Oil tank structure for three-dimensional wound core transformer

Abstract

The utility model discloses an oil tank structure for a three-dimensional wound core transformer. The oil tank structure comprises an oil tank body and corrugated sheets fixedly arranged on the outer side wall of the oil tank body. The oil tank body comprises a tank bottom, side walls and a tank cover which are fixedly connected into a whole, and the side walls are formed by alternately enclosing a plurality of short side walls and a plurality of long side walls; the adjacent longitudinal edges of the short side wall and the long side wall are in lap joint to form a lap joint part; the lap joint part is spliced and aligned with the longitudinal side edge of the corrugated sheet, and is welded and fixed to form a longitudinal welding seam; the longitudinal welding seam is distributed along the longitudinal side edge of the corrugated sheet and the joint line of the lap joint part; and the transverse side edges of the corrugated sheets are welded and fixed on the short side walls or the long side walls to form transverse welding seams. According to the utility model, the number of welding seams is reduced, the welding workload is reduced, the production efficiency is improved, and the problems of poor overall structural strength and poor sealing performance of the oil tank caused by a large number of welding seams in the prior art are solved.

Description

Technical Field

[0001] This utility model belongs to the field of transformer technology, specifically relating to an oil tank structure for a three-dimensional wound core transformer. Background Technology

[0002] In the existing technology, most oil tanks of three-dimensional wound core transformers adopt a hexagonal main structure, such as three long side walls and three short side walls connected alternately. Compared with traditional triangular or circular oil tanks, this reduces the waste of apex space, improves the utilization rate of internal space, and reduces the amount of transformer oil used.

[0003] Currently, the long and short sidewalls used in the aforementioned fuel tanks are generally rectangular steel plates. Therefore, during fuel tank manufacturing, the longitudinal edges of the long and short sidewalls must first be aligned and welded together. Then, corrugated fins for heat dissipation are welded onto each short and long sidewall. However, fuel tanks manufactured using this process often have the following problems:

[0004] Firstly, after the long sidewall and the short sidewall are welded and fixed, the weld seam is located at the joint angle, which easily leads to stress concentration, resulting in poor fatigue resistance and affecting the structural strength of the fuel tank.

[0005] Secondly, it requires additional welding of corrugated sheets to the short or long sidewalls, resulting in more weld seams in the final fuel tank, which affects the structural strength and sealing performance of the fuel tank.

[0006] In addition, due to limited welding space during actual production, robots cannot be used for automatic welding, resulting in a low level of automation. Utility Model Content

[0007] To address the aforementioned shortcomings in the existing technology, this utility model aims to provide a tank structure for a three-dimensional wound core transformer, thereby reducing the number of weld seams and optimizing the tank structure's strength and sealing performance.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A tank structure for a three-dimensional wound core transformer includes a tank body and corrugated sheets fixed to the outer side wall of the tank body; the tank body includes a tank bottom, side walls, and a tank cover fixedly connected as one piece, the side walls being formed by alternating short side walls and long side walls; the adjacent longitudinal edges of the short side walls and the long side walls overlap to form an overlapping portion; the overlapping portion is spliced ​​and aligned with the longitudinal side edge of the corrugated sheets and welded to form a longitudinal weld seam;

[0009] The longitudinal weld seams are distributed along the longitudinal side edge of the corrugated sheet and the joint line of the lap portion;

[0010] The transverse side edges of the corrugated sheet are welded and fixed to the short side wall or the long side wall to form a transverse weld seam.

[0011] As a limitation of this utility model, the width of the overlapping part is 10-15mm.

[0012] As a further limitation of this utility model, the shortest distance between the transverse side edge of the corrugated sheet and the edge of the surface on which it is located is 70-90mm, and the shortest distance between the longitudinal side edge of the corrugated sheet and the edge of the surface on which it is located is 70-90mm.

[0013] As another limitation of this utility model, the short sidewall and / or the long sidewall are U-shaped or L-shaped structures formed by bending, having a bent portion for overlapping.

[0014] As a further limitation of this utility model, the top and bottom of the corrugated sheet are both provided with reinforcing ribs, and the top reinforcing ribs and the bottom reinforcing ribs are arranged intersectingly.

[0015] As a third limitation of this utility model, the lid and the side wall are connected by an overlapping joint, and a sealing gasket is provided at the overlapping joint.

[0016] As a further limitation of this utility model, the short sidewall, the long sidewall, and the corrugated sheet all have welding bevels at the welding locations.

[0017] By adopting the above-mentioned technical solution, the beneficial effects achieved by this utility model compared with the prior art are as follows:

[0018] (1) This utility model adopts an integral bending forming process to process the short sidewall and / or long sidewall into a U-shaped or L-shaped structure with a bending part, so that the longitudinal edges of the long sidewall and the short sidewall can overlap together and can be welded together with the longitudinal side edge of the corrugated sheet after being spliced ​​and aligned. On the one hand, the longitudinal weld seam formed is offset from the corner seam of the tank sidewall, which solves the problem of poor fatigue resistance at the corner seam of the tank sidewall caused by the weld seam in the existing structure; on the other hand, it is not necessary to weld and fix the corrugated sheet separately, which reduces the number of weld seams, reduces the welding workload, and improves production efficiency. At the same time, it solves the problem of poor overall structural strength and poor sealing performance of the tank caused by the large number of weld seams in the existing technology.

[0019] (2) This utility model optimizes the welding space by rationally designing the oil tank structure (the shortest distance between the edge of the corrugated sheet and the edge of the surface it is located is adjusted to 70-90mm). At the same time, all parts used for welding are equipped with welding bevels, which facilitates the robot to perform welding operations and helps to improve welding quality and efficiency.

[0020] (3) The top and bottom of the corrugated sheet in this utility model are fixed with reinforcing ribs, and the short sidewalls and / or long sidewalls made by the overall bending forming process effectively improve the mechanical strength and deformation resistance of the oil tank.

[0021] (4) The tank cover and the side wall of this utility model are connected by an overlapping joint and are equipped with a sealing gasket, which improves the sealing performance of the tank. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0024] Figure 2 This is a structural schematic diagram from another angle of an embodiment of the present utility model;

[0025] Figure 3 This is a structural diagram of the box cover and side wall in a disassembled state in an embodiment of this utility model;

[0026] Figure 4 This is a schematic diagram of the structure in which the adjacent longitudinal edges of the short sidewall and the long sidewall overlap in an embodiment of the present invention (the short sidewall is U-shaped).

[0027] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;

[0028] Figure 6 This is a schematic diagram of the structure in which the adjacent longitudinal edges of the short sidewall and the long sidewall overlap in an embodiment of the present invention (the long sidewall is L-shaped).

[0029] In the diagram: 1. Fuel tank body; 2. Corrugated sheet; 3. Tank bottom; 4. Side wall; 5. Tank cover; 6. Long side wall; 7. Short side wall; 8. Bending section; 9. Reinforcing rib; 10. Tank edge. Detailed Implementation

[0030] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0031] This embodiment discloses a tank structure for a three-dimensional wound core transformer, such as... Figures 1 to 3 As shown, the tank includes a fuel tank body 1 and corrugated sheets 2 fixed to the outer side wall 4 of the fuel tank body 1. The fuel tank body 1 includes a tank bottom 3, side walls 4 and a tank cover 5. The tank bottom 3 and the tank cover 5 are fixedly connected to the bottom and top of the side wall 4, respectively. The side wall 4 is formed by alternating short side walls 7 and long side walls 6.

[0032] In this embodiment, the sidewall 4 is formed by three short sidewalls 7 and three long sidewalls 6 alternately enclosing an oil storage space with a hexagonal cross-section. The short sidewalls 7 and / or the long sidewalls 6 are U-shaped or L-shaped structures made of steel plates using an integral bending forming process. Specifically, a U-shaped structure refers to a steel plate with two opposite edges bent to one side, forming two mirror-symmetrical bends 8, with a bending angle typically of 120°; an L-shaped structure refers to a steel plate with only one edge bent to one side, forming a 120° bend 8.

[0033] Specifically, such as Figure 4 and Figure 5 As shown, in this embodiment, the short sidewall 7 has a U-shaped structure, and the long sidewall 6 is a conventional rectangular steel plate. During welding, the bent portion of the short sidewall 7 is first overlapped with the longitudinal edge of the long sidewall 6 to form an overlapping portion. The width of the overlapping portion is generally 10-15mm, and in this embodiment, the width of the overlapping portion is 13mm. Then, the overlapping portion is aligned with the longitudinal side edge of the corrugated sheet 2. Then, welding is performed to form a longitudinal weld seam. The longitudinal weld seam is distributed along the joint line between the longitudinal side edge of the corrugated sheet 2 and the overlapping portion, fixing the longitudinal edges (longitudinal side edges) of the short sidewall 7, long sidewall 6, and corrugated sheet 2 together. By analogy, all the longitudinal edges (longitudinal side edges) of the short sidewall 7, long sidewall 6, and corrugated sheet 2 are welded and fixed together to form the sidewall 4 of the fuel tank body 1, and at the same time, the corrugated sheet 2 is fixed on the sidewall 4.

[0034] Of course, depending on the circumstances, the short sidewall 7 and / or the long sidewall 6 can also be processed into an L-shaped structure. For example... Figure 6 As shown, the short sidewall 7 is a rectangular steel plate, and the long sidewall 6 is an L-shaped structure. Similarly, during welding, the bent part of the long sidewall 6 is first overlapped with the longitudinal edge of the short sidewall 7 to form an overlapping joint; then the overlapping joint is aligned with the longitudinal side edge of the corrugated sheet 2; and then welding is performed to form a longitudinal weld seam.

[0035] Furthermore, a corrugated sheet 2 is fixedly installed on all short sidewalls 7 and all long sidewalls 6 of the tank body 1. The corrugated sheet 2 is a conventional structure used for heat dissipation in transformer tanks. In this embodiment, reinforcing ribs 9 are welded and fixed to the top and bottom of each corrugated sheet 2, such as... Figure 1 and Figure 2 As shown, the top reinforcing ribs 9 and bottom reinforcing ribs 9 are arranged in a cross pattern, which improves the mechanical strength and deformation resistance of the fuel tank. In addition, in this embodiment, the lateral edge of each corrugated sheet 2 is fixed to the corresponding short sidewall 7 or long sidewall 6 by welding, forming a lateral weld seam. The lateral weld seam and the aforementioned longitudinal weld seam surround the corrugated sheet 2, allowing the corrugated sheet 2 to be securely fixed to the sidewall 4 of the fuel tank body 1.

[0036] It should be noted that, depending on the actual situation, corrugated sheets 2 may also be fixed only on all the long sidewalls 6 of the tank body 1.

[0037] Furthermore, both the tank bottom 3 and the tank cover 5 are hexagonal shapes adapted to the cross-sectional shape of the side wall 4. In this embodiment, both the tank bottom 3 and the tank cover 5 adopt existing structures. The tank bottom 3 is welded and fixed to the bottom of the side wall 4. The tank cover 5 is overlapped and connected to the top of the side wall 4, and a sealing gasket is provided at the overlap to ensure the sealing performance of the tank. Specifically, as shown... Figure 3 As shown, the top of the side wall 4 extends outward to form a box edge 10, and multiple spaced fixing holes are provided on the box edge 10; multiple mounting holes are provided on the edge of the box cover 5, and the number of mounting holes and fixing holes are the same and their positions correspond one-to-one; the box cover 5 is overlapped on the box edge 10, and the mounting holes are aligned with the fixing holes, and then bolts are inserted to tighten it.

[0038] To facilitate robotic welding, this embodiment optimizes the welding space by adjusting the shortest distance between the edge of the corrugated sheet 2 and the edge of its surrounding surface to 70-90 mm; in this embodiment, the distance is 90 mm. That is, the distance between the transverse weld seam and the edge of its surrounding surface is approximately 90 mm; the distance between the longitudinal weld seam and the edge of its surrounding surface is also approximately 90 mm. Furthermore, this embodiment incorporates a welding bevel design for all welding components, including the short sidewall 7, the long sidewall 6, and the corrugated sheet 2.

[0039] It should be noted that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An oil tank structure for a three-dimensional wound core transformer, comprising an oil tank body and corrugated sheets fixed on the outer sidewall of the oil tank body; the oil tank body comprises an integrated tank bottom, sidewall and tank cover, and the sidewall is enclosed by a plurality of short sidewalls and a plurality of long sidewalls alternately; characterized in that: The short sidewall and the long sidewall overlap at their adjacent longitudinal edges to form an overlap portion; the overlap portion is spliced ​​and aligned with the longitudinal side edge of the corrugated sheet and welded to form a longitudinal weld seam. The longitudinal weld seams are distributed along the longitudinal side edge of the corrugated sheet and the joint line of the lap portion; The transverse side edges of the corrugated sheet are welded and fixed to the short side wall or the long side wall to form a transverse weld seam.

2. The oil tank structure for a three-dimensional wound core transformer according to claim 1, characterized by: The width of the overlap is 10-15 mm.

3. The oil tank structure for a three-dimensional wound core transformer according to claim 2, characterized by: The shortest distance between the transverse side edge of the corrugated sheet and the edge of the surface it is located is 70-90 mm, and the shortest distance between the longitudinal side edge of the corrugated sheet and the edge of the surface it is located is 70-90 mm.

4. The oil tank structure for a three-dimensional wound core transformer according to any one of claims 1 to 3, characterized by: The short sidewall and / or the long sidewall are U-shaped or L-shaped structures formed by bending, with folded portions for overlapping.

5. The oil tank structure for a three-dimensional wound core transformer according to claim 4, characterized by: The corrugated sheet is provided with reinforcing ribs at both the top and bottom, and the top reinforcing ribs and the bottom reinforcing ribs are arranged intersectingly.

6. The oil tank structure for a three-dimensional wound core transformer according to any one of claims 1 to 3, 5, characterized by: The lid and the side wall are connected by an overlapping joint, and a sealing gasket is provided at the overlapping joint.

7. The oil tank structure for a three-dimensional wound core transformer according to claim 6, characterized by: The short sidewall, the long sidewall, and the corrugated sheet all have welding bevels at the welding locations.

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