A forged-welded composite forming converter transformer oil tank

Abstract

The application provides a forged and welded composite forming converter transformer oil tank, which comprises two disc-shaped end face wall plates arranged oppositely and at intervals, two lower side bent plates arranged on the lower side between the two disc-shaped end face wall plates, and two upper side bent plates arranged on the upper side between the two disc-shaped end face wall plates. The two ends of the two lower side bent plates are connected to the connecting side edges of the two disc-shaped end face wall plates respectively, and the two ends of the two upper side bent plates are connected to the connecting side edges of the two disc-shaped end face wall plates respectively. The oil tank overall bearing frame is formed by the two disc-shaped end face wall plates, the two lower side bent plates and the two upper side bent plates. The corner positions of the oil tank overall bearing frame are all integral structural members, and the bearing connecting seams are moved to the non-corner positions. Meanwhile, the oil tank overall bearing frame contains all the tank corner positions, so that the poor stress conditions of the edges and corners in the converter transformer oil tank are all an integral whole, and the structural strength of the oil tank is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and more specifically, to a converter transformer oil tank formed by a forging and welding composite molding process. Background Technology

[0002] As a crucial component of high-voltage direct current (HVDC) transmission systems, converter transformers are vital components. Failures in these transformers often lead to system outages and significant economic losses; therefore, their safe and stable operation is paramount for the entire system. The converter transformer tank is the outer casing of the transformer, housing the core and coils and filled with transformer oil. The tank must withstand mechanical strength tests at a vacuum pressure of 13.3 Pa and a positive pressure of 0.12 MPa to protect the internal equipment. During an arcing fault in the transformer, various flammable gases are generated, increasing the internal pressure of the tank. When this pressure exceeds the tank's allowable pressure, it can cause ruptures at weak points, allowing flammable gases and hot transformer oil to leak out and potentially ignite upon contact with oxygen, leading to an explosion. Effectively increasing the tank's mechanical strength enhances its overall explosion-proof capability and provides sufficient response time for the explosion-proof diaphragm and pressure relief valve.

[0003] The conventional converter transformer tank has a corner welded structure, including a tank top, a tank bottom, three side tank walls connecting the tank top and bottom, and a tank cover. One side of the unconnected side tank wall on the tank top has a tank edge, which is sealed with the tank cover. The side tank walls adopt a panel structure, and the inner wall of the side tank walls has an aluminum shielding structure to reduce leakage magnetic loss and reduce the temperature rise caused by leakage magnetic loss.

[0004] Oil tanks are typically constructed by welding thin-walled metal plates and reinforcing ribs. The tank has numerous welds, making weld strength and quality crucial to its overall strength. Corner welds, especially at edges and corners, are often fillet welds. Fillet welds, formed along the intersection of two perpendicular or nearly perpendicular weldments, have weak load-bearing capacity, and since corners are stress concentration points, they compromise the tank's structural strength. Due to the high voltage levels and large capacities of converter transformers, internal discharge faults can generate energy up to tens of megajoules, placing even greater demands on the tank's structural strength. Current technologies lack sufficient structural strength to withstand internal fault impacts, potentially leading to tank tearing and explosion, and ultimately, fire and explosion of the converter transformer. Summary of the Invention

[0005] In view of this, the present invention proposes a forged and welded composite forming converter transformer oil tank, which aims to solve the problem that the existing converter transformer oil tank structure is not strong enough to withstand the impact of internal discharge faults.

[0006] This invention proposes a forged and welded composite-formed converter transformer tank, comprising: two disc-shaped end face plates arranged opposite each other and spaced apart, wherein the connecting sides of the two disc-shaped end face plates extend between the two disc-shaped end face plates and are located on the connecting surface in the thickness direction of the disc-shaped end face plates; and two lower side bends, each disposed on the lower side between the two disc-shaped end face plates, wherein the two ends of the two lower side bends are respectively connected to the connecting sides of the two disc-shaped end face plates. The upper side is provided with two upper side curved plates, both of which are located on the upper side between the two disc-shaped end face panels. The two ends of the two upper side curved plates are respectively connected to the connecting side of the two disc-shaped end face panels. The two disc-shaped end face panels, the two lower side curved plates, and the two upper side curved plates form the overall bearing frame of the oil tank. The connecting side of the overall bearing frame of the oil tank extends to the connecting surface. The connecting side of the overall bearing frame of the oil tank is located at a predetermined distance from the corner of the overall bearing frame of the oil tank, which is used to transfer the bearing connection seam to a non-corner position.

[0007] Furthermore, in the aforementioned forged and welded composite-formed converter transformer tank, the overall supporting frame of the tank has fixing holes on the top surface, bottom surface, and two side surfaces, and the fixing holes on the top surface, bottom surface, and two side surfaces are respectively provided with a top panel, a bottom panel, and two side panels.

[0008] Furthermore, in the aforementioned forged and welded composite-formed converter transformer tank, the top panel, the bottom panel, and each of the side panels are provided with connecting stirrups at the load-bearing connection joints with the overall load-bearing frame of the tank. The two connecting sides of the connecting stirrups are respectively connected to two adjacent panels. The panels include: a top panel, a bottom panel, side panels, a disc-shaped end panel, a lower side bending plate, and an upper side bending plate.

[0009] Furthermore, in the aforementioned forged and welded composite-formed converter transformer tank, the connecting seam stirrup is a U-shaped structure. The U-shaped structure is inverted at the load-bearing connecting seam of two adjacent panels, and the load-bearing connecting seam of two adjacent panels is located at the middle position of the opening of the U-shaped structure.

[0010] Furthermore, in the aforementioned forged and welded composite-formed converter transformer tank, the connecting seam stirrups are manufactured by extrusion molding.

[0011] Furthermore, in the aforementioned forged and welded composite-formed converter transformer tank, the top panel, the bottom panel, and each of the side panels are all connected to the overall load-bearing frame of the tank by butt welding, so that the load-bearing connection seams of the top panel, the bottom panel, each of the side panels, and the overall load-bearing frame of the tank form a butt weld structure.

[0012] Furthermore, in the aforementioned forged and welded composite-formed converter transformer tank, each of the disc-shaped end face panels includes: a panel body; and a corner connector arranged along the thickness direction of the panel body, wherein the corner connector is arranged around the entire circumference of the edge of the panel body to extend to a connection surface perpendicular to the panel body, and the corner connector and the panel body form a disc-shaped structure.

[0013] Furthermore, in the aforementioned forged and welded composite-formed converter transformer tank, each of the lower side bends and / or each of the upper side bends is an L-shaped structure, used to be arranged at the transverse connecting corners, and extending the connecting side to the connecting surface where the connecting plate of the L-shaped structure is located.

[0014] Furthermore, in the aforementioned forged and welded composite-formed converter transformer tank, the connection between the wall panel body and the corner connector is provided with an arc transition body, which is used to extend the longitudinal and vertical connecting seams to the connecting surface where the corner connector is located through an arc transition; and / or, the connection between the two connecting plates of the L-shaped structure is provided with an arc transition section, which is used to extend the transverse connecting seam to the connecting surface where the connecting plate is located through an arc transition.

[0015] Furthermore, in the aforementioned forged and welded composite-formed converter transformer tank, each of the disc-shaped end face panels is manufactured by forging, and each of the lower side bending plates and each of the upper side bending plates is manufactured by extrusion molding.

[0016] The forged and welded composite-formed converter transformer tank provided by this invention forms an integral load-bearing frame through two disc-shaped end face plates, two lower side curved plates, and two upper side curved plates. The corners of this integral load-bearing frame are all integral structural components. Compared to the corner joints in existing technologies, the load-bearing joints are moved to non-corner locations, reducing stress concentration and avoiding the use of fillet welds at the corners, thus solving the problem of reduced load-bearing capacity caused by fillet welds. Simultaneously, the integral load-bearing frame includes all the tank's corners, making the edges and corners with poor stress conditions in the converter transformer tank a single unit, greatly strengthening the tank's structural strength and meeting the explosion-proof requirements of ultra-high voltage converter transformer equipment. Especially in the event of a large arc discharge inside the converter transformer, it can effectively defend against the impact of arc discharge energy, ensuring the tank does not tear and preventing internal faults from causing explosions and fires in the converter transformer. This solves the problem that existing converter transformer tanks lack sufficient structural strength to withstand the impact of internal discharge faults. In addition, this tank also has the following technical effects:

[0017] First, by forging the disc-shaped end face wall plate and extruding the lower and upper side bending plates, the corners of the entire box are integral structural components with rounded transitions, thus reducing stress concentration. The main load-bearing joints are all butt welds with strong load-bearing capacity, and the load-bearing capacity will not decrease due to corner welds.

[0018] Secondly, the extensive use of integral forging significantly reduces the total number of structural parts and welds, substantially lowering the strength reduction and product defect rate caused by weld quality issues. This reduction in welds also improves production efficiency and reduces labor intensity. Furthermore, the flange holes and reinforcing ribs on the upper part of the housing are directly forged into the structural parts, further reducing the number of parts and processing steps, thus significantly lowering processing costs during mass production.

[0019] Third, structural parts with angled requirements, such as the lower side panel, are formed by one-time extrusion molding, ensuring that the angle is strictly guaranteed. This avoids dimensional misalignment caused by welding and splicing angles and improves the dimensional stability of the box. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of a converter transformer oil tank formed by forging and welding according to an embodiment of the present invention;

[0022] Figure 2 This is another structural schematic diagram of a converter transformer oil tank formed by forging and welding according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the overall load-bearing frame of the fuel tank provided in an embodiment of the present invention;

[0024] Figure 4 This is a structural schematic diagram of the weld position of the forged and welded composite-formed converter transformer tank provided in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the left end wall panel provided in an embodiment of the present invention;

[0026] Explanation of reference numerals in the attached figures:

[0027] 10-Integral load-bearing frame of fuel tank, 1-Disc-shaped end face wall panel, 101-Left end face wall panel, 102-Right end face wall panel, 11-Wall panel body, 12-Corner connector, 13-Circular transition body, 2-Lower side curved plate, 21-Lower side curved plate body, 22-Extension connecting plate, 3-Upper side curved plate, 4-Bottom panel, 5-Top panel, 6-Side panel, 7-Bottom plate, 8-Connecting seam stirrup. Detailed Implementation

[0028] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] See Figures 1 to 5 This is a schematic diagram of the structure of a forged and welded composite-formed converter transformer tank provided in an embodiment of the present invention. As shown in the figure, the tank includes: two disc-shaped end face plates 1, two lower side curved plates 2, two upper side curved plates 3, a bottom panel 4, a top panel 5, two side panels 6, and a bottom plate 7; wherein,

[0030] Both disc-shaped end face panels 1 have a disc-shaped structure. The two disc-shaped end face panels 1 are arranged opposite each other and spaced apart. Furthermore, the connecting sides of both disc-shaped end face panels 1 extend between them and are located on the connecting surface in the thickness direction of the disc-shaped end face panels 1. Specifically, the two disc-shaped end face panels 1 can be a left end face panel 101 and a right end face panel 102. Both the left end face panel 101 and the right end face panel 102 have a disc-shaped structure, meaning that the four sides of the left end face panel 101 and the right end face panel 102 extend a certain distance towards other surfaces of the housing, such that the connecting sides of the left end face panel 101 and the right end face panel 102 extend to the connecting surface in the thickness direction of the disc-shaped end face panel 1. This connecting surface is perpendicular to the left end face panel 101 and the right end face panel 102. In other words, as shown... Figure 2 The top surface, bottom surface, or two side surfaces shown (relative to) Figure 2The left and right side panels shown are actually considered front and rear sides relative to the left end panel 101 and right end panel 102 during actual installation. The left end panel 101 and right end panel 102 are arranged opposite each other and spaced apart, meaning that the extended surface is located between the left end panel 101 and right end panel 102, which can transfer the connection seams between the left end panel 101 and right end panel 102 and other components to a non-corner position of the fuel tank. In this embodiment, both the left end panel 101 and the right end panel 102 are manufactured by forging, i.e., pressing, to maximize the use of integral processing, making the corners and edges integral structural components. This allows for the formation of the converter tank through component processing. Furthermore, the reinforcing ribs on the disc-shaped end panel 1 are integrally formed onto the surface of the disc-shaped end panel 1, increasing strength while reducing material consumption and simplifying the process. Simultaneously, the integral processing of the left end panel 101 and the right end panel 102 significantly reduces the total number of structural parts in the tank, reducing the number of welds and substantially decreasing the strength reduction and product defect rate caused by weld quality. The reduction in welds also improves production efficiency and reduces labor intensity. Forging is a forming method where solid metal undergoes plastic flow under external force, and through this plastic deformation, a blank or part with a certain geometric shape, size, and performance is obtained. Currently, processing can be divided into forging and stamping methods depending on the processing temperature.

[0031] Both lower curved plates 2 are located on the lower side between the two disc-shaped end face plates 1 (relative to) Figure 1 and Figure 2 (as shown in the position), and, at both ends of the two lower side bends 2 (as shown in the position). Figure 1The lower left and upper right ends (as shown) are respectively connected to the connecting sides of the two disc-shaped end face panels 1. Specifically, the lower side curved plate 2 can be an L-shaped structure, used to transfer the connection seam between the side and the bottom surface to the side and the bottom surface, with a gap from the corner position, i.e., at the non-corner position. The two lower side curved plates 2 are arranged one after the other, and one end of each lower side curved plate 2 can be connected to the left end face panel 101 by butt welding, and the other end can be connected to the right end face panel 102 by butt welding. In this embodiment, the width of the bottom panel 4 in the front-to-back direction is less than the distance between the two side panels 6. The bottom corners of the left end panel 101 and the right end panel 102 are chamfered. To improve the structural strength of the oil tank, it is preferable to have an inclined angle, especially the lower side curved plate 2, which may include: a lower side curved plate body 21. The lower side curved plate body 21 serves as a bearing plate for the inclined surface. Both long sides of the lower side curved plate body 21 are provided with extension connecting plates 22 arranged at an angle to the lower side curved plate body 21, extending to the side and bottom surfaces respectively, to transfer the connection seams between the lower side curved plate body 21 and the side panels 6 and the bottom panel 4 to non-corner positions on the side and bottom surfaces respectively. The extension connecting plates 22 and the lower side curved plate body 21 are set at an obtuse angle. In this embodiment, each extension connecting plate 22 and the lower side curved plate body 21 are provided with an arc transition section, so that the corners are transferred through an arc transition, avoiding stress concentration at the corners. The lower side curved plate 2 can be made by bending, which is a type of extrusion molding process. In particular, the lower side curved plate 2 is extruded in one go, ensuring that the angle is strictly guaranteed, avoiding dimensional misalignment caused by welding and splicing angles, and improving the dimensional stability of the box.

[0032] Two upper side bends 3 are both disposed on the upper side between two disc-shaped end face panels 1, and the two ends of the two upper side bends 3 are respectively connected to the connecting sides of the two disc-shaped end face panels 1. The two disc-shaped end face panels 1, the two lower side bends 2, and the two upper side bends 3 form the overall bearing frame 10 of the oil tank. The connecting sides of the overall bearing frame 10 of the oil tank extend to the connecting surface, especially through an arc. Furthermore, at a predetermined distance between the connecting sides of the overall bearing frame 10 of the oil tank and the corners of the overall bearing frame 10 of the oil tank, the bearing connection seam is moved outward to a non-corner position. Specifically, the upper side bends 3 can be L-shaped structures, used to transfer the connection seam between the side and the bottom surface to the side and the bottom surface with a distance from the corner position, i.e., a non-corner position. The two upper side bends 3 are arranged front and rear. One end of each upper side bend 32 can be connected to the left end face panel 101 by butt welding, and the other end can be connected to the right end face panel 102 by butt welding. In this embodiment, the two upper side curved plate bodies 31 of the upper side curved plate 3 are vertically arranged. In this embodiment, an arc transition section is provided between the two upper side curved plates 32 so that the corners can be transferred by arc transition, avoiding stress concentration at the corners. The upper side curved plate 3 can be manufactured by extrusion molding. In particular, the upper side curved plate 3 is extruded in one piece, and the angle is strictly guaranteed, avoiding dimensional misalignment caused by welding splicing angle, and improving the dimensional stability of the tank. The two disc-shaped end wall panels 1, the two lower side curved plates 2, and the two upper side curved plates 3 form the overall bearing frame 10 of the oil tank. Due to the disc-shaped structure of the disc-shaped end wall panels 1 and the arrangement of the lower side curved plates 2 and upper side curved plates 3, all the corners of the oil tank are set on the overall bearing frame 10 of the oil tank. That is, the overall bearing frame 10 of the oil tank includes all the corners of the tank, and the corner positions are all integral structural components. At the same time, the bearing connection seam is moved to the non-corner position.

[0033] In this embodiment, the overall support frame 10 of the fuel tank has fixing holes on the top surface, bottom surface, and two side surfaces. That is, the two disc-shaped end wall panels 1, the two lower side curved plates 2, and the two upper side curved plates 3 form four fixing holes. The fixing holes on the top surface, bottom surface, and two side surfaces are respectively provided with a bottom panel 4, a top panel 5, and two side panels 6. The bottom panel 4, the top panel 5, and the two side panels 6 can be butt-welded to the overall support frame 10 of the fuel tank. The bottom panel 4 is a flat steel plate, butt-welded to the plane enclosed by the left end panel 101, the lower side curved plate 2, and the right end panel 10. The top panel 5 is flat, butt-welded to the plane enclosed by the left end panel 101, the upper side curved plate 3, and the right end panel 10. The side panels 6 are long panels, such as rectangular steel plates, with multiple reinforcing ribs. The reinforcing ribs are extruded onto the steel plate and can be one or more pieces joined together, butt-welded to the plane enclosed by the left end panel 101, the lower side curved plate 2, the upper side curved plate 3, and the right end panel 102. The bottom plate 7 is then welded to the bottom panel 4, and other auxiliary reinforcing ribs are welded on top. All butt welds have connecting stirrups 8 on their outer sides, which are integrally extruded U-shaped strips.

[0034] To further improve the structural strength of the fuel tank body, preferably, the bottom panel 4, top panel 5, and two side panels 6 are all connected to the overall load-bearing frame 10 of the fuel tank by butt welding, so that the load-bearing connection seams of the bottom panel 4, top panel 5, and two side panels 6 and the overall load-bearing frame 10 of the fuel tank form a butt weld structure; wherein, the butt weld is a weld welded between the bevel faces of the welded parts or between the bevel face of one welded part and the end face of another welded part, and its load-bearing capacity is strong.

[0035] To further improve the connection strength of the load-bearing joints, preferably, connecting stirrups 8 are provided at the load-bearing joints of the bottom panel 4, top panel 5, and two side panels 6 with the overall load-bearing frame 10 of the fuel tank. The two connecting sides of the connecting stirrups 8 are respectively connected to two adjacent different panels; wherein, the panels are the bottom panel 4, top panel 5, side panels 6, disc-shaped end wall panel 1, lower side curved plate 2, or upper side curved plate 3. Specifically, the connecting stirrups 8 can be U-shaped structures, with the U-shaped structure inverted at the load-bearing joint of two adjacent panels, and the load-bearing joint of the two adjacent panels is located at the middle position of the opening of the U-shaped structure, with a cavity formed between the U-shaped structure and the two adjacent panels. The setting of the connecting stirrups 8 makes the connection strength of the load-bearing joint higher than the strength of the body material, further strengthening the structural strength of the box. In this embodiment, the connecting stirrups 8 are made by extrusion molding.

[0036] See also Figure 5Each disc-shaped end face wall panel 1 includes: a wall panel body 11 and a corner connector 12 arranged along the thickness direction of the wall panel body 11; wherein, the corner connector 12 is arranged around the edge of the wall panel body 11 to extend to the connection surface perpendicular to the wall panel body 11, and the corner connector 12 and the wall panel body 11 form a disc-shaped structure.

[0037] Specifically, the wall panel body 11 can be a plate-like structure. The corner connector 12 can be a hollow cylindrical structure. The end side of the corner connector 12 is connected to the outer edge of the wall panel body 11, and an arc transition body 13 can be provided between the two to extend the longitudinal and vertical connecting seams to the connecting surface where the corner connector 12 is located through the arc transition. That is, the vertical connecting seam extends to the side, and the longitudinal connecting seam extends to the top or bottom surface. The wall panel body 11, the corner connector 12, and the arc transition body 13 can be an integral structure, especially, they can be integrally manufactured by forging. The corner connector 12 is set as a corner and can extend a certain distance to other surfaces of the box, so that the disc-shaped end wall panel 1 forms a basin-shaped structure.

[0038] In this embodiment, the disc-shaped end panel 1, the lower side curved plate 2, the two upper side curved plates 3, the bottom panel 4, the top panel 5, and the two side panels 6 are provided with reinforcing ribs and / or holes. The shell between the reinforcing ribs or holes and the panels is formed by an integral molding process. That is to say, as Figure 5 As shown, the left end panel 101, especially the panel body 11 of the left end panel 101, is provided with reinforcing ribs and elliptical holes. The reinforcing ribs, holes, panel body 11, corner connector 12, and arc transition body 13 are all integrally forged, meaning the reinforcing ribs and holes are formed simultaneously on the part. The right end panel 102, especially the panel body 11 of the right end panel 102, is provided with reinforcing ribs. The reinforcing ribs, panel body 11, corner connector 12, and arc transition body 13 are all integrally forged, meaning the reinforcing ribs are formed simultaneously on the part. The top panel 5 has multiple holes and a flange connection structure for pre-welding other equipment can be pre-welded onto it.

[0039] In summary, the forged and welded composite-formed converter transformer tank provided in this embodiment forms an integral load-bearing frame 10 through two disc-shaped end face plates 1, two lower side curved plates 2, and two upper side curved plates 3. The corners of the integral load-bearing frame 10 are all integral structural components. Compared to the corner joints in existing technologies, the load-bearing joints are moved to non-corner locations, reducing stress concentration and avoiding the use of fillet welds at the corners, thus solving the problem of reduced load-bearing capacity caused by fillet welds. Simultaneously, the integral load-bearing frame 10 includes all the tank's corners, making the edges and corners with poor stress conditions in the converter transformer tank a single unit, greatly strengthening the tank's structural strength and meeting the explosion-proof requirements of UHV converter transformer equipment. Especially in the event of a large arc discharge inside the converter transformer, it can effectively defend against the impact of arc discharge energy, ensuring the tank does not tear and preventing internal faults from causing the converter transformer to explode and catch fire. This solves the problem that existing converter transformer tanks lack sufficient structural strength to withstand the impact of internal discharge faults. In addition, the fuel tank also has the following technical advantages:

[0040] First, by forging the disc-shaped end face wall plate and extruding the lower and upper side bending plates, the corners of the entire box are integral structural components with rounded transitions, thus reducing stress concentration. The main load-bearing joints are all butt welds with strong load-bearing capacity, and the load-bearing capacity will not decrease due to corner welds.

[0041] Secondly, the extensive use of integral forging significantly reduces the total number of structural parts and welds, substantially lowering the strength reduction and product defect rate caused by weld quality issues. This reduction in welds also improves production efficiency and reduces labor intensity. Furthermore, the flange holes and reinforcing ribs on the upper part of the housing are directly forged into the structural parts, further reducing the number of parts and processing steps, thus significantly lowering processing costs during mass production.

[0042] Third, structural parts with angled requirements, such as the lower side panel, are formed by one-time extrusion molding, ensuring that the angle is strictly guaranteed. This avoids dimensional misalignment caused by welding and splicing angles and improves the dimensional stability of the box.

[0043] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0044] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A converter transformer oil tank formed by forging and welding, characterized in that, include: Two disc-shaped end face panels with a disc-shaped structure are arranged opposite each other and spaced apart. The connecting side of the two disc-shaped end face panels extends between the two disc-shaped end face panels and is located on the connecting surface in the thickness direction of the disc-shaped end face panels. Both lower side curved plates are set on the lower side between the two disc-shaped end face panels, and the two ends of the two lower side curved plates are respectively connected to the connecting side of the two disc-shaped end face panels; Two upper side curved plates are both set on the upper side between two disc-shaped end face panels. The two ends of the two upper side curved plates are respectively connected to the connecting side of the two disc-shaped end face panels. The two disc-shaped end face panels, the two lower side curved plates, and the two upper side curved plates form the overall load-bearing frame of the oil tank. The connecting side of the overall load-bearing frame of the oil tank extends to the connecting surface. At a position where the connecting side of the overall load-bearing frame of the oil tank has a preset distance from the corner of the overall load-bearing frame of the oil tank, the load-bearing connection seam is used to transfer to a non-corner position. Each of the aforementioned disc-shaped end face panels includes: siding body; A corner connector is arranged along the thickness direction of the wall panel body. The corner connector is set around the entire circumference of the edge of the wall panel body to extend to the connection surface perpendicular to the wall panel body. The corner connector and the wall panel body form a disc-shaped structure. Each of the lower side bending plates and / or each of the upper side bending plates is an L-shaped structure, used to be arranged at the transverse connecting corners, and extending the connecting side to the connecting surface where the L-shaped connecting plate is located; The connection between the wall panel body and the corner connector is provided with an arc transition body, which extends the longitudinal and vertical connecting seams to the connecting surface where the corner connector is located through an arc transition; and / or, The connection between the two connecting plates of the L-shaped structure is provided with an arc transition section, which is used to extend the transverse connecting seam to the connecting surface where the connecting plate is located through an arc transition.

2. The forged and welded composite-formed converter transformer tank according to claim 1, characterized in that, The overall support frame of the oil tank has fixing holes on the top surface, bottom surface and two side surfaces, and the fixing holes on the top surface, bottom surface and two side surfaces are respectively provided with a top panel, a bottom panel and two side panels.

3. The forged and welded composite-formed converter transformer tank according to claim 2, characterized in that, The top panel, bottom panel, and each side panel are provided with connecting stirrups at the load-bearing connection joints of the overall load-bearing frame of the oil tank. The two connecting sides of the connecting stirrups are respectively connected to two adjacent panels. The panels include: top panel, bottom panel, side panel, disc-shaped end panel, lower side bending plate, and upper side bending plate.

4. The forged and welded composite-formed converter transformer tank according to claim 3, characterized in that, The connecting stirrups are U-shaped structures, which are inverted at the load-bearing connecting joints of two adjacent panels, and the load-bearing connecting joints of the two adjacent panels are located at the middle position of the opening of the U-shaped structure.

5. The forged and welded composite-formed converter transformer tank according to claim 3, characterized in that, The connecting seam stirrups are manufactured by extrusion molding.

6. The forged and welded composite-formed converter transformer tank according to claim 2, characterized in that, The top panel, bottom panel, and each side panel are all connected to the overall load-bearing frame of the fuel tank by butt welding, so that the load-bearing connection seams of the top panel, bottom panel, each side panel and the overall load-bearing frame of the fuel tank form a butt weld structure.

7. The forged and welded composite-formed converter transformer tank according to any one of claims 1 to 6, characterized in that, Each of the disc-shaped end face panels is made by forging, and each of the lower side bends and each of the upper side bends is made by extrusion molding.

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