Grinding device for spherical sealing surface of valve in nuclear power plant

Abstract

The utility model discloses a nuclear power plant valve spherical sealing surface grinding device which comprises a first grinding piece used for grinding a nuclear power plant valve spherical sealing convex surface and a second grinding piece used for grinding a nuclear power plant valve spherical sealing concave surface. The first grinding piece comprises a columnar body, and the first end of the columnar body is concaved inwards to form a spherical grinding groove used for being matched with the spherical sealing convex face of the nuclear power plant valve. The second grinding piece comprises a columnar operation part, and one end of the columnar operation part is provided with a spherical grinding part matched with the spherical sealing concave face of the nuclear power plant valve. The grinding device for the spherical sealing surface of the nuclear power plant valve can remarkably improve the grinding effect of the spherical sealing surface, is higher in grinding speed, low in repeated grinding probability and shorter in maintenance time, and effectively improves the equipment maintenance efficiency.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power technology, and in particular to a grinding device for the spherical sealing surface of a nuclear power plant valve. Background Technology

[0002] The valve disc and seat sealing surfaces of the SEMPELL pressure regulator safety valve's mechanical pilot valve have a spherical structure. Currently, manual grinding with abrasive paper is used for repair on-site, but the grinding effect is poor and the success rate of sealing surface repair is low. This often leads to the original parts failing to meet the sealing test standards, requiring replacement with new spare parts, resulting in high operating costs. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a grinding device for the spherical sealing surface of a nuclear power plant valve.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct a grinding device for the spherical sealing surface of a nuclear power plant valve, including a first grinding component for grinding the convex surface of the spherical sealing surface of a nuclear power plant valve, and a second grinding component for grinding the concave surface of the spherical sealing surface of a nuclear power plant valve.

[0005] The first grinding element includes a columnar body, and a first end of the columnar body is recessed to form a spherical grinding groove for cooperating with the spherical sealing convex surface of the nuclear power plant valve; the second grinding element includes a columnar operating part, and one end of the columnar operating part is provided with a spherical grinding part that cooperates with the spherical sealing concave surface of the nuclear power plant valve.

[0006] In some embodiments, at least a portion of the outer surface of the columnar body is provided with a first anti-slip structure.

[0007] In some embodiments, the columnar body is provided with a through hole, which penetrates the end face of the second end of the columnar body and is axially connected to the spherical grinding groove.

[0008] In some embodiments, the diameter of the spherical grinding groove is 33.82 mm, 33.85 mm, 33.86 mm, or 33.88 mm.

[0009] In some embodiments, the first grinding element is a single-piece structure.

[0010] In some embodiments, at least a portion of the outer surface of the columnar operating part is provided with a second anti-slip structure.

[0011] In some embodiments, the second grinding member includes a connecting portion that connects the columnar operating portion and the spherical grinding portion; the diameter of the connecting portion is smaller than the diameter of the spherical grinding portion.

[0012] In some embodiments, the diameter of the spherical grinding part is 33.72 mm, 33.74 mm, 33.75 mm, or 33.78 mm.

[0013] In some embodiments, the second grinding element is an integral structure.

[0014] In some embodiments, both the first grinding element and the second grinding element are made of brass.

[0015] The present invention offers the following advantages: The nuclear power plant valve spherical sealing surface grinding device includes a first grinding component for grinding the convex surface of the spherical seal of a nuclear power plant valve, and a second grinding component for grinding the concave surface of the spherical seal of a nuclear power plant valve. The first grinding component includes a columnar body, with a spherical grinding groove formed at the first end of the columnar body to mate with the convex surface of the spherical seal of the nuclear power plant valve. The second grinding component includes a columnar operating part, with a spherical grinding part at one end of the columnar operating part to mate with the concave surface of the spherical seal of the nuclear power plant valve. The nuclear power plant valve spherical sealing surface grinding device can significantly improve the grinding effect of the spherical sealing surface, and also offers faster grinding speed, lower probability of repeated grinding, and shorter maintenance time, effectively improving equipment maintenance efficiency. Attached Figure Description

[0016] 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:

[0017] Figure 1 This is a schematic diagram of the structure of the first grinding element in some embodiments of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the second grinding element in some embodiments of this utility model. Detailed Implementation

[0019] 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.

[0020] 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.

[0021] 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.

[0022] See Figure 1 and Figure 2 This utility model discloses a grinding device for the spherical sealing surface of a nuclear power plant valve, including a first grinding element 10 for grinding the convex spherical sealing surface of the nuclear power plant valve, and a second grinding element 20 for grinding the concave spherical sealing surface of the nuclear power plant valve. The convex spherical sealing surface of the nuclear power plant valve can be the convex spherical sealing surface of the valve disc, or it can be the convex spherical sealing surface of the valve seat. The concave spherical sealing surface of the nuclear power plant valve can be the concave spherical sealing surface of the valve disc, or it can be the concave spherical sealing surface of the valve seat. The nuclear power plant valve can be, but is not limited to, a SEMPELL pressurizer safety valve or a mechanical pilot valve.

[0023] The first grinding element 10 includes a columnar body 11, with a spherical grinding groove 12 formed concave at the first end of the columnar body 11 for engaging with the spherical sealing convex surface of the nuclear power plant valve. The columnar body 11 is generally cylindrical, and both the end face of the first axial end and the axial direction of the columnar body 11 can be planar. At least a portion of the outer surface of the columnar body 11 is provided with a first anti-slip structure 111, which includes, but is not limited to, textures, concave-convex structures, or other structures that increase friction.

[0024] The columnar body 11 is provided with a through hole 112, which penetrates the end face of the second end of the columnar body 11 and is axially connected to the spherical grinding groove 12. The through hole 112 prevents pressure buildup, ensuring the grinding area is the same as the external environment, thus preventing the spherical sealing convex surface of the nuclear power plant valve from sticking and seizing up with the spherical grinding groove 12 during grinding, which would affect the grinding effect. The inner diameter of the through hole 112 can be selected and set according to actual needs; no specific limitation is made here.

[0025] In some embodiments, the diameter of the spherical grinding groove 12 is 33.82 mm, 33.85 mm, 33.86 mm, or 33.88 mm.

[0026] Specifically, to ensure the sealing effect of the spherical sealing convex surface of nuclear power plant valves, it is essential to ensure the uniformity of the spherical sealing convex surface dimensions after grinding and repair. Therefore, the dimensions of the spherical grinding groove 12 of the first grinding part 10 used in the grinding process must be completely consistent with the original design dimensions of the spherical sealing convex surface of the nuclear power plant valves to prevent changes in the spherical surface dimensions due to unreasonable grinding tool dimensions. The influence of the grinding paste size on the dimensions of the spherical sealing convex surface of the nuclear power plant valves needs to be considered during the grinding process.

[0027] The spherical seal convex surface of nuclear power plant valves has high dimensional requirements and high requirements for the fit of the sealing surface after grinding. Furthermore, the grinding of the spherical seal convex surface of nuclear power plant valves must be carried out using grinding paste. Therefore, the influence of the size of the grinding paste particles on the spherical surface size after grinding must also be considered during the grinding process.

[0028] For example, taking F600 polishing paste as an example, its particle diameter is: 25.4 ÷ 600 = 0.04 mm. The mesh number of polishing paste refers to how many particles are in one inch. Therefore, the size of one particle is one inch divided by the corresponding mesh number. One inch is 25.4 mm. Furthermore, when using polishing paste of this mesh number to polish the convex surface of the spherical seal of a nuclear power plant valve, the size of the spherical surface after polishing (assuming its diameter is d1) is no longer the size of the spherical surface of the polishing tool (assuming the diameter of the spherical polishing groove 12 of the first polishing part 10 is d2). Instead, it is the size of the spherical polishing groove 12 of the first polishing part 10 plus the size of the polishing paste. That is to say: d1 = d2 - (0.04 x 2) mm.

[0029] Furthermore, considering the characteristics of the spherical sealing convex surface of nuclear power plant valves, when using the first grinding part 10 to grind the spherical sealing convex surface of the nuclear power plant valve, it is necessary to ensure that the spherical grinding groove 12 of the first grinding part 10 is smooth and clean. If the surface of the spherical grinding groove 12 is rough, it is very easy to cause scratches on the spherical sealing convex surface of the nuclear power plant valve during the grinding process, affecting the grinding and repair effect. Currently, the minimum precision of commonly used grinding paste is 0.01mm. To ensure the accuracy of the actual dimensions of the first grinding part 10, the machining precision of the first grinding part 10 should be at least one grade higher than the minimum precision of the first grinding part 10. That is to say, theoretically, the machining precision of the first grinding part 10 should not be less than 0.001mm. However, considering the actual situation, after surveying the processing capabilities of existing machine tools on the market, to ensure the feasibility of the processing plan, the machining precision of the first grinding part 10 can be set at 0.002~0.005mm.

[0030] In summary, the dimensions of the spherical grinding groove 12 of the first grinding element 10 can be as follows:

[0031] Table 1

[0032]

[0033] Of course, the size of the spherical grinding groove 12 can be adjusted appropriately according to the actual size of the spherical sealing convex surface of the nuclear power plant valve, and no specific limitation is made here.

[0034] The second grinding part 20 is described below, such as Figure 2 As shown, in some embodiments, the second grinding element 20 includes a columnar operating portion 21, one end of which is provided with a spherical grinding portion 22 that mates with the spherical sealing concave surface of the nuclear power plant valve. The columnar operating portion 21 may be generally cylindrical, and at least a portion of its outer surface is provided with a second anti-slip structure 211. The second anti-slip structure 211 includes, but is not limited to, textures, uneven surfaces, or other structures that increase friction. The columnar operating portion 21 is easy for workers to grip, and its diameter may be similar to or smaller than that of the spherical grinding portion 22.

[0035] In some embodiments, the second grinding member 20 includes a connecting portion 23 that connects the columnar operating portion 21 and the spherical grinding portion 22. The diameter of the connecting portion 23 is smaller than the diameter of the spherical grinding portion 22, so that the spherical surface of the spherical grinding portion 22 is more complete, and a certain space can be formed between the spherical grinding portion 22 and the columnar operating portion 21 to avoid jamming when the spherical grinding portion 22 is engaged with the spherical sealing concave surface of the nuclear power plant valve.

[0036] In some embodiments, the diameter of the spherical grinding part 22 is 33.72 mm, 33.74 mm, 33.75 mm or 33.78 mm.

[0037] Specifically, to ensure the sealing effect of the spherical sealing concave surface of nuclear power plant valves, it is essential to ensure the uniformity of the spherical sealing concave surface dimensions after grinding and repair. Therefore, the dimensions of the spherical grinding part 22 of the second grinding tool 20 used in the grinding process must be completely consistent with the original design dimensions of the spherical sealing concave surface of the nuclear power plant valves to prevent changes in the spherical surface dimensions due to unreasonable grinding tool dimensions. The influence of the grinding paste size on the dimensions of the spherical sealing concave surface of the nuclear power plant valves needs to be considered during the grinding process.

[0038] The spherical sealing concave surface of nuclear power plant valves has high dimensional requirements and high requirements for the fit of the sealing surface after grinding. Furthermore, the grinding of the spherical sealing concave surface of nuclear power plant valves must be carried out using grinding paste. Therefore, the influence of the size of the grinding paste particles on the spherical surface size after grinding must also be considered during the grinding process.

[0039] For example, taking F600 polishing paste as an example, its particle diameter is: 25.4 ÷ 600 = 0.04 mm. The mesh number of polishing paste refers to the number of particles per inch. Therefore, the size of one particle is one inch divided by the corresponding mesh number. One inch is 25.4 mm. Furthermore, when using polishing paste of this mesh number to polish the concave spherical seal of a nuclear power plant valve, the spherical size after polishing (assuming its spherical diameter is d1) is no longer the spherical size of the polishing tool (assuming the diameter of the spherical polishing part 22 of the second polishing part 20 is d2). Instead, it is the size of the spherical polishing part 22 of the second polishing part 20 minus the size of the polishing paste. That is to say: d1 = d2 + (0.04 x 2) mm.

[0040] Furthermore, considering the characteristics of the spherical sealing concave surface of nuclear power plant valves, when using the second grinding part 20 to grind the spherical sealing concave surface of the nuclear power plant valve, it is necessary to ensure that the spherical grinding part 22 of the second grinding part 20 is smooth and clean. If the surface of the spherical grinding part 22 is rough, it is very easy to cause scratches on the spherical sealing concave surface of the nuclear power plant valve during the grinding process, affecting the grinding and repair effect. Currently, the minimum precision of commonly used grinding paste is 0.01mm. To ensure the accuracy of the actual dimensions of the second grinding part 20, the machining precision of the second grinding part 20 should be at least one grade higher than the minimum precision of the second grinding part 20. That is to say, theoretically, the machining precision of the second grinding part 20 should not be less than 0.001mm. However, considering the actual situation, after surveying the processing capabilities of existing machine tools on the market, to ensure the feasibility of the processing plan, the machining precision of the second grinding part 20 can be set at 0.002~0.005mm.

[0041] In summary, the dimensions of the spherical grinding portion 22 of the second grinding element 20 can be as follows:

[0042] Table 2

[0043]

[0044] Of course, the dimensions of the spherical grinding part 22 can be adjusted appropriately according to the actual dimensions of the spherical sealing concave surface of the nuclear power plant valve; no specific limitation is made here.

[0045] In some embodiments, both the first grinding element 10 and the second grinding element 20 are made of brass.

[0046] In some embodiments, the first grinding element 10 is an integral structure, and the second grinding element 20 is also an integral structure.

[0047] The table below shows the valve sealing performance test results after the first grinding part 10 and the second grinding part 20 were applied to the sealing surfaces.

[0048] Table 3

[0049]

[0050] The table below shows the valve sealing test results after the sealing surface was repaired by grinding with abrasive paper.

[0051] Table 4

[0052]

[0053] After on-site verification, the first grinding component 10 and the second grinding component 20 can significantly improve the grinding effect of the spherical sealing surface, and the grinding speed is faster, the probability of repeated grinding is low, the maintenance time is shorter, and the equipment maintenance efficiency is effectively improved.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0055] 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 grinding device for the spherical sealing surface of a nuclear power plant valve, characterized in that, It includes a first grinding element (10) for grinding the convex surface of the spherical seal of a nuclear power plant valve, and a second grinding element (20) for grinding the concave surface of the spherical seal of a nuclear power plant valve; The first grinding component (10) includes a columnar body (11), and the first end of the columnar body (11) is recessed to form a spherical grinding groove (12) for cooperating with the spherical sealing convex surface of the nuclear power plant valve; the second grinding component (20) includes a columnar operating part (21), and one end of the columnar operating part (21) is provided with a spherical grinding part (22) that cooperates with the spherical sealing concave surface of the nuclear power plant valve.

2. The grinding device for the spherical sealing surface of a nuclear power plant valve according to claim 1, characterized in that, At least a portion of the outer surface of the columnar body (11) is provided with a first anti-slip structure (111).

3. The grinding device for the spherical sealing surface of a nuclear power plant valve according to claim 1, characterized in that, The columnar body (11) is provided with a through hole (112), which penetrates the end face of the second end of the columnar body (11) and is axially connected to the spherical grinding groove (12).

4. The grinding device for the spherical sealing surface of a nuclear power plant valve according to claim 1, characterized in that, The diameter of the spherical grinding groove (12) is 33.82 mm, 33.85 mm, 33.86 mm or 33.88 mm.

5. The grinding apparatus for the spherical sealing surface of a nuclear power plant valve according to any one of claims 1 to 4, characterized in that, The first grinding part (10) is an integral structure.

6. The grinding device for the spherical sealing surface of a nuclear power plant valve according to claim 1, characterized in that, At least a portion of the outer surface of the columnar operating part (21) is provided with a second anti-slip structure (211).

7. The grinding device for the spherical sealing surface of a nuclear power plant valve according to claim 1, characterized in that, The second grinding element (20) includes a connecting part (23) that connects the columnar operating part (21) and the spherical grinding part (22); the diameter of the connecting part (23) is smaller than the diameter of the spherical grinding part (22).

8. The grinding device for the spherical sealing surface of a nuclear power plant valve according to claim 1, characterized in that, The diameter of the spherical grinding part (22) is 33.72 mm, 33.74 mm, 33.75 mm or 33.78 mm.

9. The grinding apparatus for the spherical sealing surface of a nuclear power plant valve according to any one of claims 6 to 8, characterized in that, The second grinding element (20) is an integral structure.

10. The grinding device for the spherical sealing surface of a nuclear power plant valve according to claim 1, characterized in that, Both the first grinding element (10) and the second grinding element (20) are made of brass.

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