An explosion-proof oil tank device for oil-immersed transformer and a manufacturing method thereof

Abstract

The application discloses an oil-immersed transformer anti-explosion oil tank device and a manufacturing method. The oil-immersed transformer anti-explosion oil tank device is formed by splicing multiple side walls to form a tank body structure. The multiple side walls are connected by using a connecting plate at the bottom closing connection. The device is used to reduce the stress concentration area of the tank body, thereby improving the arc fault tolerance of the oil-immersed power equipment oil tank. Compared with the existing oil-immersed power equipment oil tank, the bottom closing of the oil tank is simplified, the stress concentration is reduced by using a circular arc transition, the arc fault tolerance of a higher energy level is achieved, and the oil-immersed power equipment can be more effectively protected to avoid various serious consequences caused by the rupture of the oil tank.

Description

Technical Field

[0001] This invention relates to the field of high-reliability container technology, and more specifically, to an explosion-proof oil tank device for an oil-immersed transformer and its manufacturing method. Background Technology

[0002] Currently, in the manufacturing process of oil-immersed large transformer tanks, the steel plate welding method is mostly adopted, and its structure is as follows: Figure 1 As shown, existing transformer tank structures often use T-joint welding at the side plate connection 1, resulting in significant stress concentration. Furthermore, welding is frequently used at the side wall taper area 2. When applied to large ultra-high voltage transformer tanks, taper treatment is difficult, and the taper connection at the bottom of the tank 3 often uses cross-welds, posing a serious safety hazard. Under pressure wave impact from within the tank, tearing and other risks are possible. To facilitate transportation, a reasonable taper design is needed for the bottom of large transformer tanks. Stress concentration occurs in the corner weld area and bottom taper connection area of ​​the transformer tank. Oil-immersed transformers achieve insulation requirements through insulating oil; however, once an insulation fault develops into an arc discharge in the oil, the insulating oil rapidly vaporizes, decomposes, and generates a large amount of high-temperature, high-pressure oil gas, pulsating and triggering pressure waves. As the pressure waves propagate and reflect within the tank, the internal pressure surges, first damaging the stress concentration area and posing a serious safety hazard. Therefore, the structure of large power transformer tanks must be appropriately optimized, that is, the stress concentration areas of the tank should be dispersed, and the bottom of the tank should be reasonably designed to reduce the risk of transformer tank damage.

[0003] Therefore, there is a need for an explosion-proof oil tank device for immersed transformers with a rounded transition and a tapered bottom. Summary of the Invention

[0004] This invention proposes an explosion-proof oil tank device and manufacturing method for oil-immersed transformers to solve the problem of how to make oil-immersed transformer oil tanks have better explosion-proof function.

[0005] To address the aforementioned problems, according to one aspect of the present invention, an explosion-proof oil tank device for an oil-immersed transformer is provided. The device is composed of multiple side walls spliced ​​together to form a box structure. The side walls are connected by an arc at the joints, and the lower ends of the side walls are connected by a connecting plate.

[0006] Preferably, the multiple sidewalls include: 2 long box walls, 2 short box walls and 4 arc-shaped steel plates. The long box walls and short box walls are connected by arc-shaped steel plates. The bottom of both the long box walls and short box walls are bent and tapered, and the sidewalls are integrally formed.

[0007] Preferably, the angle of the arc-shaped steel plate is 90°.

[0008] Preferably, the length of the straight edge reserved on both sides of the arc of the arc steel plate is greater than or equal to 100mm.

[0009] Preferably, the multiple sidewalls include: 2 long box walls and 2 short box walls. The short box walls have a notch at the bottom. The short box walls are bent and then connected to the long box walls. The notch is connected by a connecting plate. The bottom of the long box walls is bent and closed.

[0010] Preferably, the bending area of ​​the short box wall is a 90° arc, and the length of the straight edge reserved on both sides of the arc is greater than or equal to 100mm.

[0011] According to another aspect of the present invention, a method for manufacturing an explosion-proof oil tank device for an oil-immersed transformer is provided, the method comprising: The lower closing area of ​​the long and short box walls is bent inward to obtain the box wall to be welded; Cut a steel plate at the same height as the upper end of the closing area and bend it to obtain an arc-shaped steel plate; The two sides of the arc-shaped steel plate are butt-welded to the short box wall and the long box wall respectively to obtain the preliminary box structure; Measure the bottom notch of the preliminary box structure and process a connecting plate of the corresponding size; The connecting plate is butt-welded to the wall of the tank to be welded to obtain an explosion-proof oil tank device for an oil-immersed transformer.

[0012] Preferably, a preset length is reserved on both sides of the arc-shaped steel plate, and the preset length is greater than or equal to 100mm.

[0013] Preferably, the angle of the arc-shaped steel plate is 90°.

[0014] According to another aspect of the present invention, a method for manufacturing an explosion-proof oil tank device for an oil-immersed transformer is provided, the method comprising: The lower end of the long box wall is bent inward to form the box wall to be welded. Cut the joints at the ends of the short and long box walls; The steel plate above the notch in the short box wall is bent using a bending machine to form a 90° arc; The short box wall and the long box wall are butt-welded together using an arc to obtain the preliminary box structure; Measure the notch at the bottom of the welded box and process a connecting plate of the corresponding size; The connecting plate is butt-welded to the wall of the tank to be welded to obtain an explosion-proof oil tank device for an oil-immersed transformer.

[0015] This invention provides an explosion-proof oil tank device and manufacturing method for oil-immersed transformers. The explosion-proof oil tank device of this invention is composed of multiple sidewalls spliced ​​together to form a tank structure. The sidewalls are connected by a rounded transition at the joints, and the lower ends of the sidewalls are connected by connecting plates. This device reduces stress concentration areas in the tank body, thereby improving the arc fault tolerance of oil-immersed power equipment tanks. Compared to existing oil-immersed power equipment tanks, this invention simplifies the bottom end design while using a rounded transition to reduce stress concentration, providing higher energy level arc fault tolerance and more effectively protecting oil-immersed power equipment, avoiding various serious consequences caused by tank rupture. Attached Figure Description

[0016] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures: Figure 1 A schematic diagram of the structure of an existing oil-immersed transformer tank assembly; Figure 2 This is a schematic diagram of the explosion-proof oil tank device for an oil-immersed transformer with constricted openings on both sides according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the structure of an explosion-proof oil tank device for a single-sided oil-immersed transformer according to an embodiment of the present invention. Figure 4 A flowchart of a method 400 for manufacturing an explosion-proof oil tank device for an oil-immersed transformer with closed ends according to an embodiment of the present invention. Figure 5 This is a flowchart of a method 500 for manufacturing an explosion-proof oil tank device for a single-sided closed oil-immersed transformer according to an embodiment of the present invention. Detailed Implementation

[0017] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0018] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0019] This invention provides an explosion-proof oil tank device for oil-immersed transformers. Compared with existing oil-immersed power equipment oil tanks, it simplifies the bottom opening of the oil tank while using a rounded transition to reduce stress concentration. It has a higher energy level of arc fault tolerance and can more effectively protect oil-immersed power equipment, avoiding various serious consequences caused by oil tank rupture.

[0020] The oil-immersed transformer explosion-proof tank device provided in this invention is composed of multiple side walls spliced ​​together to form a box structure. The multiple side walls are connected by an arc at the joint of the wall panels, and the lower joint of the multiple side walls is connected by a connecting plate.

[0021] Preferably, the multiple sidewalls include: 2 long box walls, 2 short box walls and 4 arc-shaped steel plates. The long box walls and short box walls are connected by arc-shaped steel plates. The bottom of both the long box walls and short box walls are bent and tapered, and the sidewalls are integrally formed.

[0022] Preferably, the angle of the arc-shaped steel plate is 90°.

[0023] Preferably, the length of the straight edge reserved on both sides of the arc of the arc steel plate is greater than or equal to 100mm.

[0024] Figure 2 This is a schematic diagram of the explosion-proof oil tank device for an oil-immersed transformer with constricted openings on both sides according to an embodiment of the present invention. Figure 2 The image shows a fuel tank assembly with tapered ends on both sides, where a 90° arc steel plate was machined using a bending machine. And leave a straight edge of no less than 100 mm on both sides of the arc to close the lower part of the side wall of the fuel tank. The tank sidewalls are bent using a bending machine, and the edges are not welded, resulting in a single, integrally formed sidewall. The sidewalls are then joined to a 90° arc-shaped steel plate. Butt welding; a connecting plate is used at the joint of the lower tank wall. The butt welding reduces the welding area compared to the original tank structure and makes it easier to close the joint. The rounded transition of the tank side wall connection can effectively reduce stress concentration.

[0025] Preferably, the multiple sidewalls include: 2 long box walls and 2 short box walls. The short box walls have a notch at the bottom. The short box walls are bent and then connected to the long box walls. The notch is connected by a connecting plate. The bottom of the long box walls is bent and closed.

[0026] Preferably, the bending area of ​​the short box wall is a 90° arc, and the length of the straight edge reserved on both sides of the arc is greater than or equal to 100mm.

[0027] Figure 3This is a schematic diagram of the structure of a single-sided tapered oil-immersed transformer explosion-proof tank device according to an embodiment of the present invention. Figure 3 The image shows a fuel tank assembly with a single-sided constriction, wherein the short tank wall above the fuel tank... After cutting, a bending machine is used to bend the joint with the long tank wall, leaving a straight edge of no less than 100 mm at the arc and joint. The lower end is finished by bending inwards using a bending machine to reduce welding steps. The long and short tank walls are then butt-welded together. A connecting plate is used at the joint of the lower tank wall. Butt welding eliminates the need for cross welds and simplifies the welding process, effectively reducing stress concentration.

[0028] Figure 4 This is a flowchart of a method 400 for manufacturing an explosion-proof oil tank device for an oil-immersed transformer with constricted ends according to an embodiment of the present invention. Figure 4 As shown, the manufacturing method 400 of the oil-immersed transformer explosion-proof oil tank device provided by the embodiment of the present invention includes: Step 401: Bend the lower end of the long and short box walls inward to obtain the box wall to be welded. Step 402: Cut a steel plate at the same height as the upper end of the closing area and bend it to obtain an arc-shaped steel plate; Step 403: Butt weld the two sides of the arc steel plate to the short box wall and the long box wall respectively to obtain the preliminary box structure; Step 404: Measure the bottom notch of the preliminary box structure and process a connecting plate of the corresponding size; Step 405: Butt weld the connecting plate to the wall of the tank to be welded to obtain the explosion-proof oil tank device for the oil-immersed transformer.

[0029] Preferably, a preset length is reserved on both sides of the arc-shaped steel plate, and the preset length is greater than or equal to 100mm.

[0030] Preferably, the angle of the arc-shaped steel plate is 90°.

[0031] This invention relates to an explosion-proof oil tank for a large oil-immersed transformer, featuring an optimized rounded transition and bottom taper, with taper treatment applied to all side walls (tank structure as shown). Figure 2 (As shown). Its production process includes the following steps: Step 1: Use a bending machine to bend the lower end of the long and short box walls inward to obtain the box wall to be welded.

[0032] Step 2: Cut a steel plate at the same height as the top of the end, and bend it using a bending machine to obtain a 90° arc-shaped steel plate.

[0033] Step 3: Butt weld the two sides of the arc-shaped steel plate to the short box wall and the long box wall to obtain the preliminary box structure.

[0034] Step 4: Measure the notch at the bottom of the welded box and process a connecting plate of the corresponding size.

[0035] Step 5: Butt weld the connecting plate to the box wall to obtain the overall box structure.

[0036] Preferably, in the bending process described in step 1, reasonable inward parameters should be formulated according to actual transportation requirements.

[0037] Preferably, the arc-shaped steel plate described in step 2 should have its arc length calculated according to the actual working conditions, and a certain length should be reserved on both sides to facilitate welding with the side walls.

[0038] Preferably, when performing butt welding, reasonable welding process parameters should be selected according to the working conditions.

[0039] Preferably, hot working processes should be avoided as much as possible when manufacturing the connecting plate, as they can cause changes in the microstructure and affect the quality of subsequent welding.

[0040] More preferably, the connecting plate should have a rounded transition.

[0041] More preferably, bending and cutting processes should be used as much as possible when manufacturing connecting plates.

[0042] Figure 5 This is a flowchart of a method 500 for manufacturing a single-sided closed-end oil-immersed transformer explosion-proof tank device according to an embodiment of the present invention. Figure 5 As shown, the manufacturing method 500 of the oil-immersed transformer explosion-proof oil tank device provided by the embodiment of the present invention includes: Step 501: Bend the lower end of the long box wall inward to form the box wall to be welded. Step 502: Cut the openings of the short and long box walls. Step 503: Use a bending machine to bend the steel plate above the short box wall notch to form a 90° arc; Step 504: Butt weld the short box wall and the long box wall together using an arc to obtain the preliminary box structure; Step 505: Measure the notch at the bottom of the welded box and process a connecting plate of the corresponding size; Step 506: Butt weld the connecting plate to the wall of the tank to be welded to obtain the explosion-proof oil tank device for the oil-immersed transformer.

[0043] This invention relates to an explosion-proof oil tank for a large oil-immersed transformer that employs a rounded transition and bottom taper optimization, with only the long tank wall being tapered (tank structure as shown). Figure 3 (As shown). Its production process includes the following steps: Step 1: Use a bending machine to bend the lower end of the long box wall inward to obtain the long box wall to be welded.

[0044] Step 2: Cut the joints of the short and long box walls.

[0045] Step 3: Use a bending machine to bend the steel plate above the notch in the short box wall to form a 90° arc.

[0046] Step 4: Butt weld the short box wall and the long box wall together using an arc to obtain the preliminary box structure.

[0047] Step 5: Measure the notch at the bottom of the welded box and process a connecting plate of the corresponding size.

[0048] Step 6: Butt weld the connecting plate to the box wall to obtain the overall box structure.

[0049] Preferably, in the bending process described in step 1, reasonable inward parameters should be formulated according to actual transportation requirements.

[0050] Preferably, in the cutting process described in step 2, the cutting should be designed reasonably according to the inward angle of the long box wall.

[0051] Preferably, in the bending process described in step 3, a straight edge of not less than 100 mm should be reserved at the junction of the arc and the long box wall for transition.

[0052] Preferably, when performing butt welding, reasonable welding process parameters should be selected according to the working conditions.

[0053] Preferably, hot working processes should be avoided as much as possible when manufacturing the connecting plate, as they can cause changes in the microstructure and affect the quality of subsequent welding.

[0054] More preferably, the connecting plate should have a rounded transition.

[0055] More preferably, bending and cutting processes should be used as much as possible when manufacturing connecting plates.

[0056] This invention effectively disperses stress concentration areas by using an arc transition in the connection area of ​​the tank sidewall; it reduces welding processes by using a bending machine to close the lower end of the tank sidewall; and it uses a connecting plate to connect the lower end of the tank connection area, which not only disperses stress concentration but is also easy to apply to large transformer tanks, solving problems such as the difficulty of closing the end of large transformer tanks and greatly improving the overall explosion resistance of the tank.

[0057] The present invention has been described with reference to a few embodiments. However, it will be apparent to those skilled in the art that other embodiments besides those disclosed above fall equivalently within the scope of the present invention.

[0058] Generally, all terms used in this invention are interpreted according to their ordinary meaning in the art, unless otherwise expressly defined herein. All references to “a / the / the [device, component, etc.]” ​​are openly interpreted as at least one instance of said device, component, etc., unless otherwise expressly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed unless explicitly stated otherwise.

[0059] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0060] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0061] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0062] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0063] In the description of this invention, the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease 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.

[0064] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the present invention.

Claims

1. A device for an explosion-proof oil tank of an oil-immersed transformer, characterized in that, The device is assembled from multiple side walls to form a box structure. The side walls are connected by arcs at the joints, and the lower ends of the side walls are connected by connecting plates. The multiple sidewalls include: two long box walls and two short box walls. The short box walls have notches at the bottom. The short box walls are bent and then welded to the long box walls. The notches are welded together with connecting plates. The bottom of the long box walls is bent and closed.

2. The apparatus according to claim 1, characterized in that, The bending area of ​​the short box wall is a 90° arc, and the length of the straight edge reserved on both sides of the arc is greater than or equal to 100mm.

3. A method for manufacturing an explosion-proof oil tank device for an oil-immersed transformer as described in claim 2, characterized in that, The method includes: The lower end of the long box wall is bent inward to form the box wall to be welded. The short box walls were cut. The steel plate above the notch in the short box wall is bent using a bending machine to form a 90° arc; The short box wall and the long box wall are butt-welded together using an arc to obtain the preliminary box structure; Measure the notch at the bottom of the welded box and process a connecting plate of the corresponding size; The connecting plate is butt-welded to the wall of the tank to be welded to obtain an explosion-proof oil tank device for an oil-immersed transformer.

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