Grinding device for soft sealing valve seat of nuclear grade valve of nuclear power plant

Abstract

The utility model discloses a nuclear power plant nuclear grade valve soft seal valve seat grinding device which comprises a grinding flat plate, a first handle, a second handle, a third handle and a fourth handle are arranged on the first surface of the grinding flat plate, the first handle and the second handle are oppositely arranged, and the third handle and the fourth handle are oppositely arranged; the connecting line of the first handle and the second handle is a first connecting line, the connecting line of the third handle and the fourth handle is a second connecting line, the first connecting line is perpendicular to the second connecting line, and the intersection point of the first connecting line and the second connecting line is located on the axis of the grinding flat plate; the second surface of the grinding flat plate is used for fixing a grinding piece. By applying the grinding device for the soft sealing valve seat of the nuclear-grade valve of the nuclear power plant, the valve can be ground and maintained in the power plant without returning to a valve manufacturer for re-vulcanizing the valve seat, so that the transportation cost of the valve is saved, the transportation safety risk of the valve is reduced, the maintenance period of the valve is shortened, the overall maintenance cost of the valve is reduced, and the availability of equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power equipment grinding technology, and in particular to a grinding device for soft-seal valve seats of nuclear-grade valves in nuclear power plants. Background Technology

[0002] Nuclear power plants are equipped with numerous check valves, which prevent backflow of the medium and are commonly used in industrial systems. To achieve its check function, a check valve uses the pressure of the medium to press the valve disc against the valve seat, thus creating a seal. The sealing performance of a check valve is directly proportional to the pressure. Some swing check valves use a soft-seal material for the valve seat, employing vulcanized rubber technology, which improves the valve's sealing performance.

[0003] During routine preventative maintenance, it was found that after long-term operation, the valve seat sealing surface (such as...) of this type of valve was... Figure 1 The valve (part number 100) is deformed, causing it to fail the sealing test. Currently, it cannot be repaired on-site. It is usually returned to the factory for valve seat vulcanization treatment. Including transportation time, the repair time is usually about 3 months, which is a long repair time and a high repair cost. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a grinding device for soft-seal valve seats of nuclear-grade valves in nuclear power plants, so as to solve the problem that related technologies cannot grind soft-seal valve seats of nuclear-grade valves in nuclear power plants on site.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: A grinding device for a soft-seal valve seat of a nuclear power plant nuclear-grade valve is constructed, comprising a grinding plate, the grinding plate having a first surface and a second surface facing away from each other; the first surface of the grinding plate is provided with a first handle, a second handle, a third handle, and a fourth handle, the first handle and the second handle being opposite to each other, the third handle and the fourth handle being opposite to each other; the line connecting the first handle and the second handle is a first connecting line, the line connecting the third handle and the fourth handle is a second connecting line, the first connecting line and the second connecting line are perpendicular to each other, and the intersection of the first connecting line and the second connecting line is located on the axis of the grinding plate; the second surface of the grinding plate is used to fix the grinding workpiece.

[0006] In some embodiments, the grinding plate has a circular plate-like structure.

[0007] In some embodiments, the connection between the circumferential side surface of the grinding plate and the first surface is a rounded corner structure;

[0008] The connection between the circumferential side of the grinding plate and the second surface is a rounded corner structure.

[0009] In some embodiments, the first handle, the second handle, the third handle, and the fourth handle are integral with the grinding plate.

[0010] In some embodiments, the first handle, the second handle, the third handle, and the fourth handle are detachably connected to the grinding plate.

[0011] In some embodiments, the first handle includes a first columnar portion and a first spherical portion, a first end of the first columnar portion being connected to the grinding plate, and a second end of the first columnar portion being connected to the first spherical portion.

[0012] The second handle includes a second columnar portion and a second spherical portion, the first end of the second columnar portion is connected to the grinding plate, and the second end of the second columnar portion is connected to the second spherical portion;

[0013] The third handle includes a third columnar portion and a third spherical portion. The first end of the third columnar portion is connected to the grinding plate, and the second end of the third columnar portion is connected to the third spherical portion.

[0014] The fourth handle includes a fourth columnar portion and a fourth spherical portion. The first end of the fourth columnar portion is connected to the grinding plate, and the second end of the fourth columnar portion is connected to the fourth spherical portion.

[0015] In some embodiments, the first surface of the grinding plate is provided with a first mounting hole, a second mounting hole, a third mounting hole and a fourth mounting hole;

[0016] The first end of the first columnar portion is connected to the first mounting hole, the first end of the second columnar portion is connected to the second mounting hole, the first end of the third columnar portion is connected to the third mounting hole, and the first end of the fourth columnar portion is connected to the fourth mounting hole.

[0017] In some embodiments, the first spherical portion is provided with a first connecting hole, the second spherical portion is provided with a second connecting hole, the third spherical portion is provided with a third connecting hole, and the fourth spherical portion is provided with a fourth connecting hole;

[0018] The second end of the first columnar portion is connected to the first connecting hole, the second end of the second columnar portion is connected to the second connecting hole, the second end of the third columnar portion is connected to the third connecting hole, and the second end of the fourth columnar portion is connected to the fourth connecting hole.

[0019] In some embodiments, the grinding plate is a grinding plate made of brass.

[0020] In some embodiments, the abrasive element includes abrasive sandpaper.

[0021] The present invention offers the following advantages: By applying this nuclear power plant-grade nuclear-grade valve soft-seal seat grinding device, valves can be ground and repaired within the power plant, eliminating the need to return them to the valve manufacturer for resulfurization. This saves on valve transportation costs, reduces safety risks during valve handling, shortens valve maintenance time, and overall lowers valve maintenance costs while improving equipment availability. Furthermore, the nuclear power plant-grade nuclear-grade valve soft-seal seat grinding device has a relatively simple structure, is easy to manufacture and low in cost, is convenient to use, and can be disassembled and reused. Attached Figure Description

[0022] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of a check valve in related technologies;

[0024] Figure 2 This is a top view of a nuclear power plant nuclear-grade valve soft-seal valve seat grinding device in some embodiments of this utility model;

[0025] Figure 3 This is a side view of a nuclear power plant nuclear-grade valve soft-seal valve seat grinding device in some embodiments of this utility model;

[0026] Figure 4 This is an exploded view of a nuclear power plant nuclear-grade valve soft-seal valve seat grinding device in some embodiments of this utility model. Detailed Implementation

[0027] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0028] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0029] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art will understand that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0030] See Figures 2 to 4 This utility model discloses a grinding device for soft-seal valve seats of nuclear-grade valves in nuclear power plants. It can be used to quickly grind and repair soft-seal valve seats of nuclear-grade valves on-site at nuclear power plants. For example, it can quickly grind and repair the sealing surface of vulcanized rubber valve seats, ensuring valve sealing performance, improving valve maintenance efficiency, and reducing valve maintenance costs. The nuclear-grade valves include, but are not limited to, nuclear-grade swing check valves (such as DN500 butterfly check valves).

[0031] In some embodiments, the grinding device for soft-seal valve seats of nuclear-grade valves in nuclear power plants includes a grinding plate 10, which includes a first surface 11 and a second surface 12 facing away from each other. The first surface 11 of the grinding plate 10 is provided with a first handle 20, a second handle 30, a third handle 40, and a fourth handle 50. The first handle 20 and the second handle 30 are arranged opposite each other, and the third handle 40 and the fourth handle 50 are arranged opposite each other. The line connecting the first handle 20 and the second handle 30 is a first line, and the line connecting the third handle 40 and the fourth handle 50 is a second line. The first line and the second line are arranged perpendicularly, and the intersection of the first line and the second line is located on the axis of the grinding plate 10, so that the grinding plate 10 rotates more smoothly and more evenly when performing grinding operations. The second surface 12 of the grinding plate 10 is used to fix the grinding workpiece.

[0032] In some embodiments, the grinding plate 10 has a circular plate structure. The diameter of the grinding plate 10 is 480mm-520mm, for example, the diameter of the grinding plate 10 can be 480mm, 481mm, 482mm, 483mm, 484mm, 485mm, 486mm, 487mm, 488mm, 489mm, 490mm, 491mm, 492mm, 493mm, 494mm, 495mm, 496mm, 497mm, 498mm, 499mm, 500mm, 501mm, 502mm, 503mm, 504mm, 505mm, 506mm, 507mm, 508mm, 509mm, 510mm, 511mm, 512mm, 513mm, 514mm, 515mm, 516mm, 517mm, 518mm, 519mm, or 520mm. The thickness of the grinding plate 10 can be 18mm-25mm, for example, the thickness of the grinding plate 10 can be 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm or 25mm.

[0033] Preferably, the grinding plate 10 has a diameter of 498 mm and a thickness of 20 mm.

[0034] In some embodiments, the thickness of the grinding device for the soft-seal valve seat of the nuclear-grade valve in the entire nuclear power plant can be 150mm-165mm. For example, the thickness of the grinding device for the soft-seal valve seat of the nuclear-grade valve in the nuclear power plant can be 150mm, 151mm, 152mm, 153mm, 154mm, 155mm, 156mm, 157mm, 158mm, 159mm, 160mm, 161mm, 162mm, 163mm, 164mm, or 165mm. Preferably, the thickness of the grinding device for the soft-seal valve seat of the nuclear-grade valve in the nuclear power plant can be 160mm.

[0035] Preferably, the outer diameter (or diameter) of the grinding plate 10 is 1 mm smaller than the inner diameter of the valve body of the nuclear-grade valve in the nuclear power plant, ensuring that the grinding plate 10 matches the sealing surface and can fully grind the sealing surface of the soft-seal valve seat of the nuclear-grade valve in the nuclear power plant.

[0036] In some embodiments, the connection between the circumferential side surface 13 of the grinding plate 10 and the first surface 11 is a rounded corner structure; the connection between the circumferential side surface 13 of the grinding plate 10 and the second surface 12 is a rounded corner structure. The rounded corner structure can effectively prevent the grinding plate 10 from generating large stress when in contact with the valve body.

[0037] In some embodiments, the first handle 20, the second handle 30, the third handle 40, and the fourth handle 50 are integral with the grinding plate 10.

[0038] In some embodiments, the first handle 20, the second handle 30, the third handle 40, and the fourth handle 50 are detachably connected to the grinding plate 10.

[0039] In some embodiments, the first handle 20 includes a first columnar portion 21 and a first spherical portion 22, the first end of the first columnar portion 21 being connected to the grinding plate 10, and the second end of the first columnar portion 21 being connected to the first spherical portion 22; the second handle 30 includes a second columnar portion 31 and a second spherical portion 32, the first end of the second columnar portion 31 being connected to the grinding plate 10, and the second end of the second columnar portion 31 being connected to the second spherical portion 32; the third handle 40 includes a third columnar portion 41 and a third spherical portion 42, the first end of the third columnar portion 41 being connected to the grinding plate 10, and the second end of the third columnar portion 41 being connected to the third spherical portion 42; the fourth handle 50 includes a fourth columnar portion 51 and a fourth spherical portion 52, the first end of the fourth columnar portion 51 being connected to the grinding plate 10, and the second end of the fourth columnar portion 51 being connected to the fourth spherical portion 52.

[0040] The first columnar portion 21, the second columnar portion 31, the third columnar portion 41, and the fourth columnar portion 51 can all be cylindrical structures. The first spherical portion 22, the second spherical portion 32, the third spherical portion 42, and the fourth spherical portion 52 facilitate the lifting and transportation of the soft-seal valve seat grinding device for nuclear-grade valves in nuclear power plants.

[0041] In some embodiments, the first surface 11 of the grinding plate 10 is provided with a first mounting hole, a second mounting hole, a third mounting hole, and a fourth mounting hole. The first mounting hole, the second mounting hole, the third mounting hole, and the fourth mounting hole are all non-through holes.

[0042] The first end of the first columnar portion 21 is connected to the first mounting hole by a threaded connection, the first end of the second columnar portion 31 is connected to the second mounting hole by a threaded connection, the first end of the third columnar portion 41 is connected to the third mounting hole by a threaded connection, and the first end of the fourth columnar portion 51 is connected to the fourth mounting hole by a threaded connection.

[0043] In some embodiments, the first spherical portion 22 is provided with a first connecting hole, the second spherical portion 32 is provided with a second connecting hole, the third spherical portion 42 is provided with a third connecting hole, and the fourth spherical portion 52 is provided with a fourth connecting hole; the second end of the first columnar portion 21 is connected to the first connecting hole, the second end of the second columnar portion 31 is connected to the second connecting hole, the second end of the third columnar portion 41 is connected to the third connecting hole, and the second end of the fourth columnar portion 51 is connected to the fourth connecting hole.

[0044] Of course, in some embodiments, the first handle 20, the second handle 30, the third handle 40, and the fourth handle 50 are an integral structure. The first handle 20, the second handle 30, the third handle 40, and the fourth handle 50 may be made of brass.

[0045] In some embodiments, the first end of the axial length of the first columnar portion 21 is provided with a first threaded portion, and the second end of the axial length of the first columnar portion 21 is provided with a second threaded portion. The first threaded portion is connected to the first mounting hole, and the second threaded portion is connected to the first connecting hole of the first spherical portion 22. Both the first mounting hole and the first connecting hole can be threaded holes.

[0046] The second columnar portion 31 has a third threaded portion at its first end along its axial length and a fourth threaded portion at its second end along its axial length. The third threaded portion is connected to the second mounting hole, and the fourth threaded portion is connected to the second connecting hole of the second spherical portion 32. Both the second mounting hole and the second connecting hole can be threaded holes.

[0047] The third columnar portion 41 has a fifth threaded portion at its first end along its axial length and a sixth threaded portion at its second end along its axial length. The fifth threaded portion is connected to the third mounting hole, and the sixth threaded portion is connected to the third connecting hole of the third spherical portion 42. Both the third mounting hole and the third connecting hole can be threaded holes.

[0048] The fourth columnar portion 51 has a seventh threaded portion at its first end along its axial length and an eighth threaded portion at its second end along its axial length. The seventh threaded portion is connected to the fourth mounting hole, and the eighth threaded portion is connected to the fourth connecting hole of the fourth spherical portion 52. Both the fourth mounting hole and the fourth connecting hole can be threaded holes.

[0049] In some embodiments, the grinding plate 10 is made of brass. Made of brass, it has a certain weight, and the grinding of the soft-seal valve seat of nuclear-grade valves in nuclear power plants can be achieved by the weight of the grinding plate 10 itself plus manual rotation, without the need for personnel to apply pressure. Furthermore, brass is relatively lightweight and will not damage other metal structures of the valve.

[0050] In some embodiments, the abrasive component includes abrasive paper. The abrasive paper can be adhered to the second surface 12. During abrasion, the abrasive paper is cut into several fan-shaped (or other shapes) pieces and evenly adhered to the second surface 12 of the abrasive plate 10. For coarse abrasion, abrasive paper with a larger grit is used. After coarse abrasion, depending on the condition of the sealing surface, abrasive paper with a smaller grit is used for fine abrasion. Normally, 60µm abrasive paper is selected for coarse abrasion. The abrasive paper does not need to be adhered in whole sheets; several pieces are evenly distributed on the abrasive plate 10. A larger number of abrasive papers results in a greater abrasion load on the sealing surface. The number of abrasive papers adhered can be determined based on the size and depth of the defect, and is not specifically limited here.

[0051] In some embodiments, the grinding plate 10 is machined as a single piece, facilitating the attachment and replacement of sandpaper and improving grinding efficiency. Furthermore, the sandpaper can be of a uniform size for easy prefabrication, preventing it from being attached to and removed from the grinding plate 10, thus improving work efficiency.

[0052] The application of the grinding device for soft-seal valve seats of nuclear power plant nuclear-grade valves is as follows: Abrasive materials such as abrasive paper are attached to the grinding plate 10 and gently placed on the valve seat. The grinding plate 10 is operated by four handles, and the grinding plate 10 rotates in a circular motion to grind the soft-seal valve seat of nuclear power plant nuclear-grade valves (such as vulcanized rubber valve seats), thereby achieving the grinding of the sealing surface and eliminating defects in the sealing surface.

[0053] Inspection method after grinding:

[0054] 1. Check the flatness of vulcanized rubber using a knife-edge ruler (light transmission method). Press the knife-edge ruler against the sealing surface along its diameter and observe the light transmission from one side of the ruler. If light passes through from the outside of the sealing surface, the sealing surface is convex; if light passes through from the inside, the sealing surface is concave; if no light passes through, the sealing surface is flat.

[0055] 2. Blue oil test: Apply blue oil evenly to the sealing surface of the vulcanized rubber valve seat. Place the valve discs individually and parallel on the valve seat. Apply appropriate pressure to the center of the valve discs. Lift the valve discs and check the contact of the blue oil on the sealing surface. If the blue oil is evenly in contact with the sealing surface, it indicates that the flatness of the sealing surface is very good.

[0056] 3. Assemble the valve and perform a reverse water pressure test to verify its sealing performance.

[0057] The nuclear power plant's nuclear-grade valve soft-seal seat grinding device enables internal maintenance of vulcanized rubber valve seats within the power plant, improving valve maintenance efficiency.

[0058] The original nuclear power plant did not have a grinding device for the soft-seal valve seat of the nuclear-grade valve. It would take 3 months to return the valve to the factory to replace the vulcanized rubber valve seat, and the repair cost for one valve would be at least 10,000 yuan.

[0059] By applying this nuclear power plant-grade valve soft-seal seat grinding device, valves can be ground and repaired on-site within the power plant, eliminating the need to return them to the valve manufacturer for resulfurization. This saves on valve transportation costs, reduces safety risks during valve handling, shortens valve repair time, and overall lowers valve maintenance costs while improving equipment availability. Furthermore, this nuclear power plant-grade valve soft-seal seat grinding device has a relatively simple structure, is easy to manufacture and low in cost, is convenient to use, and can be disassembled and reused.

[0060] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A nuclear grade valve soft seat grinding device for a nuclear power plant, characterized by, The grinding plate (10) includes a first surface (11) and a second surface (12) facing away from each other. The first surface (11) of the grinding plate (10) is provided with a first handle (20), a second handle (30), a third handle (40) and a fourth handle (50). The first handle (20) and the second handle (30) are arranged opposite to each other, and the third handle (40) and the fourth handle (50) are arranged opposite to each other. The line connecting the first handle (20) and the second handle (30) is a first line, and the line connecting the third handle (40) and the fourth handle (50) is a second line. The first line and the second line are arranged perpendicularly, and the intersection of the first line and the second line is located on the axis of the grinding plate (10). The second surface (12) of the grinding plate (10) is used to fix the grinding workpiece.

2. The nuclear class valve soft seal valve seat grinding apparatus of claim 1, wherein, The grinding plate (10) has a circular plate structure.

3. The nuclear grade valve soft seal seat grinding apparatus for nuclear power plants according to claim 1, characterized by, The connection between the circumferential side surface (13) of the grinding plate (10) and the first surface (11) is a rounded corner structure; The connection between the circumferential side surface (13) of the grinding plate (10) and the second surface (12) is a rounded corner structure.

4. The nuclear grade valve soft seal seat grinding apparatus for nuclear power plants according to claim 1, characterized by, The first handle (20), the second handle (30), the third handle (40) and the fourth handle (50) are integrated with the grinding plate (10).

5. The nuclear grade valve soft seal seat grinding apparatus of claim 1, wherein, The first handle (20), the second handle (30), the third handle (40) and the fourth handle (50) are detachably connected to the grinding plate (10).

6. The nuclear grade valve soft seal valve seat grinding apparatus of claim 5, wherein, The first handle (20) includes a first columnar part (21) and a first spherical part (22). The first end of the first columnar part (21) is connected to the grinding plate (10), and the second end of the first columnar part (21) is connected to the first spherical part (22). The second handle (30) includes a second columnar portion (31) and a second spherical portion (32). The first end of the second columnar portion (31) is connected to the grinding plate (10), and the second end of the second columnar portion (31) is connected to the second spherical portion (32). The third handle (40) includes a third columnar part (41) and a third spherical part (42). The first end of the third columnar part (41) is connected to the grinding plate (10), and the second end of the third columnar part (41) is connected to the third spherical part (42). The fourth handle (50) includes a fourth columnar part (51) and a fourth spherical part (52). The first end of the fourth columnar part (51) is connected to the grinding plate (10), and the second end of the fourth columnar part (51) is connected to the fourth spherical part (52).

7. The nuclear grade valve soft seal valve seat grinding apparatus of claim 6, wherein, The first surface (11) of the grinding plate (10) is provided with a first mounting hole, a second mounting hole, a third mounting hole and a fourth mounting hole; The first end of the first columnar part (21) is connected to the first mounting hole, the first end of the second columnar part (31) is connected to the second mounting hole, the first end of the third columnar part (41) is connected to the third mounting hole, and the first end of the fourth columnar part (51) is connected to the fourth mounting hole.

8. The nuclear grade valve soft seal valve seat grinding apparatus of claim 6, wherein, The first spherical part (22) is provided with a first connecting hole, the second spherical part (32) is provided with a second connecting hole, the third spherical part (42) is provided with a third connecting hole, and the fourth spherical part (52) is provided with a fourth connecting hole; The second end of the first columnar part (21) is connected to the first connecting hole, the second end of the second columnar part (31) is connected to the second connecting hole, the second end of the third columnar part (41) is connected to the third connecting hole, and the second end of the fourth columnar part (51) is connected to the fourth connecting hole.

9. The nuclear grade valve soft seal seat grinding apparatus for nuclear power plants according to any one of claims 1 to 8, characterized by, The grinding plate (10) is a grinding plate (10) made of brass.

10. The nuclear class valve soft seal valve seat grinding apparatus of any one of claims 1 to 8, wherein, The grinding element includes abrasive paper.

Images