Auxiliary detection device

Abstract

The utility model discloses an auxiliary detection device, which is used for assisting the detection of a flange sealing surface of a pressure vessel of a nuclear power station, a flange sealing groove is formed on the pressure vessel, a flange sealing surface is formed at the bottom of the flange sealing groove, a sealing area for placing a sealing ring is arranged on the flange sealing surface, and the auxiliary detection device comprises a main body, the main body is provided with a third surface, the third surface is matched with the side wall of the flange sealing groove, a detection through hole is formed in the main body, and when the third surface abuts against the side wall of the flange sealing groove, the position of the detection through hole coincides with at least part of the sealing area. Therefore, when the auxiliary detection device is used for detecting the sealing surface of the flange, the third surface abuts against the side wall of the sealing groove of the flange, so that the position of the detection through hole corresponds to the sealing area, a detector can detect the area through the detection through hole without detecting the whole sealing surface of the flange, and the detection efficiency is improved. Therefore, the detection efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of reactor vessel testing technology, and in particular to an auxiliary testing device. Background Technology

[0002] In pressurized water reactor nuclear power plants, the reactor pressure vessel plays a crucial role. It confines the nuclear fission reaction of nuclear fuel within a closed space, ensuring the safe operation of the nuclear reaction and serving as the second line of defense against radioactive material leakage. The reactor pressure vessel consists of two parts: the vessel assembly and the top cover assembly. The top cover assembly is connected to the top of the vessel assembly. Both the top cover assembly and the vessel assembly have flange sealing grooves. These two flange sealing grooves face each other, and their inner walls form the two flange sealing surfaces of the pressure vessel. A sealing ring is sandwiched between the two flange sealing surfaces, forming the sealed area of ​​the pressure vessel. During the operation of the nuclear power plant, the quality of the flange sealing surfaces plays a critical role. Defects in the flange sealing surfaces can lead to leaks in the reactor pressure vessel, resulting in a shutdown of the nuclear power unit. Therefore, during scheduled reactor shutdowns and maintenance, targeted periodic inspections of the vessel flange sealing surfaces are necessary. Some technologies involve comprehensive manual visual inspection of the flange sealing surfaces. However, due to the large area of ​​the flange sealing surfaces, this method is inefficient. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an auxiliary detection device that can assist in the detection of flange sealing surfaces and improve the detection efficiency of flange sealing surfaces.

[0004] According to an embodiment of the present invention, an auxiliary detection device is used to assist in the detection of the flange sealing surface of a pressure vessel in a nuclear power plant. The pressure vessel has a flange sealing groove, and the flange sealing surface is formed at the bottom of the flange sealing groove. A sealing area for placing a sealing ring is provided on the flange sealing surface. The auxiliary detection device includes a main body, and the main body is provided with a first surface, a second surface, a third surface, and a detection through hole.

[0005] The second surface is disposed opposite to the first surface; the third surface is connected between the first surface and the second surface, and the third surface is adapted to the sidewall of the flange sealing surface; the detection through hole penetrates through the first surface and the second surface; wherein, when the third surface abuts against the sidewall of the flange sealing groove, the position of the detection through hole overlaps with at least a portion of the sealing area.

[0006] The auxiliary detection device according to the embodiments of the present utility model has at least the following beneficial effects:

[0007] The auxiliary detection device in this embodiment includes a main body with a third surface adapted to the sidewall of the flange sealing groove to be detected, and a detection through-hole connecting the first surface and the second surface. The auxiliary detection device is configured such that when the third surface abuts against the sidewall of the flange sealing groove, the position of the detection through-hole at least partially coincides with the sealing area. Therefore, when using the auxiliary detection device of this embodiment to detect the flange sealing surface, the third surface of the main body is placed against the sidewall of the flange sealing groove. At this time, the position of the detection through-hole corresponds to the sealing area, and the inspector can detect only the sealing area through the detection through-hole, without having to detect the entire flange sealing surface, thus avoiding a large inspection area and excessive inspection time.

[0008] According to some embodiments of the present invention, the auxiliary detection device further includes a plurality of support members, which are connected to the second surface and protrude outward from the second surface. Along the first direction, the sum of the projected areas of each support member is less than the area of ​​the second surface. The side of the support member that is away from the second surface is used to abut against the flange sealing surface. The first direction is the direction from the second surface to the first surface.

[0009] According to some embodiments of the present invention, the side of the support member facing away from the second surface is a spherical surface, which is used to abut against the flange sealing surface.

[0010] According to some embodiments of the present invention, the main body further has a clearance groove and an opening communicating with the clearance groove, the opening being located on the third surface.

[0011] According to some embodiments of the present invention, the handle is detachably connected to the main body.

[0012] According to some embodiments of the present invention, the auxiliary detection device further includes a handle, which is connected to the first surface of the main body and protrudes outward from the first surface.

[0013] According to some embodiments of the present invention, the support member is detachably connected to the main body.

[0014] According to some embodiments of this utility model, the main body, the support member, and the handle are connected as an integral structure.

[0015] According to some embodiments of this utility model, the detection through hole is an arc-shaped hole, and the arc of the detection through hole is set to π / 4 to π / 3.

[0016] According to some embodiments of the present invention, the detection through hole is an arc-shaped hole, and there are multiple detection through holes, with different radii for the multiple detection through holes.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 This is a partial cross-sectional view of a pressure vessel in the prior art;

[0020] Figure 2 for Figure 1 A magnified view of area A in the middle;

[0021] Figure 3 This is a schematic diagram of the auxiliary detection device according to the first embodiment of the present invention;

[0022] Figure 4 for Figure 3 A sectional view;

[0023] Figure 5 To be Figure 3 A schematic diagram of an auxiliary testing device used to inspect the flange sealing surface;

[0024] Figure 6 for Figure 5 A sectional view;

[0025] Figure 7 for Figure 3 Another sectional view;

[0026] Figure 8 This is a cross-sectional view of the auxiliary detection device according to the second embodiment of this utility model;

[0027] Figure 9 This is a schematic diagram of the auxiliary detection device according to the third embodiment of the present invention;

[0028] Figure 10 for Figure 9 A sectional view;

[0029] Figure 11 This is a schematic diagram of the auxiliary detection device according to the fourth embodiment of the present invention.

[0030] Figure label:

[0031] Pressure vessel 1000, vessel assembly 1001, top cover assembly 1002, flange sealing groove 1100, flange sealing surface 1200, sealing area 1210, side wall of flange sealing groove 1300.

[0032] Sealing ring 2000;

[0033] Body 100, first surface 110, second surface 120, third surface 130, detection through hole 140;

[0034] Support component 200, spherical surface 210;

[0035] Handle 300. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0037] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0039] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0040] In pressurized water reactor nuclear power plants, the reactor pressure vessel plays a crucial role. It confines the nuclear fission reaction of nuclear fuel within a closed space, ensuring the safe operation of the nuclear reaction and serving as the second line of defense against radioactive material leakage. The reactor pressure vessel consists of two parts: the vessel assembly and the top cover assembly. The top cover assembly is connected to the top of the vessel assembly. Both the top cover assembly and the vessel assembly have flange sealing grooves. These two flange sealing grooves face each other, and their inner walls form the two flange sealing surfaces of the pressure vessel. A sealing ring is sandwiched between the two flange sealing surfaces, forming the sealed area of ​​the pressure vessel. During the operation of the nuclear power plant, the quality of the flange sealing surfaces plays a critical role. Defects in the flange sealing surfaces can lead to leaks in the reactor pressure vessel, resulting in a shutdown of the nuclear power unit. Therefore, during scheduled reactor shutdowns and maintenance, targeted periodic inspections of the vessel flange sealing surfaces are necessary. Current technologies rely on comprehensive visual inspection of the flange sealing surfaces, but due to the large area of ​​the flange sealing surfaces, this method is inefficient.

[0041] To address the aforementioned problems, this invention proposes an auxiliary detection device capable of assisting in the detection of the flange sealing surface 1200 of a nuclear power plant pressure vessel 1000. Specifically, in the prior art, a flange sealing groove 1100 is formed on the pressure vessel 1000, the bottom of the groove forming the flange sealing surface 1200, and a sealing area 1210 for placing a sealing ring 2000 is provided on the flange sealing surface 1200. For example, the pressure vessel 1000 includes a container assembly 1001 and a top cover assembly 1002 connected to each other. The container assembly 1001 has the flange sealing groove 1100, such as... Figure 1 and Figure 2 As shown, Figure 1 This is a partial cross-sectional view of a pressure vessel in the prior art. Figure 2 for Figure 1 A magnified view of area A in the middle. Figure 2 The thick solid line is not to be interpreted as the outline of an actual component in the pressure vessel, but is only used to clearly show the location of the sealing area 1210. Alternatively, the top cover assembly 1002 in the pressure vessel 1000 may have a sealing groove, or both the vessel assembly 1001 and the top cover assembly 1002 may have flange sealing grooves 1100.

[0042] This invention will be illustrated using the flange sealing surface 1200 on the detection container assembly 1001 as an example.

[0043] Reference Figures 3 to 6 , Figure 3 This is a schematic diagram of the auxiliary detection device according to the first embodiment of the present invention. Figure 4 for Figure 3 sectional view, Figure 5 To be Figure 3 A schematic diagram of an auxiliary testing device used to inspect the flange sealing surface. Figure 6 for Figure 5 A sectional view, in which, Figure 5 The dashed lines in the text cannot be interpreted as the actual outline of the container component. Figure 6 The thick solid line in the middle is not to be interpreted as the outline of actual components in the pressure vessel, but is only used to clearly show the location of the sealing area 1210. The auxiliary detection device of this embodiment includes a main body 100, which has a first surface 110 and a second surface 120 disposed opposite to each other, and a third surface 130 located between the first surface 110 and the second surface 120 (e.g., ...). Figure 4 As shown, the third surface 130 is adapted to the side wall 1300 of the flange sealing groove. For example, in some embodiments, the side wall 1300 of the flange sealing groove is a flat surface, and the third surface 130 is a plane adapted to it.

[0044] Alternatively, as in some embodiments, the sidewall 1300 of the flange sealing surface is an arc surface, and the third surface 130 is an arc surface adapted to it. The main body 100 also has a detection through hole 140, which penetrates the first surface 110 and the second surface 120. When the third surface 130 abuts against the sidewall 1300 of the flange sealing groove, the position of the detection through hole 140 coincides with at least a portion of the sealing area 1210, making the inspection of the flange sealing surface 1200 more convenient. Specifically, it can be understood that in the flange sealing surface 1200, the sealing area 1210 that actually participates in the sealing function is the sealing area 1210 that contacts the sealing ring 2000. If the entire flange sealing surface 1200 is inspected every time, it takes a long time, and the pressure vessel 1000 is located in an area with strong radiation. Long-term operation will result in high radiation exposure for maintenance personnel, which is detrimental to their health. Using the auxiliary tool of this embodiment to inspect the flange sealing surface 1200 can effectively improve this problem. Specifically, when using the auxiliary inspection device of this embodiment to inspect the flange sealing surface 1200, the inspector places the third surface 130 of the main body 100 against the side wall 1300 of the flange sealing groove. At this time, the inspection through hole 140 corresponds to the sealing area 1210, and the width of the inspection through hole 140 is adapted to the width of the sealing area 1210. The inspector can visually inspect the sealing area 1210 through the inspection through hole 140. It can be understood that the auxiliary inspection device of this embodiment can assist inspectors in quickly locating the inspection area, thereby improving inspection efficiency, reducing the radiation dose received by inspectors, and improving the safety of the working environment. Furthermore, the auxiliary inspection device of this embodiment is simpler and more convenient to operate; both experienced professionals and beginners can quickly learn and use the tool.

[0045] It should be noted that the width of the detection through-hole 140 described above is adapted to the width of the sealing area 1210, but this should not be interpreted as the two being completely equal. The width of the detection through-hole 140 can also be slightly larger than the width of the sealing area 1210. Furthermore, the widths of the various detection through-holes 140 are not entirely the same; different widths can be machined according to actual needs to adapt to the width of the sealing area 1210. Further, the widths of the various detection through-holes 140 are also not entirely the same. For example, the multiple sealing rings 2000 used are different, so the width of the area where each sealing ring 2000 contacts the flange sealing surface 1200 is also different. Correspondingly, the widths of the multi-dimensional detection through-holes 140 provided on the main body 100 are also different to meet the detection requirements.

[0046] For example, the main body 100 is provided with a detection through hole 140 of the same size as the sealing area 1210. During the test, the third surface 130 abuts against the side wall 1300 of the flange sealing groove. The position of the detection through hole 140 is completely coincident with the sealing area 1210. The tester can test the sealing area 1210 through the detection through hole 140 without moving the main body 100.

[0047] Alternatively, the position of the detection through-hole 140 may partially coincide with the sealing area 1210. For example, if the length of the sealing area 1210 is L and the length of the detection through-hole 140 is L / n, then during testing, the entire sealing area 1210 can be tested by moving the main body 100n times along the side wall 1300 of the flange sealing groove. Specifically, in some embodiments, the detection through-hole 140 is an arc-shaped hole, and the arc of the detection through-hole 140 is set to π / 4 to π / 3. Specifically, when the volume of the pressure vessel 1000 is large, the circumference of the sealing area 1210 is long. If a detection through-hole 140 of the same size as the sealing area 1210 is provided on the main body 100, it will result in the main body 100 being too large and also resulting in insufficient overall rigidity of the main body 100, which is not only unfavorable for transportation but also for the movement of the testing personnel during use. On the other hand, if the size of the detection through-hole 140 is too small, the testing personnel will need to frequently move the main body 100 during the testing process, making the testing process cumbersome. In this embodiment, the curvature of the detection through-hole 140 is set to π / 4 to π / 3, allowing the detection through-hole 140 to be formed within a smaller main body 100. This avoids making the main body 100 too large while ensuring sufficient rigidity, facilitating transportation and handling by inspection personnel. It also ensures that a larger area can be inspected with each movement of the inspection personnel, simplifying the inspection process and improving efficiency. For example, with a curvature of π / 3 for the detection through-hole 140, each movement of the main body 100 during the inspection process can complete the inspection of a π / 3 curvature sealing area 1210. That is, each movement of the main body 100 completes the inspection of 1 / 6 of the sealing area 1210. Therefore, the entire inspection process requires only six movements of the main body 100 to complete the inspection of the entire sealing area 1210. Similarly, when the arc of the detection through hole 140 is π / 4, the detection of the sealing area 1210 with an arc of π / 4 can be completed every time the main body 100 is moved during the detection process. That is, every time the main body 100 is moved, the detection of 1 / 8 of the sealing area 1210 can be completed. Therefore, the entire detection process only requires moving the main body 100 eight times to complete the detection of the entire sealing area 1210.

[0048] Reference Figure 4In some embodiments, the auxiliary detection device further includes multiple support members 200. The support members 200 are connected to the second surface 120 of the main body 100 and protrude outwards away from the second surface 120. The side of the support member 200 facing away from the second surface 120 is used to abut against the flange sealing surface 1200. Specifically, as described above, the area where the sealing ring 2000 contacts the flange sealing surface 1200 is the sealing area 1210. Correspondingly, the detection through hole 140 is an elongated through hole adapted to the sealing area 1210. To ensure that during the detection process, the second surface 120 of the main body 100 is as parallel as possible to the flange sealing surface 1200 so that the detection through hole 140 is directly opposite the sealing area 1210, especially when the sealing area is annular, a slight angle between the main body 100 and the flange sealing groove 1100 may cause the detection through hole 140 to fail to correspond to the sealing area 1210. Therefore, the processing of the second surface 120 has high requirements. In this embodiment, a support member 200 protruding from the second surface 120 is provided. The support member 200 contacts the flange sealing surface 1200. The projected area of ​​the support member 200 along the first direction (from the second surface 120 to the first surface 110) is smaller than the area of ​​the second surface 120. Therefore, compared with directly contacting the flange sealing surface 1200 through the second surface 120, the contact area between the support member 200 and the flange sealing surface 1200 in this embodiment is smaller, thereby reducing processing requirements and saving manufacturing costs.

[0049] Specifically, the number of support members 200 can be any number, such as two, three, or four, as long as it ensures that during use, the second surface 120 is parallel to the flange sealing surface 1200 through the support members 200. For example, if the end face of the support member 200 away from the main body 100 is flat, the second surface 120 can be parallel to the flange sealing surface 1200 through one flat surface of the support member 200. Therefore, when the end face of the support member 200 away from the main body 100 is flat, the auxiliary detection device can be equipped with one support member 200.

[0050] In addition, refer to Figure 4 In some embodiments, the side of the support member 200 facing away from the second surface 120 is a spherical surface 210, which is used to abut against the flange sealing surface 1200. Specifically, the spherical surface 210 makes point contact with the flange sealing surface 1200. Therefore, in this embodiment, it is only necessary to ensure the positional accuracy of the point where the support member 200 contacts the flange sealing surface 1200, thereby further reducing the processing requirements of this embodiment and saving manufacturing costs. Similarly, in some embodiments, the main body 100 also has a relief groove and an opening communicating with the relief groove, the opening being located on the third surface 130. This can reduce the area of ​​the third surface 130, thereby reducing the processing requirements of the third surface 130 and saving manufacturing costs.

[0051] Reference Figure 7 , Figure 7 for Figure 3 In another cross-sectional view, in some embodiments, the support member 200 and the main body 100 are connected as an integral structure. Specifically, for example, the support member 200 and the main body 100 are weldable metal structures, and the support member 200 and the main body 100 are formed into an integral structure by welding, or the support member 200 and the main body 100 are processed into an integral structure by machining or injection molding, thereby reducing the number of parts in the auxiliary detection device of this embodiment, thereby avoiding the situation of parts falling off during use, and thus improving the safety of the equipment. Specifically, the pressure vessel 1000 of the nuclear power plant is a high-precision vessel. If a part falls into the pressure vessel 1000 during the inspection process, if the inspector finds the fallen part, it needs to be removed, which not only increases the workload, but also leads to prolonged radiation exposure for workers. If it is not found, it may lead to safety risks during equipment operation. This embodiment can effectively solve this problem. By making the support member 200 and the main body 100 an integral structure, the auxiliary detection device of this embodiment can prevent parts from falling off during the inspection process.

[0052] In contrast, in some embodiments, the support member 200 is detachably connected to the main body 100 by means of snap-fit, threaded connection, or screw connection, such as... Figure 8 As shown, Figure 8 This is a cross-sectional view of the auxiliary testing device according to the second embodiment of the present invention. Specifically, it can be understood that in this embodiment, the support member 200 contacts the flange sealing surface 1200. After repeated use, the support member 200 will experience a certain degree of wear or compression deformation. However, since the support member 200 and the main body 100 are detachably connected in this embodiment, when the support member 200 is damaged, it can be directly disassembled and replaced, thereby reducing the usage cost of the auxiliary testing tool in this embodiment.

[0053] Reference Figure 9 and Figure 10 , Figure 9 This is a schematic diagram of the auxiliary detection device according to the third embodiment of the present invention. Figure 10 for Figure 9In some embodiments, the auxiliary testing device also includes a handle 300, which is connected to the first surface 110 of the main body 100 and protrudes outward from the first surface 110 for the user to hold. Therefore, during the testing process, the testing personnel can hold the handle 300 to move the main body 100. This makes moving the main body 100 easier and the testing of the flange sealing surface 1200 more convenient. Furthermore, holding the handle 300 prevents the auxiliary testing device from falling into the pressure vessel 1000. In some embodiments, the handle 300 and the main body 100 are integrated into a single structure through processes such as welding, machining, or injection molding (e.g.,...). Figure 10 As shown, this reduces the number of components in the auxiliary testing device of this embodiment, thereby preventing components from falling off during use and improving device safety. Furthermore, the support 200, handle 300, and main body 100 are connected as a single unit, further reducing the number of components in the auxiliary testing device of this embodiment and preventing components from falling off during use, thus improving device safety. On the other hand, it can be used directly for testing without assembly, making the auxiliary testing device of this embodiment more convenient to use.

[0054] In contrast, in some embodiments, the handle 300 is detachably connected to the body 100 via a threaded connection, snap-fit, or plug-in connection, such as... Figure 11 As shown, Figure 11 This is a schematic diagram of the auxiliary detection device according to the fourth embodiment of the present invention. Specifically, as can be seen from the above embodiments, the handle 300 protrudes from the first surface 110, thus preventing the main bodies 100 from being stacked during storage. Furthermore, since the main body 100 is a long strip structure, the handle 300 increases the local weight of the auxiliary detection device. Therefore, when the testing personnel hold the main body 100 to move the auxiliary detection device, there is a risk that the weight of the handle 300 may cause the main body 100 to deform, leading to a displacement of the detection through hole 140. In this embodiment, the detachable connection between the handle 300 and the main body 100 effectively improves this problem. Specifically, during storage, the handle 300 can be detached so that the main body 100 can be stacked. During use, the handle 300 can be detached first, and the main body 100 can be placed in the flange sealing groove 1100 to be tested, and then the handle 300 can be installed on the main body 100. This can avoid the weight of the handle 300 causing deformation of the main body 100, thereby improving the positional accuracy of the detection through hole 140. This ensures that the area observed through the detection through hole 140 is the area where the sealing ring 2000 contacts the flange sealing surface 1200, thus improving the reliability of the auxiliary testing device in this embodiment.

[0055] In some embodiments, the auxiliary detection device is a nylon structure. Specifically, nylon has good wear resistance and self-lubricating properties, and it is easy to process into various shapes and sizes, and can be molded through various processes such as injection molding, extrusion, and die casting. Therefore, the auxiliary detection device in this embodiment is a nylon structure, which makes the manufacturing of the auxiliary detection device simpler, reduces the resistance encountered during sliding, making it more convenient to use, and also has a longer service life.

[0056] Reference Figure 3 In some embodiments, the detection through-hole 140 is an arc-shaped hole, and there are multiple detection through-holes 140 with different radii. Specifically, each detection through-hole 140 is adapted to the third surface 130, that is, the multiple detection through-holes 140 are arc-shaped holes coaxially arranged with the third surface 130. When the two flange sealing grooves 1100 are provided with multiple sealing rings 2000, that is, the flange sealing surface 1200 has multiple sealing areas 1210 corresponding to the sealing rings 2000. Correspondingly, the auxiliary detection device of this embodiment is provided with multiple detection through-holes 140, as shown in the attached figure. Figure 3 The device includes two detection through holes 140. In use, the positions of the two detection through holes 140 correspond one-to-one with the positions of the two sealing areas 1210. Therefore, during the testing process, only the auxiliary testing device of this embodiment is needed to complete the testing of the two sealing areas 1210, making the auxiliary testing device of this embodiment more convenient to use. Furthermore, for different pressure vessels 1000, the radius of the flange sealing groove 1100 is not entirely the same, and this embodiment has multiple detection through holes 140 with different radii, thus enabling the testing of flange sealing grooves 1100 with different radii, thereby improving the practicality of the auxiliary testing device of this embodiment.

[0057] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, in the description of the present invention, the reference to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicates that the 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. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

Claims

1. An auxiliary detection device, characterized in that, For assisting in the inspection of the flange sealing surface of a pressure vessel in a nuclear power plant, the pressure vessel has a flange sealing groove formed on it, the bottom of the flange sealing groove forms the flange sealing surface, and the flange sealing surface is provided with a sealing area for placing a sealing ring. The auxiliary inspection device includes a main body, and the main body is provided with: First surface; The second surface is disposed opposite to the first surface; A third surface is connected between the first surface and the second surface, and the third surface is adapted to the sidewall of the flange sealing surface; as well as A detection through-hole, the detection through-hole penetrating the first surface and the second surface; Wherein, when the third surface abuts against the sidewall of the flange sealing groove, the position of the detection through hole overlaps with at least a portion of the sealing area.

2. The auxiliary detection device according to claim 1, characterized in that, The auxiliary detection device also includes multiple support members, which are connected to the second surface and protrude outwards away from the second surface. Along the first direction, the sum of the projected areas of each support member is less than the area of ​​the second surface. The side of the support member away from the second surface is used to abut against the flange sealing surface. The first direction is the direction from the second surface to the first surface.

3. The auxiliary detection device according to claim 2, characterized in that, The support member is detachably connected to the main body.

4. The auxiliary detection device according to claim 2, characterized in that, The side of the support member facing away from the second surface is a spherical surface, which is used to abut against the flange sealing surface.

5. The auxiliary detection device according to any one of claims 1 to 4, characterized in that, The main body also has a clearance groove and an opening communicating with the clearance groove, the opening being located on the third surface.

6. The auxiliary detection device according to claim 2, characterized in that, The auxiliary detection device also includes a handle. The handle is connected to the first surface of the body and protrudes outward from the first surface.

7. The auxiliary detection device according to claim 6, characterized in that, The handle is detachably connected to the body.

8. The auxiliary detection device according to claim 6, characterized in that, The main body, the support member, and the handle are integrally formed.

9. The auxiliary detection device according to any one of claims 1 to 4, characterized in that, The detection through hole is an arc-shaped hole, and the arc of the detection through hole is set to π / 4 to π / 3.

10. The auxiliary detection device according to any one of claims 1 to 4, characterized in that, The detection through hole is an arc-shaped hole, and there are multiple detection through holes, with different radii for each of the multiple detection through holes.

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