Protective structure for metal welding part of thermal power plant

Abstract

The utility model relates to the technical field of thermal power plant metal part processing, and discloses a protection structure for a thermal power plant metal welding part, which comprises a thermal power plant metal pipeline and four first connecting rings which are equally divided into two groups and are sleeved on the outer side of the thermal power plant metal pipeline; the second connecting rings are welded on the surfaces of one sides of the first connecting rings, and the number and the distribution positions of the second connecting rings are matched with those of the first connecting rings; the high-temperature-resistant protection part is arranged between the two second connecting rings on the same cross section and wraps the outer side of the weld joint of the thermal power plant metal pipeline so as to protect the weld joint; and the fixing pieces are arranged on the outer sides of the two adjacent first connecting rings and used for fixing the first connecting rings to the outer side of the thermal power plant metal pipeline. According to the protection structure for the thermal power plant metal welding part, the benefits of corrosion protection, welding quality protection, impurity blocking, safety improvement and the like can be further achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of metal parts processing in thermal power plants, in particular to a protective structure for metal welding parts in thermal power plants. Background Art

[0002] The metal pipes in thermal power plants are mainly used to transport media such as water vapor, flue gas, cooling water, and withstand working conditions such as high temperature and high pressure. During the use of metal pipes, pipe damage, leakage or aging may occur. For these problems, the damaged pipes need to be repaired. Welding can be used to repair damaged pipe parts. Or, with the development of thermal power plant technology and changes in operating requirements, the pipeline system may need to be modified and upgraded, which may include adding or adjusting pipeline branches, increasing pipeline diameter or capacity, etc., which also requires appropriate welding.

[0003] However, after welding, the metal welded parts in the prior art are exposed to the thermal power plant environment of high temperature, humidity and chemical gas, and are easily affected by corrosion and oxidation, which will lead to structural weakening, functional loss or failure of the welded parts. At the same time, impurities, dust or particulate matter in the thermal power plant environment are easy to adhere to the weld, affecting the quality and reliability of the weld. Therefore, there are certain disadvantages. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] The utility model aims to add a protective structure to the welding part of metal welded parts to provide safety protection, corrosion and oxidation resistance, improve welding quality and reduce mechanical damage, and proposes a protective structure for metal welded parts in thermal power plants.

[0006] (II) Technical solution

[0007] The technical solution of the utility model to solve the above technical problems is as follows:

[0008] A protective structure for metal welded parts of a thermal power plant, including a metal pipe of the thermal power plant,

[0009] The first connecting rings are four in number and are equally divided into two groups, and are all sleeved on the outside of the metal pipe of the thermal power plant;

[0010] A second connecting ring, welded to one side surface of the first connecting ring, and the number and distribution position of the second connecting ring are adapted to the first connecting ring;

[0011] The high temperature resistant protective member is arranged between the two second connecting rings on the same cross section, and is wrapped around the outside of the weld of the metal pipeline of the thermal power plant to protect the weld;

[0012] The fixing piece is arranged on the outer sides of two adjacent first connecting rings and is used to fix the first connecting rings to the outer sides of the metal pipes of the thermal power plant.

[0013] On the basis of the above technical solution, the present invention can also be improved as follows.

[0014] Furthermore, a magnetic part is provided at the contact point of two adjacent first connecting rings, and the two adjacent magnetic parts are attracted to each other, wherein the two adjacent first connecting rings are combined together to form a circular ring, and a sealing gasket is provided on the inner side of the circular ring, wherein one side surface of the sealing gasket is in contact with the outer side of the metal pipe of the thermal power plant.

[0015] Furthermore, the shape of the second connecting ring is the same as that of the first connecting ring, both of which are arranged in a semi-arc shape, wherein two connecting seats are welded on each second connecting ring, a support rod is arranged through the connecting seat, and the other end of the support rod passes through another connecting seat on the same cross section.

[0016] Furthermore, both ends of the support rod are processed with external threads on the outside, wherein at least two nuts are threadedly connected to the end of the support rod, wherein two adjacent nuts are respectively located on the left and right sides of the connecting seat.

[0017] Furthermore, the high temperature resistant protective element comprises:

[0018] A high temperature resistant dustproof part, one end of which is fixedly mounted on a side surface of one of the second connecting rings, and the other end of which is fixedly connected to a side surface of another second connecting ring on the same cross section, and the number of the parts is two;

[0019] A rubber sealing member, arranged at the edge of the high temperature resistant dustproof member, and matching the lateral length of the high temperature resistant dustproof member; and

[0020] The NdFeB magnet is embedded in the rubber seal and is used to connect the edges of two high temperature resistant dustproof parts together.

[0021] Furthermore, at least two sleeve rings are attached to the high temperature resistant dustproof part, wherein the sleeve rings are sleeved on the outer side of the support rod.

[0022] Furthermore, the fixing member includes:

[0023] A first arc-shaped ring, sleeved on the outer side of the first connecting ring;

[0024] A second arc-shaped ring, hinged to the end of the first arc-shaped ring, and capable of relative rotational displacement with the first arc-shaped ring;

[0025] A threaded rod, hinged to the other end of the first arc-shaped ring and connected to the second arc-shaped ring, capable of relative rotational displacement with the first arc-shaped ring; and

[0026] The hand-tightening nut is threadedly connected to the outer side of the threaded rod, and is used to connect the first arc ring and the second arc ring to the outer side of the first connecting ring, so as to limit and fix the first connecting ring.

[0027] Furthermore, one end of the second arc-shaped ring close to the threaded rod is processed with an opening arranged in a U shape, wherein the threaded rod can be displaced into the opening.

[0028] Furthermore, a connecting screw is welded on one side surface of the first arc-shaped ring, and a connecting nut is threadedly connected to the connecting screw.

[0029] (III) Beneficial effects

[0030] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0031] Since the utility model adopts the technical means of the first connecting ring, the second connecting ring, the high-temperature resistant protective part and the fixing part, after the welding of the metal pipe of the thermal power plant is completed, the first connecting ring is sleeved next to the welding point, and the high-temperature resistant protective part can be connected to the first connecting ring in combination with the use of the second connecting ring, and the weld or the weld is covered by the high-temperature resistant protective part to isolate the weld from the external environment, reduce the contact with moisture and oxygen, and thus reduce the possibility of corrosion and oxidation, which also helps to improve the quality, strength and sealing performance of the weld, ensure the reliability of the welded connection, and act as a protective barrier in the weld or the weld, reduce the risk of mechanical damage to the welded parts, and extend their service life, finally, the first connecting ring is quickly fixed to the outside of the metal pipe by the fixing part, so as to complete the fixing and limiting of the first connecting ring and the high-temperature resistant protective part, effectively solving the technical problems of the protective structure of the metal welded parts of the thermal power plant in the prior art, thereby achieving the benefits of providing corrosion protection, welding quality protection, impurity blocking and safety improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the overall connection structure of the utility model;

[0033] Figure 2 This is a schematic diagram of the connection structure between the second connecting ring and the high temperature resistant protective member of the utility model;

[0034] Figure 3 It is a schematic diagram of the cross-sectional connection structure between the second connecting ring and the high temperature resistant protective member of the utility model;

[0035] Figure 4It is a schematic diagram of the overall connection structure of the fixing piece of the utility model.

[0036] In the figure: 1. Metal pipe of thermal power plant; 2. First connecting ring; 3. Second connecting ring; 4. High temperature resistant protective part; 41. High temperature resistant dustproof part; 42. Rubber sealing part; 43. NdFeB magnet; 5. Fixing part; 51. First arc ring; 52. Second arc ring; 53. Threaded rod; 54. Hand-tightening nut; 6. Magnetic part; 7. Sealing gasket; 8. Connecting seat; 9. Support rod; 10. Nut; 11. Sleeve ring; 12. Connecting screw; 13. Connecting nut. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] Combination Figure 1-Figure 4 As shown, the utility model is a protective structure for metal welding parts of a thermal power plant, comprising a metal pipeline 1 of the thermal power plant,

[0039] The first connecting rings 2 are four in number and are equally divided into two groups, and are all mounted on the outer side of the metal pipe 1 of the thermal power plant;

[0040] The second connecting ring 3 is welded on one side surface of the first connecting ring 2, and the number and distribution position of the second connecting ring 3 are adapted to the first connecting ring 2;

[0041] The high temperature resistant protective member 4 is arranged between the two second connecting rings 3 on the same cross section, and is wrapped around the outside of the weld of the metal pipe 1 of the thermal power plant to protect the weld;

[0042] The fixing member 5 is arranged on the outer side of two adjacent first connecting rings 2, and is used to fix the first connecting ring 2 to the outer side of the metal pipe 1 of the thermal power plant.

[0043] After the welding of the metal pipe of the thermal power plant is completed, the first connecting ring 2 is sleeved next to the welding point. In conjunction with the use of the second connecting ring 3, the high-temperature resistant protective part 4 can be connected to the first connecting ring 2, and the weld or the welding point is covered by the high-temperature resistant protective part 4. Finally, the first connecting ring 2 is quickly fixed to the outside of the metal pipe through the fixing part 5, and the fixing and limiting of the first connecting ring 2 and the high-temperature resistant protective part 4 are completed. In order to extend the overall service life, the first connecting ring 2 and the second connecting ring 3 are both made of metal material so that they will not be damaged by temperature. At the same time, the protection of the welding point of the metal pipe of the thermal power plant is listed in this application. The protection structure is also applicable to other metal welded parts in the thermal power plant, such as metal support components and metal connecting components in the thermal power plant. When it is applicable to other metal welded parts, it is only necessary to change the size and shape of the first connecting ring 2, the second connecting ring 3 and the fixing part 5. The specific protection principle is the same as the protection method of the welding point of the metal pipe 1 of the thermal power plant.

[0044] In a preferred embodiment, the present invention can be further configured as follows: Figure 1 , Figure 3 As shown; a magnetic member 6 is provided at the contact point of two adjacent first connecting rings 2, and the two adjacent magnetic members 6 are attracted to each other, wherein the two adjacent first connecting rings 2 are combined together to form a circular ring, and a sealing gasket 7 is provided on the inner side of the circular ring, wherein one side surface of the sealing gasket 7 is in contact with the outer side of the metal pipe 1 of the thermal power plant, wherein the magnetic member 6 can be embedded in the first connecting ring 2, and a hole for installing the magnetic member 6 is processed on the end of the first connecting ring 2, and the magnetic member 6 is interference connected in the hole, and the magnetic member 6 is preferably a rectangular magnet. By providing the magnetic member 6, the two adjacent first connecting rings 2 can be attracted together when they are close to each other, so as to facilitate the subsequent installation of the fixing member 5, wherein the two adjacent first connecting rings 2 are combined together to form a circular ring, so that its shape is adapted to the shape of the outer side of the metal pipe 1 of the thermal power plant, and a sealing gasket 7 is further provided, which can reduce the gap between the first connecting ring 2 and the metal pipe 1 of the thermal power plant, and prevent impurities, dust or particulate matter inside the thermal power plant from adhering to the welding point.

[0045] In a preferred embodiment, the present invention can be further configured as follows: Figure 1 , Figure 2As shown; the shape of the second connecting ring 3 is the same as that of the first connecting ring 2, both of which are semi-arc-shaped, wherein two connecting seats 8 are welded on each second connecting ring 3, and a support rod 9 is arranged through the connecting seat 8, and the other end of the support rod 9 passes through another connecting seat 8 on the same cross section, wherein there are a total of eight connecting seats 8, which are equally divided on the first connecting rings 2 on the left and right sides, and are distributed equidistantly in a circular shape as a whole, and support rods 9 are further arranged to position the connecting seats 8 on the same cross section to avoid twisting between them, resulting in the inability of the high-temperature resistant protective component 4 to effectively cover the welding points of the metal pipes 1 of the thermal power plant, so that the support rods 9 are arranged to increase the overall protection effect to a certain extent.

[0046] In a preferred embodiment, the present invention can be further configured as follows: Figure 1 , Figure 2 As shown; external threads are processed on the outer sides of both ends of the support rod 9, wherein at least two nuts 10 are threadedly connected to the ends of the support rod 9, wherein two adjacent nuts 10 are respectively located on the left and right sides of the connecting seat 8, wherein the inner side of the nut 10 is provided with an internal thread adapted to the external thread, wherein the internal thread is not shown in the figure, and the external thread is folded by the nut 10 and cannot be clearly reflected, the nut 10 is rotated on the outer side of the support rod 9, so that it can be threadedly connected to the end of the support rod 9, and the number of nuts 10 is further limited, that is, the distance between the two second connecting rings 3 on the same cross section can be limited, so that it can be flexibly changed according to actual conditions, when the welding part on the metal pipe is longer, the distance between the two second connecting rings 3 on the same cross section can be slightly farther, conversely, the distance between the two second connecting rings 3 on the same cross section can be slightly closer.

[0047] In a preferred embodiment, the present invention can be further configured as follows: Figure 2 , Figure 3 As shown; the high temperature protection member 4 comprises:

[0048] A high temperature resistant dustproof member 41, one end of which is fixedly mounted on a side surface of one of the second connecting rings 3, and the other end of which is fixedly connected to a side surface of another second connecting ring 3 on the same cross section, and two of them are provided;

[0049] A rubber seal 42 is provided at the edge of the high temperature resistant dustproof member 41 and matches the lateral length of the high temperature resistant dustproof member 41; and

[0050] The NdFeB magnet 43 is embedded in the rubber seal 42, which is used to connect the edges of the two high-temperature resistant dustproof parts 41 together, wherein the high-temperature resistant dustproof parts 41 can be made of high-temperature nano-filtration materials, which have the characteristics of dustproof, breathable and high-temperature resistant. These materials can achieve higher filtration efficiency through nano-pore structure, and have a certain temperature stability, which is suitable for the dustproof and breathable requirements of the metal pipe welding of thermal power plants. The reason why the metal pipe 1 welding of thermal power plants is ventilated is that if the temperature of the welding place cannot be ventilated and cooled for a long time, the metal material at the welding place may undergo changes in the lattice structure, resulting in embrittlement of the weld, which may reduce the strength of the welding place and toughness, increasing the risk of fracture. The material used can well avoid this phenomenon. At the same time, the connection structure between the rubber seal 42 and the NdFeB magnet 43 is similar to the magnetic sealing strip connection structure on the refrigerator door in the prior art. A cavity is opened in the rubber seal 42, and a NdFeB magnet 43 is installed in the cavity. The two NdFeB magnets 43 are adsorbed together to combine the two high-temperature resistant dustproof parts 41 into a cylindrical shape, so that it can better cover the outside of the metal pipe 1 of the thermal power plant, thereby improving the overall protection effect. The use of the rubber seal 42 can further ensure the sealing of the connection and prevent impurities, dust or particulate matter inside the thermal power plant from adhering to the welding point.

[0051] In a preferred embodiment, the present invention can be further configured as follows: Figure 1 As shown; at least two sleeve rings 11 are pasted on the high temperature dustproof part 41, wherein the sleeve ring 11 is sleeved on the outside of the support rod 9. By providing the sleeve ring 11, the high temperature dustproof part 41 in the middle position can be lifted and supported to avoid the collapse of the high temperature dustproof part 41 when protecting the welding parts of the metal pipelines of the thermal power plant. At the same time, the inner diameter of the sleeve ring 11 should be larger than the outer diameter of the support rod 9.

[0052] In a preferred embodiment, the present invention can be further configured as follows: Figure 1 , Figure 4 As shown; the fixing member 5 comprises:

[0053] The first arc-shaped ring 51 is sleeved on the outer side of the first connecting ring 2;

[0054] The second arc ring 52 is hinged to the end of the first arc ring 51 and can rotate relative to the first arc ring 51;

[0055] The threaded rod 53 is hinged on the other end of the first arc ring 51 and is connected to the second arc ring 52 so as to be rotatable relative to the first arc ring 51; and

[0056] The hand-tightening nut 54 is threadedly connected to the outer side of the threaded rod 53, and is used to connect the first arc ring 51 and the second arc ring 52 to the outer side of the first connecting ring 2 to limit and fix the first connecting ring 2. The inner sides of the first arc ring 51 and the second arc ring 52 are provided with rubber friction pads, and the purpose is to increase the friction between the first arc ring 51 and the second arc ring 52 and the first connecting ring 2 to avoid relative displacement between the two when the first connecting ring 2 is fixed and limited. When the first connecting ring 2 is fixed, the hand-tightening nut 54 can be rotated, and the hand-tightening nut 54 is rotated and displaced on the outer side of the threaded rod 53. When the first arc ring 51 and the second arc ring 52 are completely pressed to the outer side of the first connecting ring 2, the hand-tightening nut 54 can be no longer rotated continuously, wherein pins are provided on both ends of the first arc ring 51, and the threaded rod 53 and the hand-tightening nut 54 are hinged to each other with the first arc ring 51 through pins.

[0057] In a preferred embodiment, the present invention can be further configured as follows: Figure 1 , Figure 4 As shown; an end of the second arc ring 52 close to the threaded rod 53 is processed with a U-shaped opening, wherein the threaded rod 53 can be moved into the opening. By providing an opening on the second arc ring 52, the threaded rod 53 can be rotated to the inner side of the opening during rotation, so that the threaded rod 53 can be connected to the second arc ring 52. By manually tightening the end of the nut 54 against the surface of the second arc ring 52, the first arc ring 51 and the second arc ring 52 can be connected to each other.

[0058] In a preferred embodiment, the present invention can be further configured as follows: Figure 1 , Figure 4 As shown; a connecting screw 12 is welded on the surface of one side of the first arc ring 51, and a connecting nut 13 is threadedly connected to the connecting screw 12. By providing the connecting screw 12 and the connecting nut 13, when fixing the protective structure, it can also be fixed to other metal parts of the thermal power plant through the connecting screw 12 and the connecting nut 13, thereby further improving the overall fixing effect, avoiding the overall displacement, and greatly strengthening the protection of the welding points of the metal welded parts.

[0059] The specific working principle of the protective structure for metal welding parts of a thermal power plant of the utility model is as follows:

[0060] One of the high temperature dustproof parts 41 is placed on the outside of the metal pipe 1 of the thermal power plant near the place where the welding is completed. At this time, the first connecting ring 2 can be attached to the outside of the metal pipe of the thermal power plant. Then another high temperature dustproof part 41 is placed on the outside of the metal pipe of the thermal power plant, wherein the ends of the two adjacent first connecting rings 2 are close to each other. Under the mutual adsorption of the magnetic part 6, the two adjacent first connecting rings 2 can be connected together. At the same time, under the mutual adsorption force of the two NdFeB magnets 43, the two high temperature dustproof parts 41 can be combined into a cylindrical shape, which is covered as a whole on the outside of the welding place of the metal pipe 1 of the thermal power plant to protect the welding place of the metal pipe 1 of the thermal power plant. With the use of the rubber seal 42, the sealing of the connection can be further guaranteed to prevent impurities, dust or particulate matter inside the thermal power plant from adhering to the welding place;

[0061] At the same time, the distance between the two second connecting rings 3 can be adjusted according to actual conditions to adapt to welding places of different lengths. Then, the first arc ring 51 is placed on the outside of the first connecting ring 2, and the second arc ring 52 is rotated so that the second arc ring 52 bypasses the outside of the first connecting ring 2. The threaded rod 53 is placed on the inside of the opening of the second arc ring 52, and the hand-tightening nut 54 is rotated. The end of the hand-tightening nut 54 is used to abut against the second arc ring 52 for displacement. When the first arc ring 51 and the second arc ring 52 are completely pressed to the outside of the first connecting ring 2, the hand-tightening nut 54 can be stopped from rotating, so that the protective structure can be fixed to the outside of the welding place of the metal welding parts of the thermal power plant, thereby providing protection for the welding places of the metal welding parts of the thermal power plant.

[0062] A connecting screw 12 and a connecting nut 13 are also provided, and the connecting screw 12 and the connecting nut 13 can also be used to fix on other metal parts of the thermal power plant, providing further positioning for the overall fixation.

[0063] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0064] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A protective structure for metal welded parts in a thermal power plant, comprising a metal pipe (1) in a thermal power plant, characterized in that: The first connecting rings (2) are four in number and are equally divided into two groups, and are all mounted on the outer side of the metal pipe (1) of the thermal power plant; A second connecting ring (3) is welded to one side surface of the first connecting ring (2), and the number and distribution position of the second connecting ring (3) are matched with those of the first connecting ring (2); A high temperature resistant protective member (4) is arranged between two second connecting rings (3) on the same cross section and is wrapped around the outside of the weld of the metal pipe (1) of the thermal power plant to protect the weld; A fixing member (5) is arranged on the outside of two adjacent first connecting rings (2) and is used to fix the first connecting rings (2) to the outside of the metal pipe (1) of the thermal power plant.

2. A protective structure for metal welded parts in a thermal power plant according to claim 1, characterized in that: A magnetic member (6) is provided at the contact point between two adjacent first connecting rings (2), and the two adjacent magnetic members (6) are attracted to each other, wherein the two adjacent first connecting rings (2) are combined together to form a circular ring, and a sealing gasket (7) is provided on the inner side of the circular ring, wherein one side surface of the sealing gasket (7) is in contact with the outer side of the metal pipe (1) of the thermal power plant.

3. A protective structure for metal welded parts in a thermal power plant according to claim 2, characterized in that: The shape of the second connecting ring (3) is the same as that of the first connecting ring (2), and both are arranged in a semi-arc shape, wherein two connecting seats (8) are welded on each second connecting ring (3), and a support rod (9) is arranged through the connecting seat (8), and the other end of the support rod (9) passes through another connecting seat (8) on the same cross section.

4. A protective structure for metal welded parts in a thermal power plant according to claim 3, characterized in that: The outer sides of both ends of the support rod (9) are processed with external threads, wherein at least two nuts (10) are threadedly connected to the ends of the support rod (9), wherein two adjacent nuts (10) are respectively located on the left and right sides of the connecting seat (8).

5. The protective structure for metal welded parts of a thermal power plant according to claim 3, characterized in that: The high temperature resistant protective member (4) comprises: A high temperature resistant dustproof part (41), one end of which is fixedly mounted on a side surface of one of the second connecting rings (3), and the other end of which is fixedly connected to a side surface of another second connecting ring (3) on the same cross section, and two of which are provided; a rubber sealing member (42) disposed at the edge of the high temperature resistant dustproof member (41) and matching the transverse length of the high temperature resistant dustproof member (41); and The neodymium iron boron magnet (43) is embedded in the rubber sealing member (42) and is used to connect the edges of the two high temperature resistant dustproof members (41) together.

6. A protective structure for metal welded parts in a thermal power plant according to claim 5, characterized in that: No less than two sleeve rings (11) are pasted on the high temperature resistant dustproof part (41), wherein the sleeve rings (11) are sleeved on the outer side of the support rod (9).

7. The protective structure for metal welded parts of a thermal power plant according to claim 1, characterized in that: The fixing member (5) comprises: A first arc-shaped ring (51), sleeved on the outer side of the first connecting ring (2); A second arc-shaped ring (52) is hinged on the end of the first arc-shaped ring (51) and can rotate relative to the first arc-shaped ring (51); A threaded rod (53) is hinged on the other end of the first arc-shaped ring (51) and is connected to the second arc-shaped ring (52) so as to be capable of relative rotational displacement with the first arc-shaped ring (51); and The hand-tightening nut (54) is threadedly connected to the outer side of the threaded rod (53) and is used to connect the first arc-shaped ring (51) and the second arc-shaped ring (52) to the outer side of the first connecting ring (2) to limit and fix the first connecting ring (2).

8. The protective structure for metal welded parts of a thermal power plant according to claim 7, characterized in that: An opening in a U-shape is processed at one end of the second arc-shaped ring (52) close to the threaded rod (53), wherein the threaded rod (53) can be moved into the opening.

9. The protective structure for metal welded parts of a thermal power plant according to claim 7, characterized in that: A connecting screw (12) is welded on one side surface of the first arc-shaped ring (51). A connecting nut (13) is threadedly connected to the connecting screw rod (12).

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