for the end part of the generator stator in the nuclear power plant to enter and exit, and the inlet and outlet are for personnel and items to enter and exit. The size of the door cloth 21 is similar to the size of the inlet and outlet. For example, both can be 2000 mm in length and 2000 mm in width.

[0027] The inflatable support frame 10 includes a first support assembly 11, a second support assembly 12, and a third support assembly 13. The first support assembly 11 and the second support assembly 12 are arranged at a relative interval, and the third support assembly 13 is connected to the upper parts of the first support assembly 11 and the second support assembly 12.

[0028] The first support assembly 11 includes a plurality of first inflatable support columns 111, and the plurality of first inflatable support columns 111 are arranged at intervals and in parallel along a first direction. The second support assembly 12 includes a plurality of second inflatable support columns 121, and the plurality of second inflatable support columns 121 are arranged at intervals and in parallel along the first direction. The third support assembly 13 includes a plurality of third inflatable support columns 131, and the plurality of third inflatable support columns 131 are arranged at intervals and in parallel along the first direction, and the third inflatable support columns 131 are in an arch shape or an arc shape. Here, the "first direction" may be the length direction of the inflatable support frame 10.

[0029] The maintenance and protection device for the end part of the generator stator in a nuclear power plant adopts the inflatable support frame 10. When in use, it can be inflated for convenient erection. When not in use, it can be deflated for convenient storage, reducing the workload and manpower input at the maintenance site, avoiding industrial safety incidents and major equipment damage incidents, and optimizing the critical path duration of the conventional island during the major overhaul.

[0030] In some embodiments, the first inflatable support columns 111, the third inflatable support columns 131, and the second inflatable support columns 121 may be connected to each other.

[0031] In some embodiments, the number of the first inflatable support columns 111, the second inflatable support columns 121, and the third inflatable support columns 131 is the same. Preferably, the number of the first inflatable support columns 111, the second inflatable support columns 121, and the third inflatable support columns 131 may be at least two.

[0032] In some embodiments, the number of the first inflatable support columns 111, the second inflatable support columns 121, and the third inflatable support columns 131 is three.

[0033] In some embodiments, the first support assembly 11 further includes a plurality of first inflatable connection columns 112, and the plurality of first inflatable connection columns 112 connect the plurality of first inflatable support columns 111. The first inflatable support columns 111 and the first inflatable connection columns 112 may be connected. When in the inflated state, the first inflatable support columns 111 and the first inflatable connection columns 112 are generally in a cylindrical shape. Preferably, at least one first inflatable support column 111 connects the lower parts of all the first inflatable support columns 111.

[0034] In some embodiments, the second support assembly 12 further includes a plurality of second inflatable connecting columns 122, and the plurality of second inflatable connecting columns 122 are connected to a plurality of second inflatable support columns 121. The second inflatable support columns 121 and the second inflatable connecting columns 122 may be communicatively arranged. When the second inflatable support columns 121 and the second inflatable connecting columns 122 are in an inflated state, they are generally cylindrical. Preferably, at least one second inflatable connecting column 122 is connected to the lower portions of all the second inflatable support columns 121.

[0035] In some embodiments, the third support assembly 13 further includes a plurality of third inflatable connecting columns 132, and the plurality of third inflatable connecting columns 132 are connected to a plurality of third inflatable support columns 131. The third inflatable connecting columns 132 and the third inflatable support columns 131 may be communicatively arranged to avoid the phenomenon of roof collapse. When the third inflatable support columns 131 and the third inflatable connecting columns 132 are in an inflated state, the cross-sections thereof may both be circular. Preferably, at least one third inflatable connecting column 132 is connected to the upper portions of all the third inflatable support columns 131 (as Figure 2 shown).

[0036] Understandably, the provision of the first inflatable connecting column 112, the second inflatable connecting column 122, and the third inflatable connecting column 132 can improve the overall structural strength of the inflatable support frame 10.

[0037] In some embodiments, the inflatable support frame 10 is provided with an inflation and deflation interface. For example, the first inflatable support column 111, the third inflatable support column 131, and / or the second inflatable support column 121 are provided with inflation and deflation interfaces, and the following situations may occur: (1) The first inflatable support column 111, the third inflatable support column 131, and the second inflatable support column 121 are connected in communication. The first inflatable support column 111 is provided with an inflation and deflation interface, while the second inflatable support column 121 and the third inflatable support column 131 are not provided with inflation and deflation interfaces. (2) The first inflatable support column 111, the third inflatable support column 131, and the second inflatable support column 121 are connected in communication. The first inflatable support column 111 and the third inflatable support column 131 are not provided with inflation and deflation interfaces, while the second inflatable support column 121 is provided with an inflation and deflation interface. (3) The first inflatable support column 111, the third inflatable support column 131, and the second inflatable support column 121 are connected in communication. The first inflatable support column 111 and the second inflatable support column 121 are not provided with inflation and deflation interfaces, while the third inflatable support column 131 is provided with an inflation and deflation interface. (4) The first inflatable support column 111, the third inflatable support column 131, and the second inflatable support column 121 are connected in communication. The first inflatable support column 111, the first inflatable support column 111, and the third inflatable support column 131 are all provided with inflation and deflation interfaces. When the first inflatable support column 111, the first inflatable support column 111, and the third inflatable support column 131 are all provided with inflation and deflation interfaces, a gas supply device (such as an air compressor) can be connected, and inflation can be carried out through the gas supply device (such as an air compressor), so that the inflatable support frame 10 can be quickly inflated, and rapid erection can be achieved. The inflation and deflation interface can be connected to an air extraction device (such as an air extractor), and air extraction operation can be carried out through the air extraction device, so that the inflatable support frame 10 can be quickly deflated. The rated voltages of the gas supply device (such as an air compressor) and the air extraction device (such as an air extractor) are 220VAC.

[0038] In some embodiments, the first inflatable connection column 112, the second inflatable connection column 122, and / or the third inflatable connection column 132 may also be provided with inflation and deflation interfaces.

[0039] In some embodiments, a control valve may also be provided on the inflation and deflation interface to facilitate controlling the flow rate and velocity of the gas during inflation and deflation. Of course, in some embodiments, an inflation interface and a deflation interface may also be provided separately, and specific limitations are not made here.

[0040] In some embodiments, the material of the inflatable support frame 10 is PVC double-sided knife-coated fabric. The PVC double-sided knife-coated fabric has good stability and excellent properties such as waterproof, ultraviolet-resistant, aging-resistant, corrosion-resistant, temperature-resistant, film-resistant, fold-resistant, soft, and good elasticity. The protective cover 20 may be PVC double-sided knife-coated fabric or made of other canvas.

[0041] In some embodiments, a number of viewing windows 22 are further provided on the protective cover 20. For example, Figure 1 As shown, the number of the viewing windows 22 can be four, with two viewing windows 22 provided on each side. The viewing windows 22 are transparent windows for daylighting and cannot be opened. Preferably, the viewing windows 22 are made of a light-transmitting material, which can not only achieve daylighting but also prevent foreign objects from entering the maintenance protection device for the end part of the generator stator of the nuclear power plant. The light-transmitting material can be a polyvinyl alcohol (PVA) resin film or a PET film. The PET film is made from polyethylene terephthalate glycol ester as the raw material, extruded into a thick sheet, and then biaxially stretched into a film material. Of course, the light-transmitting material can also be other polymer films, which are not specifically limited here.

[0042] Preferably, the viewing windows 22 can be rectangular.

[0043] In some embodiments, a storage bag or a storage box is provided inside the protective cover 20 to facilitate the storage of related operating parts such as wrenches, or related components such as screws at the end part of the generator stator of the nuclear power plant.

[0044] In some embodiments, the protective cover 20 can be connected to the inflatable support frame 10 by means of hanging ropes, Velcro (hook-and-loop fasteners) and / or magnetic strips to ensure quick and reliable connection.

[0045] In some embodiments, the inflatable support frame 10 and / or the protective cover 20 are further provided with lifting rings or lifting ropes to facilitate lifting. Preferably, the protective cover 20 is provided with lifting rings or lifting ropes to facilitate lifting.

[0046] In some embodiments, the maintenance protection device for the end part of the generator stator of the nuclear power plant can be configured with a storage box to store the inflatable support frame 10 and / or the protective cover 20. The storage box can be designed with functions such as lifting, fixing, and transporting, which are not specifically limited here.

[0047] The maintenance protection device for the end part of the generator stator of the nuclear power plant can quickly establish protection and maintenance facilities after the generator stator end cover is removed and lifted during the nuclear power plant maintenance period, timely protect and maintain major electrical equipment, avoid damage to the equipment caused by foreign objects being introduced, and at the same time take into account the needs of the maintenance work. The maintenance protection device for the end part of the generator stator of the nuclear power plant can take into account the maintenance foreign object isolation area. It has high structural strength, is overall lightweight, simple to install, can be quickly built and demolished during generator maintenance, reduces the workload and manpower input at the maintenance site (the inflation and deflation time does not exceed 0.5 hours), avoids the occurrence of industrial safety incidents and major equipment damage incidents, and optimizes the critical path construction period of the conventional island during the major overhaul.

[0048] Understandably, the above embodiments only represent the preferred embodiments of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present utility model; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present utility model; therefore, all equivalent transformations and modifications made to the scope of the claims of the present utility model shall fall within the scope covered by the claims of the present utility model.

Claims

1. A maintenance and protection device for the end part of a generator stator in a nuclear power plant, characterized in that It includes an inflatable support frame (10) and a protective cover (20) covering the inflatable support frame (10). One end of the protective cover (20) along the first direction of the inflatable support frame (10) is an open structure, and the other end of the protective cover (20) along the first direction of the inflatable support frame (10) is provided with an inlet and outlet, and a door cloth (21) is provided at the inlet and outlet. The inflatable support frame (10) includes a first support component (11), a second support component (12) and a third support component (13). The first support component (11) and the second support component (12) are arranged at intervals relatively, and the third support component (13) connects the upper parts of the first support component (11) and the second support component (12). The first support component (11) includes a plurality of first inflatable support columns (111). The plurality of first inflatable support columns (111) are arranged at intervals and in parallel along the first direction. The second support component (12) includes a plurality of second inflatable support columns (121). The plurality of second inflatable support columns (121) are arranged at intervals and in parallel along the first direction. The third support component (13) includes a plurality of third inflatable support columns (131). The plurality of third inflatable support columns (131) are arranged at intervals and in parallel along the first direction, and the third inflatable support columns (131) are in an arched shape.

2. The overhaul protection and maintenance device for the stator end of a nuclear power plant generator according to claim 1, characterized in that, The first support component (11) further includes a plurality of first inflatable connection columns (112). The plurality of first inflatable connection columns (112) connect the plurality of first inflatable support columns (111).

3. The overhaul protection and maintenance device for the end part of the generator stator of a nuclear power plant according to claim 1, characterized in that, The second support component (12) further includes a plurality of second inflatable connection columns (122). The plurality of second inflatable connection columns (122) connect the plurality of second inflatable support columns (121).

4. The maintenance and protection device for the end part of the generator stator of a nuclear power plant according to claim 1, characterized in that The third support component (13) further includes a plurality of third inflatable connection columns (132). The plurality of third inflatable connection columns (132) connect the plurality of third inflatable support columns (131).

5. The overhaul protection and maintenance device for the end part of the generator stator of a nuclear power plant according to claim 1, wherein A plurality of viewing windows (22) are further provided on the protective cover (20).

6. The overhaul protection and maintenance device for the end part of the generator stator of a nuclear power plant according to claim 1, characterized in that, A storage bag or a storage box is provided inside the protective cover (20).

7. The overhaul protection and maintenance device for the stator end of a nuclear power plant generator according to claim 1, characterized in that, An inflation and deflation interface is provided on the inflatable support frame (10).

8. The overhaul protection and maintenance device for the end part of the generator stator of a nuclear power plant according to claim 1, characterized in that, The number of the first inflatable support columns (111), the second inflatable support columns (121) and the third inflatable support columns (131) is the same.

9. The overhaul protection and maintenance device for the stator end of a nuclear power plant generator according to claim 8, wherein The number of the first inflatable support columns (111), the second inflatable support columns (121) and the third inflatable support columns (131) is three each.

10. The overhaul protection and maintenance device for the end part of the generator stator of a nuclear power plant according to any one of claims 1 to 9, characterized in that, The material of the inflatable support frame (10) is PVC double-sided knife-coated fabric.

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